Oracle 维护SQL整理
2007-01-10 15:05
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IV) 性能相关内容
-----------------------------------------------------------------------
1、捕捉运行很久的SQL
column username format a12
column opname format a16
column progress format a8
SELECT Username, Sid, Opname,
Round(Sofar * 100 / Totalwork, 0) || '%' AS Progress, Time_Remaining,
Sql_Text
FROM V$session_Longops, V$sql
WHERE Time_Remaining <> 0
AND Sql_Address = Address
AND Sql_Hash_Value = Hash_Value;
-----------------------------------------------------------------------
2、求DISK READ较多的SQL
SELECT St.Sql_Text
FROM V$sql s, V$sqltext St
WHERE s.Address = St.Address
AND s.Hash_Value = St.Hash_Value
AND s.Disk_Reads > 300;
-----------------------------------------------------------------------
3、求DISK SORT严重的SQL
SELECT Sess.Username, SQL.Sql_Text, Sort1.Blocks
FROM V$session Sess, V$sqlarea SQL, V$sort_Usage Sort1
WHERE Sess.Serial# = Sort1.Session_Num
AND Sort1.Sqladdr = SQL.Address
AND Sort1.Sqlhash = SQL.Hash_Value
AND Sort1.Blocks > 200;
-----------------------------------------------------------------------
4、监控索引是否使用
alter index &index_name monitoring usage;
alter index &index_name nomonitoring usage;
select * from v$object_usage where index_name = &index_name;
-----------------------------------------------------------------------
5、求数据文件的I/O分布
SELECT Df.NAME, Phyrds, Phywrts, Phyblkrd, Phyblkwrt, Singleblkrds, Readtim,
Writetim
FROM V$filestat Fs, V$dbfile Df
WHERE Fs.File# = Df.File#
ORDER BY Df.NAME;
-----------------------------------------------------------------------
6、查看还没提交的事务
select * from v$locked_object;
select * from v$transaction;
-----------------------------------------------------------------------
7、回滚段查看
SELECT Rownum, Sys.Dba_Rollback_Segs.Segment_Name NAME,
V$rollstat.Extents Extents, V$rollstat.Rssize Size_In_Bytes,
V$rollstat.Xacts Xacts, V$rollstat.Gets Gets, V$rollstat.Waits Waits,
V$rollstat.Writes Writes, Sys.Dba_Rollback_Segs.Status Status
FROM V$rollstat, Sys.Dba_Rollback_Segs, V$rollname
WHERE V$rollname.NAME(+) = Sys.Dba_Rollback_Segs.Segment_Name
AND V$rollstat.Usn(+) = V$rollname.Usn
ORDER BY Rownum
-----------------------------------------------------------------------
8、查看系统请求情况
SELECT Decode(NAME, 'summed dirty write queue length', VALUE) /
Decode(NAME, 'write requests', VALUE) "Write Request Length"
FROM V$sysstat
WHERE NAME IN ('summed dirty queue length', 'write requests')
AND VALUE > 0;
-----------------------------------------------------------------------
9、计算data buffer 命中率
SELECT a.VALUE + b.VALUE "logical_reads", c.VALUE "phys_reads",
Round(100 * ((a.VALUE + b.VALUE) - c.VALUE) / (a.VALUE + b.VALUE)) "BUFFER HIT RATIO"
FROM V$sysstat a, V$sysstat b, V$sysstat c
WHERE a.Statistic# = 40
AND b.Statistic# = 41
AND c.Statistic# = 42;
SELECT NAME,
(1 - (Physical_Reads / (Db_Block_Gets + Consistent_Gets))) * 100 h_Ratio
FROM V$buffer_Pool_Statistics;
-----------------------------------------------------------------------
10、查看内存使用情况
SELECT Least(MAX(b.VALUE) / (1024 * 1024), SUM(a.Bytes) / (1024 * 1024)) Shared_Pool_Used,
MAX(b.VALUE) / (1024 * 1024) Shared_Pool_Size,
Greatest(MAX(b.VALUE) / (1024 * 1024), SUM(a.Bytes) / (1024 * 1024)) -
(SUM(a.Bytes) / (1024 * 1024)) Shared_Pool_Avail,
((SUM(a.Bytes) / (1024 * 1024)) / (MAX(b.VALUE) / (1024 * 1024))) * 100 Avail_Pool_Pct
FROM V$sgastat a, V$parameter b
WHERE (a.Pool = 'shared pool' AND a.NAME NOT IN ('free memory'))
AND b.NAME = 'shared_pool_size';
-----------------------------------------------------------------------
11、查看用户使用内存情况
SELECT Username, SUM(Sharable_Mem), SUM(Persistent_Mem), SUM(Runtime_Mem)
FROM Sys.v_$sqlarea a, Dba_Users b
WHERE a.Parsing_User_Id = b.User_Id
GROUP BY Username;
-----------------------------------------------------------------------
12、查看对象的缓存情况
SELECT Owner, Namespace, TYPE, NAME, Sharable_Mem, Loads, Executions, Locks,
Pins, Kept
FROM V$db_Object_Cache
WHERE TYPE NOT IN
('NOT LOADED', 'NON-EXISTENT', 'VIEW', 'TABLE', 'SEQUENCE')
AND Executions > 0
AND Loads > 1
AND Kept = 'NO'
ORDER BY Owner, Namespace, TYPE, Executions DESC;
SELECT TYPE, COUNT(*)
FROM V$db_Object_Cache
GROUP BY TYPE;
-----------------------------------------------------------------------
13、查看库缓存命中率
SELECT Namespace, Gets, Gethitratio * 100 Gethitratio, Pins,
Pinhitratio * 100 Pinhitratio, Reloads, Invalidations
FROM V$librarycache
-----------------------------------------------------------------------
14、查看某些用户的hash
SELECT a.Username, COUNT(b.Hash_Value) Total_Hash,
COUNT(b.Hash_Value) - COUNT(UNIQUE(b.Hash_Value)) Same_Hash,
(COUNT(UNIQUE(b.Hash_Value)) / COUNT(b.Hash_Value)) * 100 u_Hash_Ratio
FROM Dba_Users a, V$sqlarea b
WHERE a.User_Id = b.Parsing_User_Id
GROUP BY a.Username;
-----------------------------------------------------------------------
15、查看字典命中率
SELECT (SUM(Getmisses) / SUM(Gets)) Ratio
FROM V$rowcache;
-----------------------------------------------------------------------
16、查看undo段的使用情况
SELECT d.Segment_Name, Extents, Optsize, Shrinks, Aveshrink, Aveactive,
d.Status
FROM V$rollname n, V$rollstat s, Dba_Rollback_Segs d
WHERE d.Segment_Id = n.Usn(+)
AND d.Segment_Id = s.Usn(+);
-----------------------------------------------------------------------
17、求归档日志的切换频率(生产系统可能时间会很长)
SELECT Start_Recid, Start_Time, End_Recid, End_Time, Minutes
FROM (SELECT Test.*, Rownum AS Rn
FROM (SELECT b.Recid Start_Recid,
To_Char(b.First_Time, 'yyyy-mm-dd hh24:mi:ss') Start_Time,
a.Recid End_Recid,
To_Char(a.First_Time, 'yyyy-mm-dd hh24:mi:ss') End_Time,
Round(((a.First_Time - b.First_Time) * 24) * 60, 2) Minutes
FROM V$log_History a, V$log_History b
WHERE a.Recid = b.Recid + 1
AND b.First_Time > SYSDATE - 1
ORDER BY a.First_Time DESC) Test) y
WHERE y.Rn < 30
-----------------------------------------------------------------------
18、求回滚段正在处理的事务
SELECT a.NAME, b.Xacts, c.Sid, c.Serial#, d.Sql_Text
FROM V$rollname a, V$rollstat b, V$session c, V$sqltext d, V$transaction e
WHERE a.Usn = b.Usn
AND b.Usn = e.Xidusn
AND c.Taddr = e.Addr
AND c.Sql_Address = d.Address
AND c.Sql_Hash_Value = d.Hash_Value
ORDER BY a.NAME, c.Sid, d.Piece;
-----------------------------------------------------------------------
19、求某个事务的重做信息(bytes)
SELECT s.NAME, m.VALUE
FROM V$mystat m, V$statname s
WHERE m.Statistic# = s.Statistic#
AND s.NAME LIKE '%redo size%';
20、求cache中缓存超过其5%的对象
SELECT o.Owner, o.Object_Type, o.Object_Name, COUNT(b.Objd)
FROM V$bh b, Dba_Objects o
WHERE b.Objd = o.Object_Id
GROUP BY o.Owner, o.Object_Type, o.Object_Name
HAVING COUNT(b.Objd) > (SELECT To_Number(VALUE) * 0.05
FROM V$parameter
WHERE NAME = 'db_block_buffers');
21、求buffer cache中的块信息
SELECT o.Object_Type, Substr(o.Object_Name, 1, 10) Objname, b.Objd, b.Status,
COUNT(b.Objd)
FROM V$bh b, Dba_Objects o
WHERE b.Objd = o.Data_Object_Id
AND o.Owner = '&owner'
GROUP BY o.Object_Type, o.Object_Name, b.Objd, b.Status;
22、求日志文件的空间使用
SELECT Le.Leseq Current_Log_Sequence#,
100 * Cp.Cpodr_Bno / Le.Lesiz Percentage_Full
FROM X$kcccp Cp, X$kccle Le
WHERE Le.Leseq = Cp.Cpodr_Seq;
23、求等待中的对象
SELECT /*+rule */
s.Sid, s.Username, w.Event, o.Owner, o.Segment_Name, o.Segment_Type,
o.Partition_Name, w.Seconds_In_Wait Seconds, w.State
FROM V$session_Wait w, V$session s, Dba_Extents o
WHERE w.Event IN (SELECT NAME
10e2d
FROM V$event_Name
WHERE Parameter1 = 'file#'
AND Parameter2 = 'block#'
AND NAME NOT LIKE 'control%')
AND o.Owner <> 'sys'
AND w.Sid = s.Sid
AND w.P1 = o.File_Id
AND w.P2 >= o.Block_Id
AND w.P2 < o.Block_Id + o.Blocks
24、求当前事务的重做尺寸
SELECT V$statname.NAME,VALUE
FROM V$mystat, V$statname
WHERE V$mystat.Statistic# = V$statname.Statistic#
AND V$statname.NAME = 'redo size';
25、唤醒smon去清除临时段
column pid new_value Smon
set termout off
SELECT p.Pid
FROM Sys.v_$bgprocess b, Sys.v_$process p
WHERE b.NAME = 'SMON'
AND p.Addr = b.Paddr;
/
SET Termout ON Oradebug Wakeup &Smon Undefine Smon
26、求回退率
SELECT b.VALUE / (a.VALUE + b.VALUE), a.VALUE, b.VALUE
FROM V$sysstat a, V$sysstat b
WHERE a.Statistic# = 4
AND b.Statistic# = 5;
27、求free memory
SELECT *
FROM V$sgastat
WHERE NAME = 'free memory';
SELECT a.NAME, SUM(b.VALUE)
FROM V$statname a, V$sesstat b
WHERE a.Statistic# = b.Statistic#
GROUP BY a.NAME;
查看一下谁在使用那个可以得回滚段，或者查看一下某个可以得用户在使用回滚段，
找出领回滚段不断增长的事务，再看看如何处理它，是否可以将它commit，再不行
就看看能否kill它，等等, 查看当前正在使用的回滚段的用户信息和回滚段信息:
set linesize 121
SELECT r.NAME "ROLLBACK SEGMENT NAME ", l.Sid "ORACLE PID",
p.Spid "SYSTEM PID ", s.Username "ORACLE USERNAME"
FROM V$lock l, V$process p, V$rollname r, V$session s
WHERE l.Sid = p.Pid(+)
AND s.Sid = l.Sid
AND Trunc(l.Id1(+) / 65536) = r.Usn
AND l.TYPE(+) = 'TX'
AND l.Lmode(+) = 6
ORDER BY r.NAME;
28、查看用户的回滚段的信息
SELECT s.Username, Rn.NAME
FROM V$session s, V$transaction t, V$rollstat r, V$rollname Rn
WHERE s.Saddr = t.Ses_Addr
AND t.Xidusn = r.Usn
AND r.Usn = Rn.Usn
29、查看内存中存的使用
SELECT Decode(Greatest(CLASS, 10),
10,
Decode(CLASS, 1, 'Data', 2, 'Sort', 4, 'Header', To_Char(CLASS)), 'Rollback') "Class",
SUM(Decode(Bitand(Flag, 1), 1, 0, 1)) "Not Dirty",
SUM(Decode(Bitand(Flag, 1), 1, 1, 0)) "Dirty",
SUM(Dirty_Queue) "On Dirty", COUNT(*) "Total"
FROM X$bh
GROUP BY Decode(Greatest(CLASS, 10),
10,
Decode(CLASS, 1, 'Data', 2, 'Sort', 4, 'Header', To_Char(CLASS)), 'Rollback');
发表于 @ 2006年12月31日 17:32:00 | 评论 (0)
『管理调优』Oracle维护常用SQL语句整理三
III) 进程相关内容
-----------------------------------------------------------------------
1、 求当前会话的SID，SERIAL#
SELECT Sid, Serial#
FROM V$session
WHERE Audsid = Sys_Context('USERENV', 'SESSIONID');
-----------------------------------------------------------------------
2、 查询session的OS进程ID
SELECT p.Spid "OS Thread", b.NAME "Name-User", s.Program, s.Sid, s.Serial#,
s.Osuser, s.Machine
FROM V$process p, V$session s, V$bgprocess b
WHERE p.Addr = s.Paddr
AND p.Addr = b.Paddr
And (s.sid=&1 or p.spid=&1)
UNION ALL
SELECT p.Spid "OS Thread", s.Username "Name-User", s.Program, s.Sid,
s.Serial#, s.Osuser, s.Machine
FROM V$process p, V$session s
WHERE p.Addr = s.Paddr
And (s.sid=&1 or p.spid=&1)
AND s.Username IS NOT NULL;
-----------------------------------------------------------------------
3、 根据sid查看对应连接正在运行的sql
SELECT /*+ PUSH_SUBQ */
Command_Type, Sql_Text, Sharable_Mem, Persistent_Mem, Runtime_Mem, Sorts,
Version_Count, Loaded_Versions, Open_Versions, Users_Opening, Executions,
Users_Executing, Loads, First_Load_Time, Invalidations, Parse_Calls,
Disk_Reads, Buffer_Gets, Rows_Processed, SYSDATE Start_Time,
SYSDATE Finish_Time, '>' || Address Sql_Address, 'N' Status
FROM V$sqlarea
WHERE Address = (SELECT Sql_Address
FROM V$session
WHERE Sid = &sid );
-----------------------------------------------------------------------
4、查找object为哪些进程所用
SELECT p.Spid, s.Sid, s.Serial# Serial_Num, s.Username User_Name,
a.TYPE Object_Type, s.Osuser Os_User_Name, a.Owner,
a.OBJECT Object_Name,
Decode(Sign(48 - Command), 1, To_Char(Command), 'Action Code #' || To_Char(Command)) Action,
p.Program Oracle_Process, s.Terminal Terminal, s.Program Program,
s.Status Session_Status
FROM V$session s, V$access a, V$process p
WHERE s.Paddr = p.Addr
AND s.TYPE = 'USER'
AND a.Sid = s.Sid
AND a.OBJECT = '&obj'
ORDER BY s.Username, s.Osuser
-----------------------------------------------------------------------
5、查看有哪些用户连接
SELECT s.Osuser Os_User_Name,
Decode(Sign(48 - Command),1,To_Char(Command),
'Action Code #' || To_Char(Command)) Action,
p.Program Oracle_Process, Status Session_Status, s.Terminal Terminal,
s.Program Program, s.Username User_Name,
s.Fixed_Table_Sequence Activity_Meter, '' Query, 0 Memory,
0 Max_Memory, 0 Cpu_Usage, s.Sid, s.Serial# Serial_Num
FROM V$session s, V$process p
WHERE s.Paddr = p.Addr
AND s.TYPE = 'USER'
ORDER BY s.Username, s.Osuser
6、根据v.sid查看对应连接的资源占用等情况
SELECT n.NAME, v.VALUE, n.CLASS, n.Statistic#
FROM V$statname n, V$sesstat v
WHERE v.Sid = &sid
AND v.Statistic# = n.Statistic#
ORDER BY n.CLASS, n.Statistic#
-----------------------------------------------------------------------
7、查询耗资源的进程（top session）
SELECT s.Schemaname Schema_Name,
Decode(Sign(48 - Command),
1, To_Char(Command), 'Action Code #' || To_Char(Command)) Action,
Status Session_Status, s.Osuser Os_User_Name, s.Sid, p.Spid,
s.Serial# Serial_Num, Nvl(s.Username, '[Oracle process]') User_Name,
s.Terminal Terminal, s.Program Program, St.VALUE Criteria_Value
FROM V$sesstat St, V$session s, V$process p
WHERE St.Sid = s.Sid
AND St.Statistic# = To_Number('38')
AND ('ALL' = 'ALL' OR s.Status = 'ALL')
AND p.Addr = s.Paddr
ORDER BY St.VALUE DESC, p.Spid ASC, s.Username ASC, s.Osuser ASC
-----------------------------------------------------------------------
8、查看锁（lock）情况
SELECT /*+ RULE */
Ls.Osuser Os_User_Name, Ls.Username User_Name,
Decode(Ls.TYPE,
'RW', 'Row wait enqueue lock', 'TM', 'DML enqueue lock',
'TX', 'Transaction enqueue lock', 'UL', 'User supplied lock') Lock_Type,
o.Object_Name OBJECT,
Decode(Ls.Lmode,
1, NULL, 2, 'Row Share', 3, 'Row Exclusive',
4, 'Share', 5, 'Share Row Exclusive', 6, 'Exclusive',
NULL) Lock_Mode,
o.Owner, Ls.Sid, Ls.Serial# Serial_Num, Ls.Id1, Ls.Id2
FROM Sys.Dba_Objects o,
(SELECT s.Osuser, s.Username, l.TYPE, l.Lmode, s.Sid, s.Serial#, l.Id1,
l.Id2
FROM V$session s, V$lock l
WHERE s.Sid = l.Sid) Ls
WHERE o.Object_Id = Ls.Id1
AND o.Owner <> 'SYS'
ORDER BY o.Owner, o.Object_Name
-----------------------------------------------------------------------
9、查看等待（wait）情况
SELECT Ws.CLASS, Ws.COUNT COUNT, SUM(Ss.VALUE) Sum_Value
FROM V$waitstat Ws, V$sysstat Ss
WHERE Ss.NAME IN ('db block gets', 'consistent gets')
GROUP BY Ws.CLASS, Ws.COUNT
-----------------------------------------------------------------------
10、求process/session的状态
SELECT p.Pid, p.Spid, s.Program, s.Sid, s.Serial#
FROM V$process p, V$session s
WHERE s.Paddr = p.Addr;
-----------------------------------------------------------------------
11、求谁阻塞了某个session(10g)
SELECT Sid, Username, Event, Blocking_Session, Seconds_In_Wait, Wait_Time
FROM V$session
WHERE State IN ('WAITING')
AND Wait_Class != 'Idle';
-----------------------------------------------------------------------
12、查会话的阻塞
col user_name format a32
SELECT /*+ rule */
Lpad(' ', Decode(l.Xidusn, 0, 3, 0)) || l.Oracle_Username User_Name,
o.Owner, o.Object_Name, s.Sid, s.Serial#
FROM V$locked_Object l, Dba_Objects o, V$session s
WHERE l.Object_Id = o.Object_Id
AND l.Session_Id = s.Sid
ORDER BY o.Object_Id, Xidusn DESC;
col username format a15
col lock_level format a8
col owner format a18
col object_name format a32
SELECT /*+ rule */
s.Username,
Decode(l.TYPE, 'tm', 'table lock', 'tx', 'row lock', NULL) Lock_Level,
o.Owner, o.Object_Name, s.Sid, s.Serial#
FROM V$session s, V$lock l, Dba_Objects o
WHERE l.Sid = s.Sid
AND l.Id1 = o.Object_Id(+)
AND s.Username IS NOT NULL;
-----------------------------------------------------------------------
13、求等待的事件及会话信息/求会话的等待及会话信息
SELECT Se.Sid, s.Username, Se.Event, Se.Total_Waits, Se.Time_Waited,
Se.Average_Wait
FROM V$session s, V$session_Event Se
WHERE s.Username IS NOT NULL
AND Se.Sid = s.Sid
AND s.Status = 'ACTIVE'
AND Se.Event NOT LIKE '%SQL*Net%'
ORDER BY s.Username;
SELECT s.Sid, s.Username, Sw.Event, Sw.Wait_Time, Sw.State,
Sw.Seconds_In_Wait
FROM V$session s, V$session_Wait Sw
WHERE s.Username IS NOT NULL
AND Sw.Sid = s.Sid
AND Sw.Event NOT LIKE '%SQL*Net%'
ORDER BY s.Username;
-----------------------------------------------------------------------
14、求会话等待的file_id/block_id
col event format a24
col p1text format a12
col p2text format a12
col p3text format a12
SELECT Sid, Event, P1text, P1, P2text, P2, P3text, P3
FROM V$session_Wait
WHERE Event NOT LIKE '%SQL%'
AND Event NOT LIKE '%rdbms%'
AND Event NOT LIKE '%mon%'
ORDER BY Event;
SELECT NAME, Wait_Time
FROM V$latch l
WHERE EXISTS (SELECT 1
FROM (SELECT Sid, Event, P1text, P1, P2text, P2, P3text, P3
FROM V$session_Wait
WHERE Event NOT LIKE '%SQL%'
AND Event NOT LIKE '%rdbms%'
AND Event NOT LIKE '%mon%') x
WHERE x.P1 = l.Latch#);
-----------------------------------------------------------------------
15、求会话等待的对象
col owner format a18
col segment_name format a32
col segment_type format a32
SELECT Owner, Segment_Name, Segment_Type
FROM Dba_Extents
WHERE File_Id = &File_Id
AND &Block_Id BETWEEN Block_Id AND Block_Id + Blocks - 1;
-----------------------------------------------------------------------
16、求出某个进程，并对它进行跟踪
SELECT s.Sid, s.Serial#
FROM V$session s, V$process p
WHERE s.Paddr = p.Addr
AND p.Spid = &1;
Exec Dbms_System.Set_Sql_Trace_In_Session(&1, &2, TRUE);
Exec Dbms_System.Set_Sql_Trace_In_Session(&1, &2, FALSE);
-----------------------------------------------------------------------
17、求当前session的跟踪文件
SELECT P1.VALUE || '/' || P2.VALUE || '_ora_' || p.Spid || '.ora' Filename
FROM V$process p, V$session s, V$parameter P1, V$parameter P2
WHERE P1.NAME = 'user_dump_dest'
AND P2.NAME = 'instance_name'
AND p.Addr = s.Paddr
AND s.Audsid = Userenv('SESSIONID')
AND p.Background IS NULL
AND Instr(p.Program, 'CJQ') = 0;
-----------------------------------------------------------------------
18、求出锁定的对象
SELECT Do.Object_Name, Session_Id, Process, Locked_Mode
FROM V$locked_Object Lo, Dba_Objects Do
WHERE Lo.Object_Id = Do.Object_Id;
-----------------------------------------------------------------------
发表于 @ 2006年12月31日 17:30:00 | 评论 (0)
『管理调优』Oracle维护常用SQL语句整理二
II) 空间状态相关内容
-----------------------------------------------------------------------
1、查看表空间的名称及大小
SELECT t.Tablespace_Name, Round(SUM(Bytes / (1024 * 1024)), 0) Ts_Size
FROM Dba_Tablespaces t, Dba_Data_Files d
WHERE t.Tablespace_Name = d.Tablespace_Name
GROUP BY t.Tablespace_Name;
-----------------------------------------------------------------------
2、查看表空间物理文件的名称及大小
SELECT Tablespace_Name, File_Id, File_Name,
Round(Bytes / (1024 * 1024), 0) Total_Space
FROM Dba_Data_Files
ORDER BY Tablespace_Name;
-----------------------------------------------------------------------
3、求表空间的未用空间
col mbytes format 9999.9999
SELECT Tablespace_Name, SUM(Bytes) / 1024 / 1024 Mbytes
FROM Dba_Free_Space
GROUP BY Tablespace_Name;
-----------------------------------------------------------------------
4、察看数据库的大小，和空间使用情况
SELECT SUM(Bytes) / (1024 * 1024) AS Free_Space, Tablespace_Name
FROM Dba_Free_Space
GROUP BY Tablespace_Name;
SELECT a.Tablespace_Name, a.Bytes Total, b.Bytes Used, c.Bytes Free,
(b.Bytes * 100) / a.Bytes "% USED",
(c.Bytes * 100) / a.Bytes "% FREE"
FROM Sys.Sm$ts_Avail a, Sys.Sm$ts_Used b, Sys.Sm$ts_Free c
WHERE a.Tablespace_Name = b.Tablespace_Name
AND a.Tablespace_Name = c.Tablespace_Name;
-----------------------------------------------------------------------
5、查看表空间的文件使用情况
SELECT b.File_Id 文件id, b.Tablespace_Name 表空间, b.File_Name 物理文件名,
b.Bytes 总字节数, (b.Bytes - SUM(Nvl(a.Bytes, 0))) 已使用,
SUM(Nvl(a.Bytes, 0)) 剩余,
SUM(Nvl(a.Bytes, 0)) / (b.Bytes) * 100 剩余百分比
FROM Dba_Free_Space a,
Dba_Data_Files b where a.File_Id = b.File_Id group BY b.Tablespace_Name,
b.File_Name, b.File_Id, b.Bytes order BY b.Tablespace_Name
--/ dba_Free_Space --表空间剩余空间状况
-- dba_Data_Files --数据文件空间占用情况
-----------------------------------------------------------------------
6、 查询表空间的碎片程度
SELECT Tablespace_Name, COUNT(Tablespace_Name)
FROM Dba_Free_Space
GROUP BY Tablespace_Name
HAVING COUNT(Tablespace_Name) > 10;
alter tablespace name coalesce;
alter table name deallocate unused;
create or replace view ts_blocks_v as
SELECT Tablespace_Name, Block_Id, Bytes, Blocks, 'free space' Segment_Name
FROM Dba_Free_Space
UNION ALL
SELECT Tablespace_Name, Block_Id, Bytes, Blocks, Segment_Name
FROM Dba_Extents;
select * from ts_blocks_v;
SELECT Tablespace_Name, SUM(Bytes), MAX(Bytes), COUNT(Block_Id)
FROM Dba_Free_Space
GROUP BY Tablespace_Name;
-----------------------------------------------------------------------
发表于 @ 2006年12月31日 17:29:00 | 评论 (0)
『管理调优』Oracle维护常用SQL语句整理一
摘要：I) 数据库对象相关内容,持续更新 （全文共11648字）——点击此处阅读全文
发表于 @ 2006年12月31日 17:00:00 | 评论 (0)
『锁和进程』：Oracle的死锁
[Q]： 怎么查询Oracle的死锁？
[A]： Oracle会自动捕获死锁，不用去干预。但可能会出现锁长时间不能释放的问题。
可以用如下语句查下：
SELECT *
FROM V$lock
WHERE Sid IN (SELECT l.Sid
FROM V$lock l,
(SELECT Id1, Id2, Sid
FROM V$lock
WHERE BLOCK = 1) Blocker
WHERE l.Id1 = Blocker.Id1
AND l.Id2 = Blocker.Id2);
其中：block＝1为的是锁始发者。
sid和session的sid关联。
关闭block=1的会话即可
/****************************************************************************/
[Q]： 怎么快速查找锁与锁等待？
[A]： 数据库的锁是比较耗费资源的，特别是发生锁等待的时候，我们必须找到发生等待的锁，
有可能的话，杀掉该进程。
下面这个语句将查找到数据库中所有的DML语句产生的锁，还可以发现，任何DML语句
其实产生了两个锁，一个是表锁，一个是行锁。
SELECT /*+ rule */
s.Username,
Decode(l.TYPE, 'TM', 'TABLE LOCK', 'TX', 'ROW LOCK', NULL) Lock_Level,
o.Owner, o.Object_Name, o.Object_Type, s.Sid, s.Serial#, s.Terminal,
s.Machine, s.Program, s.Osuser
FROM V$session s, V$lock l, Dba_Objects o
WHERE l.Sid = s.Sid
AND l.Id1 = o.Object_Id(+)
AND s.Username IS NOT NULL
如果发生了锁等待，我们可能更想知道是谁锁了表而引起谁的等待
以下的语句可以查询到谁锁了表，而谁在等待。
SELECT /*+ rule */
Lpad(' ', Decode(l.Xidusn, 0, 3, 0)) || l.Oracle_Username User_Name,
o.Owner, o.Object_Name, o.Object_Type, s.Sid, s.Serial#
FROM V$locked_Object l, Dba_Objects o, V$session s
WHERE l.Object_Id = o.Object_Id
AND l.Session_Id = s.Sid
ORDER BY o.Object_Id, Xidusn DESC
以上查询结果是一个树状结构，如果有子节点，则表示有等待发生。
如果想知道锁用了哪个回滚段，还可以关联到V$rollname，其中xidusn就是回滚段的USN
/********************************************************************************************/
1、查看表空间的名称及大小
select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
2、查看表空间物理文件的名称及大小
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
3、查看回滚段名称及大小
select segment_name, tablespace_name, r.status,
(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,
max_extents, v.curext CurExtent
From dba_rollback_segs r, v$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name ;
4、查看控制文件
select name from v$controlfile;
5、查看日志文件
select member from v$logfile;
6、查看表空间的使用情况
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;
7、查看数据库库对象
select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
8、查看数据库的版本
Select version FROM Product_component_version
Where SUBSTR(PRODUCT,1,6)=’Oracle’;
9、查看数据库的创建日期和归档方式
Select Created, Log_Mode, Log_Mode From V$Database;
10、捕捉运行很久的SQL
column username format a12
column opname format a16
column progress format a8
select username,sid,opname,
round(sofar*100 / totalwork,0) || ’%’ as progress,
time_remaining,sql_text
from v$session_longops , v$sql
where time_remaining <> 0
and sql_address = address
and sql_hash_value = hash_value
/
11、查看数据表的参数信息
SELECT partition_name, high_value, high_value_length, tablespace_name,
pct_free, pct_used, ini_trans, max_trans, initial_extent,
next_extent, min_extent, max_extent, pct_increase, FREELISTS,
freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,
empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
last_analyzed
FROM dba_tab_partitions
--WHERE table_name = :tname AND table_owner = :towner
ORDER BY partition_position
12、查看还没提交的事务
select * from v$locked_object;
select * from v$transaction;
13、查找object为哪些进程所用
select
p.spid,
s.sid,
s.serial# serial_num,
s.username user_name,
a.type object_type,
s.osuser os_user_name,
a.owner,
a.object object_name,
decode(sign(48 - command),
1,
to_char(command), ’Action Code #’ || to_char(command) ) action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status
from v$session s, v$access a, v$process p
where s.paddr = p.addr and
s.type = ’USER’ and
a.sid = s.sid and
a.object=’SUBSCRIBER_ATTR’
order by s.username, s.osuser
14、回滚段查看
select rownum, sys.dba_rollback_segs.segment_name Name, v$rollstat.extents
Extents, v$rollstat.rssize Size_in_Bytes, v$rollstat.xacts XActs,
v$rollstat.gets Gets, v$rollstat.waits Waits, v$rollstat.writes Writes,
sys.dba_rollback_segs.status status from v$rollstat, sys.dba_rollback_segs,
v$rollname where v$rollname.name(+) = sys.dba_rollback_segs.segment_name and
v$rollstat.usn (+) = v$rollname.usn order by rownum
15、耗资源的进程(top session)
select s.schemaname schema_name, decode(sign(48 - command), 1,
to_char(command), ’Action Code #’ || to_char(command) ) action, status
session_status, s.osuser os_user_name, s.sid, p.spid , s.serial# serial_num,
nvl(s.username, ’[Oracle process]’) user_name, s.terminal terminal,
s.program program, st.value criteria_value from v$sesstat st, v$session s , v$process p
where st.sid = s.sid and st.statistic# = to_number(’38’) and (’ALL’ = ’ALL’
or s.status = ’ALL’) and p.addr = s.paddr order by st.value desc, p.spid asc, s.username asc, s.osuser asc
16、查看锁(lock)情况
select /*+ RULE */ ls.osuser os_user_name, ls.username user_name,
decode(ls.type, ’RW’, ’Row wait enqueue lock’, ’TM’, ’DML enqueue lock’, ’TX’,
’Transaction enqueue lock’, ’UL’, ’User supplied lock’) lock_type,
o.object_name object, decode(ls.lmode, 1, null, 2, ’Row Share’, 3,
’Row Exclusive’, 4, ’Share’, 5, ’Share Row Exclusive’, 6, ’Exclusive’, null)
lock_mode, o.owner, ls.sid, ls.serial# serial_num, ls.id1, ls.id2
from sys.dba_objects o, ( select s.osuser, s.username, l.type,
l.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s,
v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner
<> ’SYS’ order by o.owner, o.object_name
17、查看等待(wait)情况
SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value
FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN (’db block gets’,
’consistent gets’) group by v$waitstat.class, v$waitstat.count
18、查看sga情况
SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC
19、查看catched object
SELECT owner, name, db_link, namespace,
type, sharable_mem, loads, executions,
locks, pins, kept FROM v$db_object_cache
20、查看V$SQLAREA
SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,
VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,
USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS, DISK_READS,
BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA
21、查看object分类数量
select decode (o.type#,1,’INDEX’ , 2,’TABLE’ , 3 , ’CLUSTER’ , 4, ’VIEW’ , 5 ,
’SYNONYM’ , 6 , ’SEQUENCE’ , ’OTHER’ ) object_type , count(*) quantity from
sys.obj$ o where o.type# > 1 group by decode (o.type#,1,’INDEX’ , 2,’TABLE’ , 3
, ’CLUSTER’ , 4, ’VIEW’ , 5 , ’SYNONYM’ , 6 , ’SEQUENCE’ , ’OTHER’ ) union select
’COLUMN’ , count(*) from sys.col$ union select ’DB LINK’ , count(*) from
22、按用户查看object种类
select u.name schema, sum(decode(o.type#, 1, 1, NULL)) indexes,
sum(decode(o.type#, 2, 1, NULL)) tables, sum(decode(o.type#, 3, 1, NULL))
clusters, sum(decode(o.type#, 4, 1, NULL)) views, sum(decode(o.type#, 5, 1,
NULL)) synonyms, sum(decode(o.type#, 6, 1, NULL)) sequences,
sum(decode(o.type#, 1, NULL, 2, NULL, 3, NULL, 4, NULL, 5, NULL, 6, NULL, 1))
others from sys.obj$ o, sys.user$ u where o.type# >= 1 and u.user# =
o.owner# and u.name <> ’PUBLIC’ group by u.name order by
sys.link$ union select ’CONSTRAINT’ , count(*) from sys.con$
23、有关connection的相关信息
1)查看有哪些用户连接
select s.osuser os_user_name, decode(sign(48 - command), 1, to_char(command),
’Action Code #’ || to_char(command) ) action, p.program oracle_process,
status session_status, s.terminal terminal, s.program program,
s.username user_name, s.fixed_table_sequence activity_meter, ’’ query,
0 memory, 0 max_memory, 0 cpu_usage, s.sid, s.serial# serial_num
from v$session s, v$process p where s.paddr=p.addr and s.type = ’USER’
order by s.username, s.osuser
2)根据v.sid查看对应连接的资源占用等情况
select n.name,
v.value,
n.class,
n.statistic#
from v$statname n,
v$sesstat v
where v.sid = 71 and
v.statistic# = n.statistic#
order by n.class, n.statistic#
3)根据sid查看对应连接正在运行的sql
select /*+ PUSH_SUBQ */
command_type,
sql_text,
sharable_mem,
persistent_mem,
runtime_mem,
sorts,
version_count,
loaded_versions,
open_versions,
users_opening,
executions,
users_executing,
loads,
first_load_time,
invalidations,
parse_calls,
disk_reads,
buffer_gets,
rows_processed,
sysdate start_time,
sysdate finish_time,
’>’ || address sql_address,
’N’ status
from v$sqlarea
where address = (select sql_address from v$session where sid = 71)
24、查询表空间使用情况select a.tablespace_name "表空间名称",
100-round((nvl(b.bytes_free,0)/a.bytes_alloc)*100,2) "占用率(%)",
round(a.bytes_alloc/1024/1024,2) "容量(M)",
round(nvl(b.bytes_free,0)/1024/1024,2) "空闲(M)",
round((a.bytes_alloc-nvl(b.bytes_free,0))/1024/1024,2) "使用(M)",
Largest "最大扩展段(M)",
to_char(sysdate,’yyyy-mm-dd hh24:mi:ss’) "采样时间"
from (select f.tablespace_name,
sum(f.bytes) bytes_alloc,
sum(decode(f.autoextensible,’YES’,f.maxbytes,’NO’,f.bytes)) maxbytes
from dba_data_files f
group by tablespace_name) a,
(select f.tablespace_name,
sum(f.bytes) bytes_free
from dba_free_space f
group by tablespace_name) b,
(select round(max(ff.length)*16/1024,2) Largest,
ts.name tablespace_name
from sys.fet$ ff, sys.file$ tf,sys.ts$ ts
where ts.ts#=ff.ts# and ff.file#=tf.relfile# and ts.ts#=tf.ts#
group by ts.name, tf.blocks) c
where a.tablespace_name = b.tablespace_name and a.tablespace_name = c.tablespace_name
25、 查询表空间的碎片程度
select tablespace_name,count(tablespace_name) from dba_free_space group by tablespace_name
having count(tablespace_name)>10;
alter tablespace name coalesce;
alter table name deallocate unused;
create or replace view ts_blocks_v as
select tablespace_name,block_id,bytes,blocks,’free space’ segment_name from dba_free_space
union all
select tablespace_name,block_id,bytes,blocks,segment_name from dba_extents;
select * from ts_blocks_v;
select tablespace_name,sum(bytes),max(bytes),count(block_id) from dba_free_space
group by tablespace_name;
-----------------------------------------------------------------------
1、捕捉运行很久的SQL
column username format a12
column opname format a16
column progress format a8
SELECT Username, Sid, Opname,
Round(Sofar * 100 / Totalwork, 0) || '%' AS Progress, Time_Remaining,
Sql_Text
FROM V$session_Longops, V$sql
WHERE Time_Remaining <> 0
AND Sql_Address = Address
AND Sql_Hash_Value = Hash_Value;
-----------------------------------------------------------------------
2、求DISK READ较多的SQL
SELECT St.Sql_Text
FROM V$sql s, V$sqltext St
WHERE s.Address = St.Address
AND s.Hash_Value = St.Hash_Value
AND s.Disk_Reads > 300;
-----------------------------------------------------------------------
3、求DISK SORT严重的SQL
SELECT Sess.Username, SQL.Sql_Text, Sort1.Blocks
FROM V$session Sess, V$sqlarea SQL, V$sort_Usage Sort1
WHERE Sess.Serial# = Sort1.Session_Num
AND Sort1.Sqladdr = SQL.Address
AND Sort1.Sqlhash = SQL.Hash_Value
AND Sort1.Blocks > 200;
-----------------------------------------------------------------------
4、监控索引是否使用
alter index &index_name monitoring usage;
alter index &index_name nomonitoring usage;
select * from v$object_usage where index_name = &index_name;
-----------------------------------------------------------------------
5、求数据文件的I/O分布
SELECT Df.NAME, Phyrds, Phywrts, Phyblkrd, Phyblkwrt, Singleblkrds, Readtim,
Writetim
FROM V$filestat Fs, V$dbfile Df
WHERE Fs.File# = Df.File#
ORDER BY Df.NAME;
-----------------------------------------------------------------------
6、查看还没提交的事务
select * from v$locked_object;
select * from v$transaction;
-----------------------------------------------------------------------
7、回滚段查看
SELECT Rownum, Sys.Dba_Rollback_Segs.Segment_Name NAME,
V$rollstat.Extents Extents, V$rollstat.Rssize Size_In_Bytes,
V$rollstat.Xacts Xacts, V$rollstat.Gets Gets, V$rollstat.Waits Waits,
V$rollstat.Writes Writes, Sys.Dba_Rollback_Segs.Status Status
FROM V$rollstat, Sys.Dba_Rollback_Segs, V$rollname
WHERE V$rollname.NAME(+) = Sys.Dba_Rollback_Segs.Segment_Name
AND V$rollstat.Usn(+) = V$rollname.Usn
ORDER BY Rownum
-----------------------------------------------------------------------
8、查看系统请求情况
SELECT Decode(NAME, 'summed dirty write queue length', VALUE) /
Decode(NAME, 'write requests', VALUE) "Write Request Length"
FROM V$sysstat
WHERE NAME IN ('summed dirty queue length', 'write requests')
AND VALUE > 0;
-----------------------------------------------------------------------
9、计算data buffer 命中率
SELECT a.VALUE + b.VALUE "logical_reads", c.VALUE "phys_reads",
Round(100 * ((a.VALUE + b.VALUE) - c.VALUE) / (a.VALUE + b.VALUE)) "BUFFER HIT RATIO"
FROM V$sysstat a, V$sysstat b, V$sysstat c
WHERE a.Statistic# = 40
AND b.Statistic# = 41
AND c.Statistic# = 42;
SELECT NAME,
(1 - (Physical_Reads / (Db_Block_Gets + Consistent_Gets))) * 100 h_Ratio
FROM V$buffer_Pool_Statistics;
-----------------------------------------------------------------------
10、查看内存使用情况
SELECT Least(MAX(b.VALUE) / (1024 * 1024), SUM(a.Bytes) / (1024 * 1024)) Shared_Pool_Used,
MAX(b.VALUE) / (1024 * 1024) Shared_Pool_Size,
Greatest(MAX(b.VALUE) / (1024 * 1024), SUM(a.Bytes) / (1024 * 1024)) -
(SUM(a.Bytes) / (1024 * 1024)) Shared_Pool_Avail,
((SUM(a.Bytes) / (1024 * 1024)) / (MAX(b.VALUE) / (1024 * 1024))) * 100 Avail_Pool_Pct
FROM V$sgastat a, V$parameter b
WHERE (a.Pool = 'shared pool' AND a.NAME NOT IN ('free memory'))
AND b.NAME = 'shared_pool_size';
-----------------------------------------------------------------------
11、查看用户使用内存情况
SELECT Username, SUM(Sharable_Mem), SUM(Persistent_Mem), SUM(Runtime_Mem)
FROM Sys.v_$sqlarea a, Dba_Users b
WHERE a.Parsing_User_Id = b.User_Id
GROUP BY Username;
-----------------------------------------------------------------------
12、查看对象的缓存情况
SELECT Owner, Namespace, TYPE, NAME, Sharable_Mem, Loads, Executions, Locks,
Pins, Kept
FROM V$db_Object_Cache
WHERE TYPE NOT IN
('NOT LOADED', 'NON-EXISTENT', 'VIEW', 'TABLE', 'SEQUENCE')
AND Executions > 0
AND Loads > 1
AND Kept = 'NO'
ORDER BY Owner, Namespace, TYPE, Executions DESC;
SELECT TYPE, COUNT(*)
FROM V$db_Object_Cache
GROUP BY TYPE;
-----------------------------------------------------------------------
13、查看库缓存命中率
SELECT Namespace, Gets, Gethitratio * 100 Gethitratio, Pins,
Pinhitratio * 100 Pinhitratio, Reloads, Invalidations
FROM V$librarycache
-----------------------------------------------------------------------
14、查看某些用户的hash
SELECT a.Username, COUNT(b.Hash_Value) Total_Hash,
COUNT(b.Hash_Value) - COUNT(UNIQUE(b.Hash_Value)) Same_Hash,
(COUNT(UNIQUE(b.Hash_Value)) / COUNT(b.Hash_Value)) * 100 u_Hash_Ratio
FROM Dba_Users a, V$sqlarea b
WHERE a.User_Id = b.Parsing_User_Id
GROUP BY a.Username;
-----------------------------------------------------------------------
15、查看字典命中率
SELECT (SUM(Getmisses) / SUM(Gets)) Ratio
FROM V$rowcache;
-----------------------------------------------------------------------
16、查看undo段的使用情况
SELECT d.Segment_Name, Extents, Optsize, Shrinks, Aveshrink, Aveactive,
d.Status
FROM V$rollname n, V$rollstat s, Dba_Rollback_Segs d
WHERE d.Segment_Id = n.Usn(+)
AND d.Segment_Id = s.Usn(+);
-----------------------------------------------------------------------
17、求归档日志的切换频率(生产系统可能时间会很长)
SELECT Start_Recid, Start_Time, End_Recid, End_Time, Minutes
FROM (SELECT Test.*, Rownum AS Rn
FROM (SELECT b.Recid Start_Recid,
To_Char(b.First_Time, 'yyyy-mm-dd hh24:mi:ss') Start_Time,
a.Recid End_Recid,
To_Char(a.First_Time, 'yyyy-mm-dd hh24:mi:ss') End_Time,
Round(((a.First_Time - b.First_Time) * 24) * 60, 2) Minutes
FROM V$log_History a, V$log_History b
WHERE a.Recid = b.Recid + 1
AND b.First_Time > SYSDATE - 1
ORDER BY a.First_Time DESC) Test) y
WHERE y.Rn < 30
-----------------------------------------------------------------------
18、求回滚段正在处理的事务
SELECT a.NAME, b.Xacts, c.Sid, c.Serial#, d.Sql_Text
FROM V$rollname a, V$rollstat b, V$session c, V$sqltext d, V$transaction e
WHERE a.Usn = b.Usn
AND b.Usn = e.Xidusn
AND c.Taddr = e.Addr
AND c.Sql_Address = d.Address
AND c.Sql_Hash_Value = d.Hash_Value
ORDER BY a.NAME, c.Sid, d.Piece;
-----------------------------------------------------------------------
19、求某个事务的重做信息(bytes)
SELECT s.NAME, m.VALUE
FROM V$mystat m, V$statname s
WHERE m.Statistic# = s.Statistic#
AND s.NAME LIKE '%redo size%';
20、求cache中缓存超过其5%的对象
SELECT o.Owner, o.Object_Type, o.Object_Name, COUNT(b.Objd)
FROM V$bh b, Dba_Objects o
WHERE b.Objd = o.Object_Id
GROUP BY o.Owner, o.Object_Type, o.Object_Name
HAVING COUNT(b.Objd) > (SELECT To_Number(VALUE) * 0.05
FROM V$parameter
WHERE NAME = 'db_block_buffers');
21、求buffer cache中的块信息
SELECT o.Object_Type, Substr(o.Object_Name, 1, 10) Objname, b.Objd, b.Status,
COUNT(b.Objd)
FROM V$bh b, Dba_Objects o
WHERE b.Objd = o.Data_Object_Id
AND o.Owner = '&owner'
GROUP BY o.Object_Type, o.Object_Name, b.Objd, b.Status;
22、求日志文件的空间使用
SELECT Le.Leseq Current_Log_Sequence#,
100 * Cp.Cpodr_Bno / Le.Lesiz Percentage_Full
FROM X$kcccp Cp, X$kccle Le
WHERE Le.Leseq = Cp.Cpodr_Seq;
23、求等待中的对象
SELECT /*+rule */
s.Sid, s.Username, w.Event, o.Owner, o.Segment_Name, o.Segment_Type,
o.Partition_Name, w.Seconds_In_Wait Seconds, w.State
FROM V$session_Wait w, V$session s, Dba_Extents o
WHERE w.Event IN (SELECT NAME
10e2d
FROM V$event_Name
WHERE Parameter1 = 'file#'
AND Parameter2 = 'block#'
AND NAME NOT LIKE 'control%')
AND o.Owner <> 'sys'
AND w.Sid = s.Sid
AND w.P1 = o.File_Id
AND w.P2 >= o.Block_Id
AND w.P2 < o.Block_Id + o.Blocks
24、求当前事务的重做尺寸
SELECT V$statname.NAME,VALUE
FROM V$mystat, V$statname
WHERE V$mystat.Statistic# = V$statname.Statistic#
AND V$statname.NAME = 'redo size';
25、唤醒smon去清除临时段
column pid new_value Smon
set termout off
SELECT p.Pid
FROM Sys.v_$bgprocess b, Sys.v_$process p
WHERE b.NAME = 'SMON'
AND p.Addr = b.Paddr;
/
SET Termout ON Oradebug Wakeup &Smon Undefine Smon
26、求回退率
SELECT b.VALUE / (a.VALUE + b.VALUE), a.VALUE, b.VALUE
FROM V$sysstat a, V$sysstat b
WHERE a.Statistic# = 4
AND b.Statistic# = 5;
27、求free memory
SELECT *
FROM V$sgastat
WHERE NAME = 'free memory';
SELECT a.NAME, SUM(b.VALUE)
FROM V$statname a, V$sesstat b
WHERE a.Statistic# = b.Statistic#
GROUP BY a.NAME;
查看一下谁在使用那个可以得回滚段，或者查看一下某个可以得用户在使用回滚段，
找出领回滚段不断增长的事务，再看看如何处理它，是否可以将它commit，再不行
就看看能否kill它，等等, 查看当前正在使用的回滚段的用户信息和回滚段信息:
set linesize 121
SELECT r.NAME "ROLLBACK SEGMENT NAME ", l.Sid "ORACLE PID",
p.Spid "SYSTEM PID ", s.Username "ORACLE USERNAME"
FROM V$lock l, V$process p, V$rollname r, V$session s
WHERE l.Sid = p.Pid(+)
AND s.Sid = l.Sid
AND Trunc(l.Id1(+) / 65536) = r.Usn
AND l.TYPE(+) = 'TX'
AND l.Lmode(+) = 6
ORDER BY r.NAME;
28、查看用户的回滚段的信息
SELECT s.Username, Rn.NAME
FROM V$session s, V$transaction t, V$rollstat r, V$rollname Rn
WHERE s.Saddr = t.Ses_Addr
AND t.Xidusn = r.Usn
AND r.Usn = Rn.Usn
29、查看内存中存的使用
SELECT Decode(Greatest(CLASS, 10),
10,
Decode(CLASS, 1, 'Data', 2, 'Sort', 4, 'Header', To_Char(CLASS)), 'Rollback') "Class",
SUM(Decode(Bitand(Flag, 1), 1, 0, 1)) "Not Dirty",
SUM(Decode(Bitand(Flag, 1), 1, 1, 0)) "Dirty",
SUM(Dirty_Queue) "On Dirty", COUNT(*) "Total"
FROM X$bh
GROUP BY Decode(Greatest(CLASS, 10),
10,
Decode(CLASS, 1, 'Data', 2, 'Sort', 4, 'Header', To_Char(CLASS)), 'Rollback');
发表于 @ 2006年12月31日 17:32:00 | 评论 (0)
『管理调优』Oracle维护常用SQL语句整理三
III) 进程相关内容
-----------------------------------------------------------------------
1、 求当前会话的SID，SERIAL#
SELECT Sid, Serial#
FROM V$session
WHERE Audsid = Sys_Context('USERENV', 'SESSIONID');
-----------------------------------------------------------------------
2、 查询session的OS进程ID
SELECT p.Spid "OS Thread", b.NAME "Name-User", s.Program, s.Sid, s.Serial#,
s.Osuser, s.Machine
FROM V$process p, V$session s, V$bgprocess b
WHERE p.Addr = s.Paddr
AND p.Addr = b.Paddr
And (s.sid=&1 or p.spid=&1)
UNION ALL
SELECT p.Spid "OS Thread", s.Username "Name-User", s.Program, s.Sid,
s.Serial#, s.Osuser, s.Machine
FROM V$process p, V$session s
WHERE p.Addr = s.Paddr
And (s.sid=&1 or p.spid=&1)
AND s.Username IS NOT NULL;
-----------------------------------------------------------------------
3、 根据sid查看对应连接正在运行的sql
SELECT /*+ PUSH_SUBQ */
Command_Type, Sql_Text, Sharable_Mem, Persistent_Mem, Runtime_Mem, Sorts,
Version_Count, Loaded_Versions, Open_Versions, Users_Opening, Executions,
Users_Executing, Loads, First_Load_Time, Invalidations, Parse_Calls,
Disk_Reads, Buffer_Gets, Rows_Processed, SYSDATE Start_Time,
SYSDATE Finish_Time, '>' || Address Sql_Address, 'N' Status
FROM V$sqlarea
WHERE Address = (SELECT Sql_Address
FROM V$session
WHERE Sid = &sid );
-----------------------------------------------------------------------
4、查找object为哪些进程所用
SELECT p.Spid, s.Sid, s.Serial# Serial_Num, s.Username User_Name,
a.TYPE Object_Type, s.Osuser Os_User_Name, a.Owner,
a.OBJECT Object_Name,
Decode(Sign(48 - Command), 1, To_Char(Command), 'Action Code #' || To_Char(Command)) Action,
p.Program Oracle_Process, s.Terminal Terminal, s.Program Program,
s.Status Session_Status
FROM V$session s, V$access a, V$process p
WHERE s.Paddr = p.Addr
AND s.TYPE = 'USER'
AND a.Sid = s.Sid
AND a.OBJECT = '&obj'
ORDER BY s.Username, s.Osuser
-----------------------------------------------------------------------
5、查看有哪些用户连接
SELECT s.Osuser Os_User_Name,
Decode(Sign(48 - Command),1,To_Char(Command),
'Action Code #' || To_Char(Command)) Action,
p.Program Oracle_Process, Status Session_Status, s.Terminal Terminal,
s.Program Program, s.Username User_Name,
s.Fixed_Table_Sequence Activity_Meter, '' Query, 0 Memory,
0 Max_Memory, 0 Cpu_Usage, s.Sid, s.Serial# Serial_Num
FROM V$session s, V$process p
WHERE s.Paddr = p.Addr
AND s.TYPE = 'USER'
ORDER BY s.Username, s.Osuser
6、根据v.sid查看对应连接的资源占用等情况
SELECT n.NAME, v.VALUE, n.CLASS, n.Statistic#
FROM V$statname n, V$sesstat v
WHERE v.Sid = &sid
AND v.Statistic# = n.Statistic#
ORDER BY n.CLASS, n.Statistic#
-----------------------------------------------------------------------
7、查询耗资源的进程（top session）
SELECT s.Schemaname Schema_Name,
Decode(Sign(48 - Command),
1, To_Char(Command), 'Action Code #' || To_Char(Command)) Action,
Status Session_Status, s.Osuser Os_User_Name, s.Sid, p.Spid,
s.Serial# Serial_Num, Nvl(s.Username, '[Oracle process]') User_Name,
s.Terminal Terminal, s.Program Program, St.VALUE Criteria_Value
FROM V$sesstat St, V$session s, V$process p
WHERE St.Sid = s.Sid
AND St.Statistic# = To_Number('38')
AND ('ALL' = 'ALL' OR s.Status = 'ALL')
AND p.Addr = s.Paddr
ORDER BY St.VALUE DESC, p.Spid ASC, s.Username ASC, s.Osuser ASC
-----------------------------------------------------------------------
8、查看锁（lock）情况
SELECT /*+ RULE */
Ls.Osuser Os_User_Name, Ls.Username User_Name,
Decode(Ls.TYPE,
'RW', 'Row wait enqueue lock', 'TM', 'DML enqueue lock',
'TX', 'Transaction enqueue lock', 'UL', 'User supplied lock') Lock_Type,
o.Object_Name OBJECT,
Decode(Ls.Lmode,
1, NULL, 2, 'Row Share', 3, 'Row Exclusive',
4, 'Share', 5, 'Share Row Exclusive', 6, 'Exclusive',
NULL) Lock_Mode,
o.Owner, Ls.Sid, Ls.Serial# Serial_Num, Ls.Id1, Ls.Id2
FROM Sys.Dba_Objects o,
(SELECT s.Osuser, s.Username, l.TYPE, l.Lmode, s.Sid, s.Serial#, l.Id1,
l.Id2
FROM V$session s, V$lock l
WHERE s.Sid = l.Sid) Ls
WHERE o.Object_Id = Ls.Id1
AND o.Owner <> 'SYS'
ORDER BY o.Owner, o.Object_Name
-----------------------------------------------------------------------
9、查看等待（wait）情况
SELECT Ws.CLASS, Ws.COUNT COUNT, SUM(Ss.VALUE) Sum_Value
FROM V$waitstat Ws, V$sysstat Ss
WHERE Ss.NAME IN ('db block gets', 'consistent gets')
GROUP BY Ws.CLASS, Ws.COUNT
-----------------------------------------------------------------------
10、求process/session的状态
SELECT p.Pid, p.Spid, s.Program, s.Sid, s.Serial#
FROM V$process p, V$session s
WHERE s.Paddr = p.Addr;
-----------------------------------------------------------------------
11、求谁阻塞了某个session(10g)
SELECT Sid, Username, Event, Blocking_Session, Seconds_In_Wait, Wait_Time
FROM V$session
WHERE State IN ('WAITING')
AND Wait_Class != 'Idle';
-----------------------------------------------------------------------
12、查会话的阻塞
col user_name format a32
SELECT /*+ rule */
Lpad(' ', Decode(l.Xidusn, 0, 3, 0)) || l.Oracle_Username User_Name,
o.Owner, o.Object_Name, s.Sid, s.Serial#
FROM V$locked_Object l, Dba_Objects o, V$session s
WHERE l.Object_Id = o.Object_Id
AND l.Session_Id = s.Sid
ORDER BY o.Object_Id, Xidusn DESC;
col username format a15
col lock_level format a8
col owner format a18
col object_name format a32
SELECT /*+ rule */
s.Username,
Decode(l.TYPE, 'tm', 'table lock', 'tx', 'row lock', NULL) Lock_Level,
o.Owner, o.Object_Name, s.Sid, s.Serial#
FROM V$session s, V$lock l, Dba_Objects o
WHERE l.Sid = s.Sid
AND l.Id1 = o.Object_Id(+)
AND s.Username IS NOT NULL;
-----------------------------------------------------------------------
13、求等待的事件及会话信息/求会话的等待及会话信息
SELECT Se.Sid, s.Username, Se.Event, Se.Total_Waits, Se.Time_Waited,
Se.Average_Wait
FROM V$session s, V$session_Event Se
WHERE s.Username IS NOT NULL
AND Se.Sid = s.Sid
AND s.Status = 'ACTIVE'
AND Se.Event NOT LIKE '%SQL*Net%'
ORDER BY s.Username;
SELECT s.Sid, s.Username, Sw.Event, Sw.Wait_Time, Sw.State,
Sw.Seconds_In_Wait
FROM V$session s, V$session_Wait Sw
WHERE s.Username IS NOT NULL
AND Sw.Sid = s.Sid
AND Sw.Event NOT LIKE '%SQL*Net%'
ORDER BY s.Username;
-----------------------------------------------------------------------
14、求会话等待的file_id/block_id
col event format a24
col p1text format a12
col p2text format a12
col p3text format a12
SELECT Sid, Event, P1text, P1, P2text, P2, P3text, P3
FROM V$session_Wait
WHERE Event NOT LIKE '%SQL%'
AND Event NOT LIKE '%rdbms%'
AND Event NOT LIKE '%mon%'
ORDER BY Event;
SELECT NAME, Wait_Time
FROM V$latch l
WHERE EXISTS (SELECT 1
FROM (SELECT Sid, Event, P1text, P1, P2text, P2, P3text, P3
FROM V$session_Wait
WHERE Event NOT LIKE '%SQL%'
AND Event NOT LIKE '%rdbms%'
AND Event NOT LIKE '%mon%') x
WHERE x.P1 = l.Latch#);
-----------------------------------------------------------------------
15、求会话等待的对象
col owner format a18
col segment_name format a32
col segment_type format a32
SELECT Owner, Segment_Name, Segment_Type
FROM Dba_Extents
WHERE File_Id = &File_Id
AND &Block_Id BETWEEN Block_Id AND Block_Id + Blocks - 1;
-----------------------------------------------------------------------
16、求出某个进程，并对它进行跟踪
SELECT s.Sid, s.Serial#
FROM V$session s, V$process p
WHERE s.Paddr = p.Addr
AND p.Spid = &1;
Exec Dbms_System.Set_Sql_Trace_In_Session(&1, &2, TRUE);
Exec Dbms_System.Set_Sql_Trace_In_Session(&1, &2, FALSE);
-----------------------------------------------------------------------
17、求当前session的跟踪文件
SELECT P1.VALUE || '/' || P2.VALUE || '_ora_' || p.Spid || '.ora' Filename
FROM V$process p, V$session s, V$parameter P1, V$parameter P2
WHERE P1.NAME = 'user_dump_dest'
AND P2.NAME = 'instance_name'
AND p.Addr = s.Paddr
AND s.Audsid = Userenv('SESSIONID')
AND p.Background IS NULL
AND Instr(p.Program, 'CJQ') = 0;
-----------------------------------------------------------------------
18、求出锁定的对象
SELECT Do.Object_Name, Session_Id, Process, Locked_Mode
FROM V$locked_Object Lo, Dba_Objects Do
WHERE Lo.Object_Id = Do.Object_Id;
-----------------------------------------------------------------------
发表于 @ 2006年12月31日 17:30:00 | 评论 (0)
『管理调优』Oracle维护常用SQL语句整理二
II) 空间状态相关内容
-----------------------------------------------------------------------
1、查看表空间的名称及大小
SELECT t.Tablespace_Name, Round(SUM(Bytes / (1024 * 1024)), 0) Ts_Size
FROM Dba_Tablespaces t, Dba_Data_Files d
WHERE t.Tablespace_Name = d.Tablespace_Name
GROUP BY t.Tablespace_Name;
-----------------------------------------------------------------------
2、查看表空间物理文件的名称及大小
SELECT Tablespace_Name, File_Id, File_Name,
Round(Bytes / (1024 * 1024), 0) Total_Space
FROM Dba_Data_Files
ORDER BY Tablespace_Name;
-----------------------------------------------------------------------
3、求表空间的未用空间
col mbytes format 9999.9999
SELECT Tablespace_Name, SUM(Bytes) / 1024 / 1024 Mbytes
FROM Dba_Free_Space
GROUP BY Tablespace_Name;
-----------------------------------------------------------------------
4、察看数据库的大小，和空间使用情况
SELECT SUM(Bytes) / (1024 * 1024) AS Free_Space, Tablespace_Name
FROM Dba_Free_Space
GROUP BY Tablespace_Name;
SELECT a.Tablespace_Name, a.Bytes Total, b.Bytes Used, c.Bytes Free,
(b.Bytes * 100) / a.Bytes "% USED",
(c.Bytes * 100) / a.Bytes "% FREE"
FROM Sys.Sm$ts_Avail a, Sys.Sm$ts_Used b, Sys.Sm$ts_Free c
WHERE a.Tablespace_Name = b.Tablespace_Name
AND a.Tablespace_Name = c.Tablespace_Name;
-----------------------------------------------------------------------
5、查看表空间的文件使用情况
SELECT b.File_Id 文件id, b.Tablespace_Name 表空间, b.File_Name 物理文件名,
b.Bytes 总字节数, (b.Bytes - SUM(Nvl(a.Bytes, 0))) 已使用,
SUM(Nvl(a.Bytes, 0)) 剩余,
SUM(Nvl(a.Bytes, 0)) / (b.Bytes) * 100 剩余百分比
FROM Dba_Free_Space a,
Dba_Data_Files b where a.File_Id = b.File_Id group BY b.Tablespace_Name,
b.File_Name, b.File_Id, b.Bytes order BY b.Tablespace_Name
--/ dba_Free_Space --表空间剩余空间状况
-- dba_Data_Files --数据文件空间占用情况
-----------------------------------------------------------------------
6、 查询表空间的碎片程度
SELECT Tablespace_Name, COUNT(Tablespace_Name)
FROM Dba_Free_Space
GROUP BY Tablespace_Name
HAVING COUNT(Tablespace_Name) > 10;
alter tablespace name coalesce;
alter table name deallocate unused;
create or replace view ts_blocks_v as
SELECT Tablespace_Name, Block_Id, Bytes, Blocks, 'free space' Segment_Name
FROM Dba_Free_Space
UNION ALL
SELECT Tablespace_Name, Block_Id, Bytes, Blocks, Segment_Name
FROM Dba_Extents;
select * from ts_blocks_v;
SELECT Tablespace_Name, SUM(Bytes), MAX(Bytes), COUNT(Block_Id)
FROM Dba_Free_Space
GROUP BY Tablespace_Name;
-----------------------------------------------------------------------
发表于 @ 2006年12月31日 17:29:00 | 评论 (0)
『管理调优』Oracle维护常用SQL语句整理一
摘要：I) 数据库对象相关内容,持续更新 （全文共11648字）——点击此处阅读全文
发表于 @ 2006年12月31日 17:00:00 | 评论 (0)
『锁和进程』：Oracle的死锁
[Q]： 怎么查询Oracle的死锁？
[A]： Oracle会自动捕获死锁，不用去干预。但可能会出现锁长时间不能释放的问题。
可以用如下语句查下：
SELECT *
FROM V$lock
WHERE Sid IN (SELECT l.Sid
FROM V$lock l,
(SELECT Id1, Id2, Sid
FROM V$lock
WHERE BLOCK = 1) Blocker
WHERE l.Id1 = Blocker.Id1
AND l.Id2 = Blocker.Id2);
其中：block＝1为的是锁始发者。
sid和session的sid关联。
关闭block=1的会话即可
/****************************************************************************/
[Q]： 怎么快速查找锁与锁等待？
[A]： 数据库的锁是比较耗费资源的，特别是发生锁等待的时候，我们必须找到发生等待的锁，
有可能的话，杀掉该进程。
下面这个语句将查找到数据库中所有的DML语句产生的锁，还可以发现，任何DML语句
其实产生了两个锁，一个是表锁，一个是行锁。
SELECT /*+ rule */
s.Username,
Decode(l.TYPE, 'TM', 'TABLE LOCK', 'TX', 'ROW LOCK', NULL) Lock_Level,
o.Owner, o.Object_Name, o.Object_Type, s.Sid, s.Serial#, s.Terminal,
s.Machine, s.Program, s.Osuser
FROM V$session s, V$lock l, Dba_Objects o
WHERE l.Sid = s.Sid
AND l.Id1 = o.Object_Id(+)
AND s.Username IS NOT NULL
如果发生了锁等待，我们可能更想知道是谁锁了表而引起谁的等待
以下的语句可以查询到谁锁了表，而谁在等待。
SELECT /*+ rule */
Lpad(' ', Decode(l.Xidusn, 0, 3, 0)) || l.Oracle_Username User_Name,
o.Owner, o.Object_Name, o.Object_Type, s.Sid, s.Serial#
FROM V$locked_Object l, Dba_Objects o, V$session s
WHERE l.Object_Id = o.Object_Id
AND l.Session_Id = s.Sid
ORDER BY o.Object_Id, Xidusn DESC
以上查询结果是一个树状结构，如果有子节点，则表示有等待发生。
如果想知道锁用了哪个回滚段，还可以关联到V$rollname，其中xidusn就是回滚段的USN
/********************************************************************************************/
1、查看表空间的名称及大小
select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
2、查看表空间物理文件的名称及大小
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
3、查看回滚段名称及大小
select segment_name, tablespace_name, r.status,
(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,
max_extents, v.curext CurExtent
From dba_rollback_segs r, v$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name ;
4、查看控制文件
select name from v$controlfile;
5、查看日志文件
select member from v$logfile;
6、查看表空间的使用情况
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;
7、查看数据库库对象
select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
8、查看数据库的版本
Select version FROM Product_component_version
Where SUBSTR(PRODUCT,1,6)=’Oracle’;
9、查看数据库的创建日期和归档方式
Select Created, Log_Mode, Log_Mode From V$Database;
10、捕捉运行很久的SQL
column username format a12
column opname format a16
column progress format a8
select username,sid,opname,
round(sofar*100 / totalwork,0) || ’%’ as progress,
time_remaining,sql_text
from v$session_longops , v$sql
where time_remaining <> 0
and sql_address = address
and sql_hash_value = hash_value
/
11、查看数据表的参数信息
SELECT partition_name, high_value, high_value_length, tablespace_name,
pct_free, pct_used, ini_trans, max_trans, initial_extent,
next_extent, min_extent, max_extent, pct_increase, FREELISTS,
freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,
empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
last_analyzed
FROM dba_tab_partitions
--WHERE table_name = :tname AND table_owner = :towner
ORDER BY partition_position
12、查看还没提交的事务
select * from v$locked_object;
select * from v$transaction;
13、查找object为哪些进程所用
select
p.spid,
s.sid,
s.serial# serial_num,
s.username user_name,
a.type object_type,
s.osuser os_user_name,
a.owner,
a.object object_name,
decode(sign(48 - command),
1,
to_char(command), ’Action Code #’ || to_char(command) ) action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status
from v$session s, v$access a, v$process p
where s.paddr = p.addr and
s.type = ’USER’ and
a.sid = s.sid and
a.object=’SUBSCRIBER_ATTR’
order by s.username, s.osuser
14、回滚段查看
select rownum, sys.dba_rollback_segs.segment_name Name, v$rollstat.extents
Extents, v$rollstat.rssize Size_in_Bytes, v$rollstat.xacts XActs,
v$rollstat.gets Gets, v$rollstat.waits Waits, v$rollstat.writes Writes,
sys.dba_rollback_segs.status status from v$rollstat, sys.dba_rollback_segs,
v$rollname where v$rollname.name(+) = sys.dba_rollback_segs.segment_name and
v$rollstat.usn (+) = v$rollname.usn order by rownum
15、耗资源的进程(top session)
select s.schemaname schema_name, decode(sign(48 - command), 1,
to_char(command), ’Action Code #’ || to_char(command) ) action, status
session_status, s.osuser os_user_name, s.sid, p.spid , s.serial# serial_num,
nvl(s.username, ’[Oracle process]’) user_name, s.terminal terminal,
s.program program, st.value criteria_value from v$sesstat st, v$session s , v$process p
where st.sid = s.sid and st.statistic# = to_number(’38’) and (’ALL’ = ’ALL’
or s.status = ’ALL’) and p.addr = s.paddr order by st.value desc, p.spid asc, s.username asc, s.osuser asc
16、查看锁(lock)情况
select /*+ RULE */ ls.osuser os_user_name, ls.username user_name,
decode(ls.type, ’RW’, ’Row wait enqueue lock’, ’TM’, ’DML enqueue lock’, ’TX’,
’Transaction enqueue lock’, ’UL’, ’User supplied lock’) lock_type,
o.object_name object, decode(ls.lmode, 1, null, 2, ’Row Share’, 3,
’Row Exclusive’, 4, ’Share’, 5, ’Share Row Exclusive’, 6, ’Exclusive’, null)
lock_mode, o.owner, ls.sid, ls.serial# serial_num, ls.id1, ls.id2
from sys.dba_objects o, ( select s.osuser, s.username, l.type,
l.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s,
v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner
<> ’SYS’ order by o.owner, o.object_name
17、查看等待(wait)情况
SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value
FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN (’db block gets’,
’consistent gets’) group by v$waitstat.class, v$waitstat.count
18、查看sga情况
SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC
19、查看catched object
SELECT owner, name, db_link, namespace,
type, sharable_mem, loads, executions,
locks, pins, kept FROM v$db_object_cache
20、查看V$SQLAREA
SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,
VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,
USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS, DISK_READS,
BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA
21、查看object分类数量
select decode (o.type#,1,’INDEX’ , 2,’TABLE’ , 3 , ’CLUSTER’ , 4, ’VIEW’ , 5 ,
’SYNONYM’ , 6 , ’SEQUENCE’ , ’OTHER’ ) object_type , count(*) quantity from
sys.obj$ o where o.type# > 1 group by decode (o.type#,1,’INDEX’ , 2,’TABLE’ , 3
, ’CLUSTER’ , 4, ’VIEW’ , 5 , ’SYNONYM’ , 6 , ’SEQUENCE’ , ’OTHER’ ) union select
’COLUMN’ , count(*) from sys.col$ union select ’DB LINK’ , count(*) from
22、按用户查看object种类
select u.name schema, sum(decode(o.type#, 1, 1, NULL)) indexes,
sum(decode(o.type#, 2, 1, NULL)) tables, sum(decode(o.type#, 3, 1, NULL))
clusters, sum(decode(o.type#, 4, 1, NULL)) views, sum(decode(o.type#, 5, 1,
NULL)) synonyms, sum(decode(o.type#, 6, 1, NULL)) sequences,
sum(decode(o.type#, 1, NULL, 2, NULL, 3, NULL, 4, NULL, 5, NULL, 6, NULL, 1))
others from sys.obj$ o, sys.user$ u where o.type# >= 1 and u.user# =
o.owner# and u.name <> ’PUBLIC’ group by u.name order by
sys.link$ union select ’CONSTRAINT’ , count(*) from sys.con$
23、有关connection的相关信息
1)查看有哪些用户连接
select s.osuser os_user_name, decode(sign(48 - command), 1, to_char(command),
’Action Code #’ || to_char(command) ) action, p.program oracle_process,
status session_status, s.terminal terminal, s.program program,
s.username user_name, s.fixed_table_sequence activity_meter, ’’ query,
0 memory, 0 max_memory, 0 cpu_usage, s.sid, s.serial# serial_num
from v$session s, v$process p where s.paddr=p.addr and s.type = ’USER’
order by s.username, s.osuser
2)根据v.sid查看对应连接的资源占用等情况
select n.name,
v.value,
n.class,
n.statistic#
from v$statname n,
v$sesstat v
where v.sid = 71 and
v.statistic# = n.statistic#
order by n.class, n.statistic#
3)根据sid查看对应连接正在运行的sql
select /*+ PUSH_SUBQ */
command_type,
sql_text,
sharable_mem,
persistent_mem,
runtime_mem,
sorts,
version_count,
loaded_versions,
open_versions,
users_opening,
executions,
users_executing,
loads,
first_load_time,
invalidations,
parse_calls,
disk_reads,
buffer_gets,
rows_processed,
sysdate start_time,
sysdate finish_time,
’>’ || address sql_address,
’N’ status
from v$sqlarea
where address = (select sql_address from v$session where sid = 71)
24、查询表空间使用情况select a.tablespace_name "表空间名称",
100-round((nvl(b.bytes_free,0)/a.bytes_alloc)*100,2) "占用率(%)",
round(a.bytes_alloc/1024/1024,2) "容量(M)",
round(nvl(b.bytes_free,0)/1024/1024,2) "空闲(M)",
round((a.bytes_alloc-nvl(b.bytes_free,0))/1024/1024,2) "使用(M)",
Largest "最大扩展段(M)",
to_char(sysdate,’yyyy-mm-dd hh24:mi:ss’) "采样时间"
from (select f.tablespace_name,
sum(f.bytes) bytes_alloc,
sum(decode(f.autoextensible,’YES’,f.maxbytes,’NO’,f.bytes)) maxbytes
from dba_data_files f
group by tablespace_name) a,
(select f.tablespace_name,
sum(f.bytes) bytes_free
from dba_free_space f
group by tablespace_name) b,
(select round(max(ff.length)*16/1024,2) Largest,
ts.name tablespace_name
from sys.fet$ ff, sys.file$ tf,sys.ts$ ts
where ts.ts#=ff.ts# and ff.file#=tf.relfile# and ts.ts#=tf.ts#
group by ts.name, tf.blocks) c
where a.tablespace_name = b.tablespace_name and a.tablespace_name = c.tablespace_name
25、 查询表空间的碎片程度
select tablespace_name,count(tablespace_name) from dba_free_space group by tablespace_name
having count(tablespace_name)>10;
alter tablespace name coalesce;
alter table name deallocate unused;
create or replace view ts_blocks_v as
select tablespace_name,block_id,bytes,blocks,’free space’ segment_name from dba_free_space
union all
select tablespace_name,block_id,bytes,blocks,segment_name from dba_extents;
select * from ts_blocks_v;
select tablespace_name,sum(bytes),max(bytes),count(block_id) from dba_free_space
group by tablespace_name;
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