『管理调优』Oracle维护常用SQL语句整理三

III) 进程相关内容
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1、 求当前会话的SID，SERIAL#
SELECT Sid, Serial#
  FROM V$session
 WHERE Audsid = Sys_Context('USERENV', 'SESSIONID');
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2、 查询session的OS进程ID
SELECT p.Spid "OS Thread", b.NAME "Name-User", s.Program, s.Sid, s.Serial#,
       s.Osuser, s.Machine
  FROM V$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;
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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 );  
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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$process p
 WHERE s.Paddr = p.Addr
   AND s.TYPE = 'USER'
   AND a.Sid = s.Sid
   AND a.OBJECT = '&obj'
 ORDER BY s.Username, s.Osuser  
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5、查看有哪些用户连接
SELECT s.Osuser Os_User_Name,
       Decode(Sign(48 - Command),1,To_Char(Command),
               'Action Code #' || To_Char(Command)) Action,
       p.Program Oracle_Process, Status Session_Status, s.Terminal Terminal,
       s.Program Program, s.Username User_Name,
       s.Fixed_Table_Sequence Activity_Meter, '' Query, 0 Memory,
       0 Max_Memory, 0 Cpu_Usage, s.Sid, s.Serial# Serial_Num
  FROM V$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#  
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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$process p
 WHERE St.Sid = s.Sid
   AND St.Statistic# = To_Number('38')
   AND ('ALL' = 'ALL' OR s.Status = 'ALL')
   AND p.Addr = s.Paddr
 ORDER BY St.VALUE DESC, p.Spid ASC, s.Username ASC, s.Osuser ASC
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8、查看锁（lock）情况
SELECT /*+ RULE */
 Ls.Osuser Os_User_Name, Ls.Username User_Name,
 Decode(Ls.TYPE,
               'RW', 'Row wait enqueue lock', 'TM', 'DML enqueue lock',
               'TX', 'Transaction enqueue lock', 'UL',  'User supplied lock') Lock_Type,
 o.Object_Name OBJECT,
 Decode(Ls.Lmode,
         1, NULL,  2, 'Row Share', 3,  'Row Exclusive',
         4,  'Share', 5, 'Share Row Exclusive',  6, 'Exclusive',
         NULL) Lock_Mode,
 o.Owner, Ls.Sid, Ls.Serial# Serial_Num, Ls.Id1, Ls.Id2
  FROM Sys.Dba_Objects o,
       (SELECT s.Osuser, s.Username, l.TYPE, l.Lmode, s.Sid, s.Serial#, l.Id1,
                l.Id2
           FROM V$session s, V$lock l
          WHERE s.Sid = l.Sid) Ls
 WHERE o.Object_Id = Ls.Id1
   AND o.Owner <> 'SYS'
 ORDER BY o.Owner, o.Object_Name
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9、查看等待（wait）情况
SELECT Ws.CLASS, Ws.COUNT COUNT, SUM(Ss.VALUE) Sum_Value
  FROM V$waitstat Ws, V$sysstat Ss
 WHERE Ss.NAME IN ('db block gets', 'consistent gets')
 GROUP BY Ws.CLASS, Ws.COUNT
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10、求process/session的状态
SELECT p.Pid, p.Spid, s.Program, s.Sid, s.Serial#
  FROM V$process p, V$session s
 WHERE s.Paddr = p.Addr;
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11、求谁阻塞了某个session(10g)
SELECT Sid, Username, Event, Blocking_Session, Seconds_In_Wait, Wait_Time
  FROM V$session
 WHERE State IN ('WAITING')
   AND Wait_Class != 'Idle';
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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;
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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;
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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$session_Wait
                  WHERE Event NOT LIKE '%SQL%'
                    AND Event NOT LIKE '%rdbms%'
                    AND Event NOT LIKE '%mon%') x
         WHERE x.P1 = l.Latch#);
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15、求会话等待的对象
col owner format a18
col segment_name format a32
col segment_type format a32
SELECT Owner, Segment_Name, Segment_Type
  FROM Dba_Extents
 WHERE File_Id = &File_Id
   AND &Block_Id BETWEEN Block_Id AND Block_Id + Blocks - 1;
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16、求出某个进程，并对它进行跟踪
SELECT s.Sid, s.Serial#
  FROM V$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);
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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;
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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;
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