oracle 操作中常用语句

lvextend -L +40000m /dev/mapper/VolGroup00-LogVol04

ext2online /dev/mapper/VolGroup00-LogVol04

创建tablespace TS_BSWDB_DATA 用来存日志流水数据 （数据保留3年）
创建tablespace TS_BSWDB_INDEX 用来存日志流水数据索引 （数据保留3年）

创建tablespace TS_MGMDB 用来存静态数据（不会增长 1G 空间）

create user bswdb identified by bswdb default tablespace TS_BSWDB_DATA temporary tablespace temp;

create user mgmdb identified by mgmdb default tablespace TS_MGMDB temporary tablespace temp;

grant resource,connect to bswdb;

grant dba,resource,connect to mgmdb;

create tablespace TS_BSWDB_DATA datafile
'+DGORA/NBPREDB/DATAFILE/TS_BSWDB_DATA_01.dat' size 10g AUTOEXTEND OFF
EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;

create tablespace TS_BSWDB_INDEX datafile
'+DGORA/NBPREDB/DATAFILE/TS_BSWDB_INDEX_01.dat' size 5g AUTOEXTEND OFF
EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;

create tablespace TS_MGMDB datafile
'+DGORA/NBPREDB/DATAFILE/TS_MGMDB_01.dat' size 1g AUTOEXTEND OFF
EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;

查询oracle server端的字符集

有很多种方法可以查出oracle client端的字符集，比较直观的查询方法是以下这种:

SQL> select userenv('language') from dual;

SIMPLIFIED CHINESE_CHINA.AL32UTF8

如何查询dmp文件的字符集

用oracle的exp工具导出的dmp文件也包含了字符集信息，dmp文件的第2和第3个字节记录了dmp文件的字符集。如果dmp文件不大，比如只有几M或几十M，可以用UltraEdit打开(16进制方式)，看第2第3个字节的内容，如0354，然后用以下SQL查出它对应的字符集:

SQL> select nls_charset_name(to_number('0354','xxxx')) from dual;

export NLS_LANG=AMERICAN_AMERICA.ZHS16GBK

select * from dba_tablespaces;
select * from dba_data_files ;

#正在执行的sql语句
SELECT osuser, username, sql_text from v$session a, v$sqlarea b where a.sql_address =b.address order by address;

oracle查看锁表进程
oracle查看锁表进程，杀掉锁表进程
2008-10-22 16:01
查看锁表进程SQL语句1：
SELECT l.session_id sid,
s.serial#,
l.locked_mode ,
l.oracle_username ,
l.os_user_name ,
s.machine ,
s.terminal ,
o.object_name ,
s.logon_time
FROM v$locked_object l, all_objects o, v$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
ORDER BY sid, s.serial#;

查看锁表进程SQL语句2：
select * from v$session t1, v$locked_object t2 where t1.sid = t2.SESSION_ID;

杀掉锁表进程：
如有記錄則表示有lock，記錄下SID和serial# ，將記錄的ID替換下面的 80,33，即可解除LOCK
alter system kill session '158,306';

##查数据文件大小，缩小文件

select * from dba_data_files;

alter database datafile '/oracle/app/oracle/oradata/orcl/users01.dbf' resize 2G;

###更改临时表空间

ALTER DATABASE TEMPFILE '/oracle/app/oracle/oradata/orcl/temp01.dbf' DROP;

ALTER TABLESPACE TEMP ADD TEMPFILE '/oracle/app/oracle/oradata/orcl/temp01.dbf' SIZE 2G autoextend off;

ALTER TABLESPACE TS_NEW_DATA ADD DATAFILE '/app/oracle/oradata/ORCL/TS_NEW_DATA_03.dat' SIZE 10G autoextend off;

##### 查用户表哪个占得空间大
col tablespace format a20
select
　　b.tablespace_name　　表空间,
　　round(SUM(NVL(b.bytes,0))/1024/1024,2)　　　　 总容量M,
　　ROUND((SUM(NVL(b.bytes,0))-sum(nvl(a.bytes,0)))/1024/1024,2)　　　已使用M,
　　ROUND(sum(nvl(a.bytes,0))/1024/1024,2)　　　　　　　　剩余,
　　sum(nvl(a.bytes,0))/Sum(NVL(b.bytes,0))*100　剩余百分比
　　from dba_free_space a,dba_data_files b ,dba_users c
　　where a.file_id=b.file_id
-- And a.tablespace_name = c.DEFAULT_TABLESPACE
-- And c.username = &DD
　　group by b.tablespace_name
　　order by b.tablespace_name ;

1、表占用空间

select segment_name, sum(bytes)/1024/1024 Mbytese from user_segments where segment_type='TABLE' group by segment_name order by Mbytese desc, segment_name;

2、索引占用空间
select segment_name ,sum(bytes)/1024/1024 from user_segments where segment_type ='INDEX' group by segment_name;

3 TEMP 表空间占用
select y.BYTES_USED/1024/1024/1024 as used_G,y.BYTES_FREE/1024/1024/1024 as free_G , y.* from v$temp_space_header y

#临时表空间太大解决办法

create temporary tablespace TEMP2 TEMPFILE '/app/oracle/oradata/ORCLYZ/temp02.dbf' size 2M reuse;
alter database default temporary tablespace TEMP2;
drop tablespace temp including contents and datafiles;
create temporary tablespace TEMP TEMPFILE '/app/oracle/oradata/ORCLYZ/temp01.dbf' size 20G reuse autoextend on;
alter database default temporary tablespace temp;
drop tablespace temp2 including contents and datafiles;
alter user switch temporary tablespace temp;

###查询表空间大小
SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,
2),
'990.99') "使用比",
F.TOTAL_BYTES "空闲空间(M)",
F.MAX_BYTES "最大块(M)"
FROM (SELECT TABLESPACE_NAME,
ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
(SELECT DD.TABLESPACE_NAME,
ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
FROM SYS.DBA_DATA_FILES DD
GROUP BY DD.TABLESPACE_NAME) D
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
ORDER BY 4 DESC

########磁盘读写最多的语句
SELECT * FROM (
　　 SELECT PARSING_USER_ID
　　　　 EXECUTIONS,
　　　　 SORTS,
　　　　 COMMAND_TYPE,
　　　　 DISK_READS,
cpu_time,
　　　　 sql_text
　　 FROM v$sqlarea
　　 ORDER BY disk_reads DESC )
　 WHERE ROWNUM<10 ;

#清空回收站
PURGE RECYCLEBIN

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