临时表空间空间不足解决方法
--临时表空间空间不足解决方法
--关闭自动增长
SYS@PROD2> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production PL/SQL Release 11.2.0.3.0 - Production CORE 11.2.0.3.0 Production TNS for Linux: Version 11.2.0.3.0 - Production NLSRTL Version 11.2.0.3.0 - Production SYS@PROD2> alter database tempfile '/u01/app/oracle/oradata/PROD2/temp02.dbf' autoextend off; Database altered. SYS@PROD2> alter database tempfile '/u01/app/oracle/oradata/PROD2/temp02.dbf' resize 2m; Database altered. SCOTT@PROD2> select * from temp1 order by 1,2,3,4,5,6,7,8,9; select * from temp1 order by 1,2,3,4,5,6,7,8,9 * ERROR at line 1: ORA-01652: unable to extend temp segment by 128 in tablespace TEMP SCOTT@PROD2> set autot trace exp SCOTT@PROD2> select * from temp1 order by 1,2,3,4,5,6,7,8,9; Execution Plan ---------------------------------------------------------- Plan hash value: 3339515882 ------------------------------------------------------------------------------------ | Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | ------------------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 10M| 1542M| | 361K (1)| 01:12:18 | | 1 | SORT ORDER BY | | 10M| 1542M| 1904M| 361K (1)| 01:12:18 | | 2 | TABLE ACCESS FULL| TEMP1 | 10M| 1542M| | 4909 (6)| 00:00:59 | ------------------------------------------------------------------------------------ Note ----- - dynamic sampling used for this statement (level=2) 查看执行计划，发现估算需要1904M空间 SYS@PROD2> alter database tempfile '/u01/app/oracle/oradata/PROD2/temp02.dbf' resize 2000m; Database altered. SCOTT@PROD2> select * from temp1 order by 1,2,3,4,5,6,7,8,9; 54247 rows selected. --时间太长中止了 但是通过resize很难准确调整，很容易导致过度使用的问题。 11g以前只能重建表空间替换原来临时表空间。 在11g中可以使用在线回收临时表空间的功能。 SYS@PROD2> ho ls -lh /u01/app/oracle/oradata/PROD2/temp02.dbf --当前大小2G -rw-r----- 1 oracle oinstall 2.0G Dec 13 16:55 /u01/app/oracle/oradata/PROD2/temp02.dbf SYS@PROD2> alter tablespace temp shrink space; --使用在线回收 Tablespace altered. SYS@PROD2> ho ls -lh /u01/app/oracle/oradata/PROD2/temp02.dbf --大小缩小为139M -rw-r----- 1 oracle oinstall 139M Dec 13 17:01 /u01/app/oracle/oradata/PROD2/temp02.dbf SYS@PROD2> alter tablespace temp shrink space keep 20m; --通过KEEP语句指定回收大小 Tablespace altered. SYS@PROD2> ho ls -lh /u01/app/oracle/oradata/PROD2/temp02.dbf -rw-r----- 1 oracle oinstall 139M Dec 13 17:01 /u01/app/oracle/oradata/PROD2/temp02.dbf 发现大小并未回收，说明这部分空间正在被使用。