TEMP表空间爆满处理一例 推荐

今早巡检数据库发现如下报错：

Fri Jul 15 06:03:03 2011
ORA-1652: unable to extend temp segment by 128 in tablespace TEMP
……
Fri Jul 15 08:02:59 2011
ORA-1652: unable to extend temp segment by 128 in tablespace TEMP

通过查看表空间发现，TEMP表空间被扩展到了32G，而原先设置的只有4G，我们通过如下语句分析TEMP表空间有什么东西这么耗空间：
SELECT se.username,sid,serial#,sql_address,machine, program,tablespace,segtype,contents

FROM v$session se,v$sort_usage su

WHERE se.saddr=su.session_addr

Order By machine

查询结果如下：

USERNAME	SID	SERIAL#	SQL_ADDRESS	MACHINE	PROGRAM	TABLESPACE	SEGTYPE	CONTENTS
PHC	831	307	00	PORT-web		TEMP	LOB_DATA	TEMPORARY
PHC	897	10837	00	PORT-web		TEMP	LOB_DATA	TEMPORARY
PHC	928	62946	00	PORT-web		TEMP	LOB_DATA	TEMPORARY
PHC	893	59116	00	PORT-web		TEMP	LOB_DATA	TEMPORARY
PHC	1081	30775	00	PORT-web		TEMP	LOB_DATA	TEMPORARY
PHC	1025	24989	00	PORT-web		TEMP	LOB_DATA	TEMPORARY
PHC	907	10378	00	WORKGROUP\PORT-SJJH2	PLSQLDev.exe	TEMP	LOB_DATA	TEMPORARY
EPORT_ADMIN	1080	63733	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	923	43188	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	1047	23	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	929	29713	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	816	44578	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	910	20498	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	969	50313	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	915	57	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	876	7930	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	906	40178	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	836	26868	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY
EPORT_ADMIN	912	50385	000000025B61AF28	WORKGROUP\TEST-WZTJFZ	logread.exe	TEMP	SORT	TEMPORARY

仔细看如下查询结果，EPORT_ADMIN是以前很少见到的，怀疑logread.exe存在嫌疑，考虑到这只是个数据同步进程，考虑如下命令KILL掉：

Alter system kill session '1080,63733';
Alter system kill session '923,43188';
Alter system kill session '1047,23';
Alter system kill session '929,29713';
Alter system kill session '816,44578';
Alter system kill session '910,20498';
Alter system kill session '969,50313';
Alter system kill session '915,57';
Alter system kill session '876,7930';
Alter system kill session '906,40178';
Alter system kill session '836,26868';
Alter system kill session '912,50385';

语句执行后EPORT_ADMIN的进程在TEMP表空间消失，再来看TEMP表空间，已经基本清空：

Name	Size (MB)	Used (MB)	Used (%)	Free (MB)	Status	Datafiles	Type
TEMP	32,767.00	47	0.1	32,720.00		1	TEMPORARY

结论：显然EPORT_ADMIN下的logread.exe存在大量表空间的开销，这在业务高峰期是非常危险的现象。