如何找出引起ORA-1652的SQL
Wed Aug 20 17:16:37 2008 ORA-1652: unable to extend temp segment by 128 in tablespace DBA_TEMP 要解决这个问题,我们首先要导致这个问题的SQL,可能方法有几种: 1、设置events alter system set events '1652 trace name errorstack level 1'; 这种方
Wed Aug 20 17:16:37 2008
ORA-1652: unable to extend temp segment by 128 in tablespace DBA_TEMP
要解决这个问题,我们首先要导致这个问题的SQL,可能方法有几种:
1、设置events
alter system set events '1652 trace name errorstack level 1';
这种方法有一定局限:
1)它不能获取已发生的1652的错误信息,只能对以后出现1652错误时生成一个trace文件;
2)用events,不清楚会对数据库有什么不好的影响。
2、查询V$SQL视图:
如select * from v$sql order by direct_writes/executions desc;
这种方法的局限性是:
1)因为很难知道V$SQL视图中的SQL执行时间,难以确认具体是那个SQL导致错误的
2)引起问题的SQL极有可能已经被age out了
3、 生成错误发生时的awr、statspack报表,从报表中的SQL ordered by Reads部分找出SQL
这种方法更不可靠,,因为:
1) SQL ordered by Reads读写的不一定是临时表空间
2) awr/statspack报表是根据物理读的总量排序的,如果导致问题的SQL执行次数少,那也是不会出现在这些报表中的。
4、查询awr相关视图
对于10G来说,这种方法是最可行、最准确的。
SELECT DISTINCT TO_CHAR(SUBSTR(b.sql_text,1,4000))
FROM sys.WRH$_SQLTEXT b
WHERE b.sql_id IN
(SELECT sql_id
FROM
(SELECT a.sql_id
FROM sys.WRH$_SQLSTAT a
WHERE a.parsing_schema_name NOT IN ('SYS')
AND a.executions_total >0
AND a.direct_writes_total >0
AND a.SNAP_ID IN
(SELECT SNAP_ID
FROM sys.WRM$_SNAPSHOT
WHERE to_date('2008:08:20 17:20:08','yyyy:mm:dd hh24:mi:ss') BETWEEN begin_interval_time AND end_interval_time
)
ORDER BY a.direct_writes_total/ a.executions_total DESC
)
WHERE rownum
);
基本上,结果中的第一句只要不是insert /*+ append */之类的语句,那么它就极有可能是导致ORA-1652的SQL。
如果是9i,用statspack,也可以用类似的SQL从statspack视图查到需要的结果。

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