记录一次监控表空间使用率增长快原因

Posted 2020-10-14 ClarkYu

最近发现生产环境主要表空间增长过快，每天几个G，想查看一下原因。

查看快照信息：
select * from DBA_HIST_SNAPSHOT order by 1 desc
根据快照信息，查看历史端使用情况：
create table t1 as select * from DBA_HIST_SEG_STAT  where snap_id=426
create table t2 as select * from DBA_HIST_SEG_STAT  where snap_id=426+24;
统计使用情况：
select t1.obj#,
       t1.dataobj#,
       t2.SPACE_ALLOCATED_TOTAL - t1.SPACE_ALLOCATED_TOTAL
  from t1, t2
 where t1.obj# = t2.obj#
   and t1.dataobj# = t2.dataobj#
 order by 3 desc;

然后链接上DBA_HIST_SEG_STAT_OBJ表确定表名

select t1.obj#,
       t1.dataobj#,
       t2.SPACE_ALLOCATED_TOTAL - t1.SPACE_ALLOCATED_TOTAL,
a.owner
a.object_name
  from t1, t2,DBA_HIST_SEG_STAT_OBJ a
 where t1.obj# = t2.obj#
   and t1.dataobj# = t2.dataobj#
and t1.obj#=a.obj#
and t1.dataobj#=a.dataobj#
 order by 3 desc;

稍后会根据这些情况查看相应表，从而定位业务。

查看数据文件的创建时间：
select file#,t.CREATION_TIME,t.NAME from v$datafile t order by 2 desc