System表空间不足的报警问题浅析

废话不多说了，具体代码如下所示：

--SYSTEM表空间不足的报警
登录之后，查询，发现是sys.aud$占的地方太多。
SQL> select owner, segment_name, segment_type, sum(bytes)/1024/1024 space_m
  from dba_segments
  where tablespace_name = 'SYSTEM'
group by owner, segment_name, segment_type
having sum(bytes)/1024/1024 >= 20
order by space_m desc
;
 4  5  6  7
OWNER  SEGMENT_NAME   SEGMENT_TYPE SPACE_M
-------- ------------------------------- -------
SYS   AUD$       TABLE      4480
SYS   IDL_UB1$     TABLE       272
SYS   SOURCE$      TABLE       72
SYS   IDL_UB2$     TABLE       32
SYS   C_OBJ#_INTCOL#  CLUSTER      27
SYS   C_TOID_VERSION#  CLUSTER      24
6 rows selected.
SQL>
查看是哪个记得比较多。
col userhost format a30
select userid, userhost, count(1) from sys.aud$
where ntimestamp# >=CAST(to_date('2014-03-01 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
group by userid, userhost
having count(1) > 500
order by count(1) desc
;
再继续找哪天比较多。
select to_char(ntimestamp#, 'YYYY-MM-DD') audit_date, count(1)
from sys.aud$
where ntimestamp# >=CAST(to_date('2014-03-01 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and userid = 'xxxx' and userhost = 'xxxx'
group by to_char(ntimestamp#, 'YYYY-MM-DD')
order by count(1) desc
;
select spare1, count(1) from sys.aud$
where ntimestamp# between CAST(to_date('2014-03-10 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and CAST(to_date('2014-03-11 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and userid = 'xxxx' and userhost = 'xxxx'
group by spare1
;
select action#, count(1) from sys.aud$
where ntimestamp# between CAST(to_date('2014-03-10 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and CAST(to_date('2014-03-11 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and userid = 'xxxx' and userhost = 'xxxx'
and spare1 = 'xxxx'
group by action#
order by count(1) desc
;
结果如下：
  ACTION#  COUNT(1)
---------- ----------
    101   124043
    100   124043
SQL>
其实是上次打开的audit一直没有关闭。
关闭：
SQL> noaudit session;
清空：
truncate table sys.aud$;
------------------------------------------------------------------------
实战
------------------------------------------------------------------------
--1,查询表空间占用情况
select dbf.tablespace_name as tablespace_name,
     dbf.totalspace as totalspace,
     dbf.totalblocks as totalblocks,
     dfs.freespace freespace,
     dfs.freeblocks freeblocks,
     (dfs.freespace / dbf.totalspace) * 100 as freeRate
     from (select t.tablespace_name,
     sum(t.bytes) / 1024 / 1024 totalspace,
     sum(t.blocks) totalblocks
     from DBA_DATA_FILES t
     group by t.tablespace_name) dbf,
     (select tt.tablespace_name,
     sum(tt.bytes) / 1024 / 1024 freespace,
     sum(tt.blocks) freeblocks
     from DBA_FREE_SPACE tt
     group by tt.tablespace_name) dfs
     where trim(dbf.tablespace_name) = trim(dfs.tablespace_name)
--2,查看哪里占的比较多 SYSTEM 为step1中查询 tablespace_name 内容
select owner, segment_name, segment_type, sum(bytes)/1024/1024 space_m
  from dba_segments
  where tablespace_name = 'SYSTEM'
group by owner, segment_name, segment_type
having sum(bytes)/1024/1024 >= 20
order by space_m desc
--3,查看是哪个记得比较多 count(1) 越大,说明占得比较多
select userid, userhost, count(1) from sys.aud$
where ntimestamp# >=CAST(to_date('2014-03-01 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
group by userid, userhost
having count(1) > 500
order by count(1) desc
--4,再继续找哪天比较多 userid userhost 为上一步查询内容
select to_char(ntimestamp#, 'YYYY-MM-DD') audit_date, count(1)
from sys.aud$
where ntimestamp# >=CAST(to_date('2015-03-01 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and userid = 'userid' and userhost = 'userhost'
group by to_char(ntimestamp#, 'YYYY-MM-DD')
order by count(1) desc
;
select spare1, count(1) from sys.aud$
where ntimestamp# between CAST(to_date('2016-03-10 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and CAST(to_date('2016-12-11 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and userid = 'userid' and userhost = 'userhost'
group by spare1
;
--spare1 为上一步查询内容
select action#, count(1) from sys.aud$
where ntimestamp# between CAST(to_date('2016-03-10 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and CAST(to_date('2016-12-11 00:00:00', 'YYYY-MM-DD hh24:mi:ss') AS TIMESTAMP)
and userid = 'userid' and userhost = 'userhost'
and spare1 = 'Administrator'
group by action#
order by count(1) desc
--5,关闭seeion
noaudit session;
--6,清空：
truncate table sys.aud$; 

总结

以上所述是小编给大家介绍的System表空间不足的报警，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！