在數據庫檢查中發現SYSAUX表空間占用過大，SYSAUX是ORACLE10G開始提供的功能，用於數據庫為SYSTEM表空間減負。
用以下語句查出相應的表空間值
select
a.tablespace_name,trunc(sum(a.bytes)/1024/1024/1024,2) total,
trunc(sum(a.bytes)/1024/1024/1024 - sum(b.bytes)/1024/1024/1024,2) used,
trunc(sum(b.bytes)/1024/1024/1024,2) free,
to_char(trunc((sum(a.bytes)/1024/1024/1024-sum(b.bytes)/1024/1024/1024)/(sum(a.bytes)/1024/1024/1024),4)*100)||'%' pused,
to_char(trunc((sum(b.bytes)/1024/1024/1024)/(sum(a.bytes)/1024/1024/1024),4)*100)||'%' pfree
from (select sum(bytes) bytes,tablespace_name from dba_data_files group by tablespace_name) a,(select sum(bytes) bytes,tablespace_name from dba_free_space group by tablespace_name) b
where a.tablespace_name=b.tablespace_name(+)
group by a.tablespace_name;
查出表空SYSAUX占用率過高
SYSAUX共13.84G 其使用率95%
通過以下語句查出什么使用這么多空間
SELECT occupant_name "Item",
space_usage_kbytes / 1048576 "Space Used (GB)",
schema_name "Schema",
move_procedure "Move Procedure"
FROM v$sysaux_occupants
ORDER BY 2 desc;
從上圖可以看到其中AWR用了11G空間
查看下AWR統計數的保存天數
select dbms_stats.get_stats_history_retention from dual;
通過 select dbid, min(snap_id),max(snap_id) from dba_hist_snapshot group by dbid;
查出相應的DBID和SNAP_ID,
- 清空上一個dbid下的所有snapshot
exec dbms_workload_repository.drop_snapshot_range(29737,29943,310691130);
等待太久了‘
為了加快清除速實施以下操作
查找到那些占用sysaux表空間的基表，按照大小進行排序
select * from (select segment_name,PARTITION_NAME,segment_type,bytes/1024/1024 from dba_segments where tablespace_name='SYSAUX' order by 4 desc) where rownum<=10;
查出以下內容
備份基表WRH$ACTIVE_SESSION_HISTOR,WRH$_SQLSTAS,WRH$_EVENT_HISTOGRAM
create table WRH$_ACTIVE_SESSION_HISTORY0926 as select * from WRH$_ACTIVE_SESSION_HISTORY;
create table WRH$_SQLSTAT0926 as select * from WRH$_SQLSTAT;
create table WRH$_EVENT_HISTOGRAM0926 as select * from WRH$_EVENT_HISTOGRAM;
create table WRH$_LATCH0926 as select * from WRH$_LATCH;
清除相應基表數據
truncate table WRH$_ACTIVE_SESSION_HISTORY;
truncate table WRH$_EVENT_HISTOGRAM;
truncate table WRH$_SQLSTAT;
truncate table WRH$_LATCH_MISSES_SUMMARY;
truncate table WRH$_LATCH;
truncate table WRH$_SYSSTAT;
truncate table WRH$_SEG_STAT;
truncate table WRH$_PARAMETER;
truncate table WRH$_SYSTEM_EVENT;
truncate table WRH$_SQL_PLAN;
truncate table WRH$_DLM_MISC;
truncate table WRH$_SERVICE_STAT;
truncate table WRH$_TABLESPACE_STAT;
truncate table WRH$_ROWCACHE_SUMMARY;
truncate table WRH$_MVPARAMETER;