oracle 監控SQL 效能

Tue, 05 Mar 2024 00:02:22 +0800

這幾天在調校系統校能，想說從資料庫快取中看看能不能找出花費系統高的系統資源，後來從網路拼拼湊湊加上過去的經驗拼湊下面的監控SQL。拼湊好後，會透過kettle 搭配系統排程匯出查詢結果。

oracle 記憶體監控

Mon, 04 Mar 2024 00:02:22 +0800

透過 v$sgastat 、v$pgastat 檢測 SGA PGA 空間使用狀況

select name,used,free, pctused, max_allocated , sysdate opdt from (
select name,total,round(total-free,2) used, round(free,2) free,round((total-free)/total*100,2) pctused, round(MAX_ALLOCATED,2) MAX_ALLOCATED from
(
select 'SGA' name,(select sum(value/1024/1024) from v$sga) total,
(SELECT SUM (bytes/1024/1024)  FROM V$SGAINFO WHERE NAME='Maximum SGA Size') MAX_ALLOCATED ,
(select sum(bytes/1024/1024) from v$sgastat where name='free memory')free 
from dual
)
union
select name,total,round(used,2)used,round(total-used,2)free,round(used/total*100,2) pctused,round(MAX_ALLOCATED,2)   from (
select 'PGA' name,(select value/1024/1024 total from v$pgastat where name='aggregate PGA target parameter')total,
(SELECT (value/1024/1024)  FROM V$PGASTAT WHERE NAME = 'maximum PGA allocated') MAX_ALLOCATED,
(select value/1024/1024 used from v$pgastat where name='total PGA allocated')used 
from dual
)
);

sqlplus / as sysdba << EOF
@/home/oracle/check-health-script/check-memory.sql
exit
EOF

awrrpt
#

sqlplus / as sysdba << EOF
@/u01/app/oracle/product/12.2.0/dbhome_1/rdbms/admin/awrrpt.sql
exit
EOF

參考資料
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Database Reference-8.121 V$PGASTAT

系統調校 on PolloChang 工作筆記

oracle 監控SQL 效能

oracle 記憶體監控

awrrpt #

參考資料 #

awrrpt
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參考資料
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