oracle如何慢查詢？

oracle慢查詢的方法：1、查詢執行最慢的sql，代碼為【on sa.PARSING_USER_ID = u.user_id】；2、查詢次數最多的sql，代碼為【on u.USER_ID = s.PARSING_USER_ID) t】。

oracle慢查詢的方法：

Oracle沒有像MySql那樣同時設置參數來分析慢查詢，然而卻提供了慢查詢的sql語句，此Sql語句需要通過dba權限的帳號登錄進行查詢

1.查詢執行最慢的sql

select *  from (select sa.SQL_TEXT,         sa.SQL_FULLTEXT,         sa.EXECUTIONS "執行次數",         round(sa.ELAPSED_TIME / 1000000, 2) "總執行時間",         round(sa.ELAPSED_TIME / 1000000 / sa.EXECUTIONS, 2) "平均執行時間",         sa.COMMAND_TYPE,         sa.PARSING_USER_ID "用戶ID",         u.username "用戶名",         sa.HASH_VALUE      from v$sqlarea sa      left join all_users u       on sa.PARSING_USER_ID = u.user_id      where sa.EXECUTIONS > 0 where u.username='填寫同戶名'      order by (sa.ELAPSED_TIME / sa.EXECUTIONS) desc)  where rownum <= 50;#查詢的數據數目

2.查詢次數最多的sql

select *  from (select s.SQL_TEXT,         s.EXECUTIONS "執行次數",         s.PARSING_USER_ID "用戶名",         rank() over(order by EXECUTIONS desc) EXEC_RANK      from v$sql s      left join all_users u       on u.USER_ID = s.PARSING_USER_ID) t  where exec_rank <= 100;

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