How does oracle slow query?

Oracle slow query method: 1. The SQL with the slowest query execution, the code is [on sa.PARSING_USER_ID = u.user_id]; 2. The SQL with the most queries, the code is [on u.USER_ID = s.PARSING_USER_ID) t].

Oracle slow query method:

Oracle does not set parameters to analyze slow queries at the same time like MySql does, however However, it provides a slow query sql statement. This sql statement needs to be logged in with an account with dba authority to query.

1. The sql with the slowest query execution

select *
 from (select sa.SQL_TEXT,
        sa.SQL_FULLTEXT,
        sa.EXECUTIONS "执行次数",
        round(sa.ELAPSED_TIME / 1000000, 2) "总执行时间",
        round(sa.ELAPSED_TIME / 1000000 / sa.EXECUTIONS, 2) "平均执行时间",
        sa.COMMAND_TYPE,
        sa.PARSING_USER_ID "用户ID",
        u.username "用户名",
        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='填写同户名'
     order by (sa.ELAPSED_TIME / sa.EXECUTIONS) desc)
 where rownum <= 50;#查询的数据数目

2. The sql with the most queries

select *
 from (select s.SQL_TEXT,
        s.EXECUTIONS "执行次数",
        s.PARSING_USER_ID "用户名",
        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;

Related learning recommendations: oracle database learning tutorial

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