Oracle 第四天 查询TOP100

熟悉TOP100收集的基本步骤

--查前100个cpu占用率高的sql语句
SELECT *
FROM (SELECT parsing_user_id,
        executions,
        sorts,
        disk_reads,
        s.BUFFER_GETS,
        s.CPU_TIME,
        s.ELAPSED_TIME,
        sql_text,
        command_type,
        S.HASH_VALUE
      FROM  v$sqlarea s
       WHERE S.PARSING_USER_ID=uid
       ORDER BY CPU_TIME DESC)
WHERE rownum < 100 ;


--查连接数
select count(*) from v$session;
select * from v$session;
#查oracle配置
select * from v$resource_limit;
#获取执行次数前100位的SQL
SELECT *
FROM (SELECT parsing_user_id,
        executions,
        sorts,
        command_type,
        disk_reads,
        sql_text,
        S.HASH_VALUE
      FROM  v$sqlarea s
       WHERE S.PARSING_USER_ID=uid
       ORDER BY executions DESC)
WHERE rownum < 100 ;


--获取sort前100位的SQL
SELECT *
  FROM (SELECT parsing_user_id,
        executions,
        sorts,
        command_type,
        disk_reads,
        sql_text,
        S.HASH_VALUE
      FROM  v$sqlarea s
       WHERE S.PARSING_USER_ID=uid
     ORDER BY sorts DESC)
WHERE rownum < 100;     


--获取磁盘I/O前100位的SQL
SELECT *
FROM (SELECT parsing_user_id,
         executions,
         sorts,
         command_type,
         disk_reads,
         sql_text,
         S.HASH_VALUE
      FROM  v$sqlarea s
       WHERE S.PARSING_USER_ID=uid
      ORDER BY disk_reads DESC)
  WHERE rownum < 100;


--获取逻辑读前100位的SQL
SELECT *
FROM (SELECT parsing_user_id,
         executions,
         sorts,
         command_type,
         s.BUFFER_GETS,
         sql_text,
         S.HASH_VALUE
      FROM  v$sqlarea s
       WHERE S.PARSING_USER_ID=uid
      ORDER BY BUFFER_GETS DESC)
  WHERE rownum < 100;


--获取CPU消耗前100位的SQL
SELECT *
FROM (SELECT parsing_user_id,
        executions,
        sorts,
        disk_reads,
        s.BUFFER_GETS,
        s.CPU_TIME,
        s.ELAPSED_TIME,
        sql_text,
        command_type,
        S.HASH_VALUE
      FROM  v$sqlarea s
       WHERE S.PARSING_USER_ID=uid
       ORDER BY CPU_TIME DESC)
WHERE rownum < 100 ;