• 查询Oracle性能差的、正在执行或执行过的SQL语句


    查找前十条性能差的sql. 

    SELECT * FROM (select PARSING_USER_ID,EXECUTIONS,SORTS, 
    COMMAND_TYPE,DISK_READS,sql_text FROM v$sqlarea 
    order BY disk_reads DESC )where ROWNUM<10 ; 

    查看占io较大的正在运行的session 

    SELECT se.sid,se.serial#,pr.SPID,se.username,se.status, 
    se.terminal,se.program,se.MODULE,se.sql_address,st.event,st. 
    p1text,si.physical_reads, 
    si.block_changes FROM v$session se,v$session_wait st, 
    v$sess_io si,v$process pr WHERE st.sid=se.sid AND st. 
    sid=si.sid AND se.PADDR=pr.ADDR AND se.sid>6 AND st. 
    wait_time=0 AND st.event NOT LIKE '%SQL%' ORDER BY physical_reads DESC

    ---正在执行的

    select a.username, a.sid,b.SQL_TEXT, b.SQL_FULLTEXT
      from v$session a, v$sqlarea b 
    where a.sql_address = b.address 

    ---执行过的

    select b.SQL_TEXT,b.FIRST_LOAD_TIME,b.SQL_FULLTEXT
      from v$sqlarea b
    where b.FIRST_LOAD_TIME between '2009-10-15/09:24:47' and
           '2009-10-15/09:24:47' order by b.FIRST_LOAD_TIME 

    (此方法好处可以查看某一时间段执行过的sql,并且 SQL_FULLTEXT 包含了完整的 sql 语句)


    其他

    select OSUSER,PROGRAM,USERNAME,SCHEMANAME,B.Cpu_Time,STATUS,B.SQL_TEXT 
    from V$SESSION A LEFT JOIN V$SQL B ON A.SQL_ADDRESS=B.ADDRESS AND A.SQL_HASH_VALUE=B.HASH_VALUE order by b.cpu_time desc 
    
    select address, sql_text, piece 
      from v$session, v$sqltext 
    where address = sql_address 
      -- and machine = < you machine name > 
    order by address, piece 
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  • 原文地址:https://www.cnblogs.com/vipsoft/p/3950996.html
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