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  • 优化oracle读写任务

     查读盘次数最多的前十个sql操作:

    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;

     发现有一条是垃圾操作。

    select * from v$sqlarea where sql_text like '%PM_TD_PERFCDL_temp%'
    
    select * from v$sql where sql_text like '%PM_TD_PERFCDL_temp%'

    查到这条命令的执行时间:

     我猜他是定时操作:

    在user_job中找到相应时间的任务:

    发现是一个名为DT_PM_EXTENDEDGL();的过程:

    create or replace procedure DT_PM_EXTENDEDGL is
      del_time  date;
      tablename varchar2(100);
      plsql     varchar2(400);
      cursor perftableCur is
        select distinct a.tablename
        from pm_tablename_vs_groupid a,
             (select distinct b.group_id
                from pm_guideline b
               where b.net_type = 'TD'
                 and b.type = 'NEDEF') c
       where a.group_id = c.group_id
         and a.net_type = 'TD'
         order by a.tablename;
    begin
      del_time := sysdate - 1 / 24;
      dbms_output.put_line('delete time is:' ||
                           to_char(del_time, 'yyyy-mm-dd hh24:mi:ss'));
    
      for perftableCurRec in perftableCur loop
        tablename := perftableCurRec.tablename;
        plsql     := 'delete from ' || tablename ||
                     '_temp where begin_time <=(sysdate - 1 / 24)';
        --dbms_output.put_line(plsql);
        execute immediate plsql;
        commit;
      end loop;
    
    end DT_PM_EXTENDEDGL;

    执行前面的select语句:

    select distinct a.tablename
      from pm_tablename_vs_groupid a,
           (select distinct b.group_id
              from pm_guideline b
             where b.net_type = 'TD'
               and b.type = 'NEDEF') c
     where a.group_id = c.group_id
       and a.net_type = 'TD'
     order by a.tablename;

     结果都是废弃的表。

    可以把这个任务停掉?

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  • 原文地址:https://www.cnblogs.com/wangziyi0513/p/11210239.html
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