oracle sql tuning之非常实用的4条sql语句

--[1]查看full sql text

SELECTp.sql_fulltext

  FROM gv$locked_object l, gv$session s, gv$sqlarea p

 WHERE l.session_id = s.sid

   and s.sql_id = p.sql_id;

--[2]查看表和锁的相关信息

SELECTdistinct

       s.username,

       s.inst_id,

      o.object_name,

       s.wait_class,

       'alter system kill session ''' || s.sid ||',' ||s.serial# ||

       ''' immediate;'as sql_kill_session,

       'ps -ef | grep ' || p.spid ||' | grep -v grep'as shell_grep_proc,

       'kill -9 ' || p.spidas shell_kill_proc,

      s.blocking_session,

      s.seconds_in_wait,

       machine,

       p.program,

       s.sql_id

  FROM gv$locked_object l, dba_objects o, gv$session s,gv$process p

 WHERE l.object_id = o.object_id

   AND l.session_id = s.sid

   and s.paddr = p.addr

   and s.usernamein ('J1_DW','J1_LDCX','J1_LDM','J1_G3_ZBQ')

   --and machine='fjstj1ap01'

   --and s.inst_id = '1';

   orderby o.object_name,s.username;

  

--[3]查看真实的执行计划

declare

  type array_table is table of varchar2(4000 char) index by binary_integer;

  lvc_array array_table;

  i         number;

begin

  dbms_output.enable(buffer_size => null);

  execute immediate 'select *

  from TABLE(DBMS_XPLAN.DISPLAY_CURSOR(''1s87w0c9x0z5g'', 0, ''ADVANCED''))' bulk

                    collect

    into lvc_array;

  for i in 1 .. lvc_array.count loop

    dbms_output.put_line(lvc_array(i));

  end loop;

end;

 

--[4]进行sql tuning

declare

  lv_task_name varchar2(30);

begin

  --select instance_name,instance_numberfrom v$instance;

  lv_task_name :=DBMS_SQLTUNE.create_tuning_task(sql_id =>'ggudmy1v4muuz',

                                                 scope       =>'comprehensive',

                                                 time_limit  =>'60',

                                                 task_name   =>'sql_tuning_DM2_ZS_ZDSYQYRKHXS',

                                                  description =>'taskto tune a query');

 dbms_output.put_line(lv_task_name);

 DBMS_SQLTUNE.execute_tuning_task(task_name =>
'sql_tuning_DM2_ZS_ZDSYQYRKHXS');

end;

  --查看report_tuning_task

selectdbms_sqltune.report_tuning_task('sql_tuning_DM2_ZS_ZDSYQYRKHXS')fromdual;

  --使用sql profile

begin

 dbms_sqltune.accept_sql_profile(task_name  =>
'sql_tuning_DM2_ZS_ZDSYQYRKHXS',

                                  task_owner=>
'J1_DW',

                                  replace    =>TRUE);

END;