Oracle数据库维护常用SQL语句集合

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韩东

2008-7-1

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9、查看等待（wait）情况

         SELECT Ws.CLASS, Ws.COUNT COUNT, SUM(Ss.VALUE) Sum_Value
        FROM V$waitstat Ws, V$sysstat Ss
        WHERE Ss.NAME IN ('db block gets', 'consistent gets')
        GROUP BY Ws.CLASS, Ws.COUNT

10、求process/session的状态

         SELECT p.Pid, p.Spid, s.Program, s.Sid, s.Serial#
        FROM V$process p, V$session s
        WHERE s.Paddr = p.Addr;

11、求谁阻塞了某个session(10g)

         SELECT Sid, Username, Event, Blocking_Session, Seconds_In_Wait, Wait_Time
        FROM V$session
        WHERE State IN ('WAITING')
        AND Wait_Class != 'Idle';

12、查会话的阻塞

         col user_name format a32
        SELECT /*+ rule */
        Lpad(' ', Decode(l.Xidusn, 0, 3, 0)) || l.Oracle_Username User_Name,
        o.Owner, o.Object_Name, s.Sid, s.Serial#
        FROM V$locked_Object l, Dba_Objects o, V$session s
        WHERE l.Object_Id = o.Object_Id
        AND l.Session_Id = s.Sid
        ORDER BY o.Object_Id, Xidusn DESC;
        col username format a15
        col lock_level format a8
        col owner format a18
        col object_name format a32
        SELECT /*+ rule */
        s.Username,
        Decode(l.TYPE, 'tm', 'table lock', 'tx', 'row lock', NULL) Lock_Level,
        o.Owner, o.Object_Name, s.Sid, s.Serial#
        FROM V$session s, V$lock l, Dba_Objects o
        WHERE l.Sid = s.Sid
        AND l.Id1 = o.Object_Id(+)
        AND s.Username IS NOT NULL;

13、求等待的事件及会话信息/求会话的等待及会话信息

         SELECT Se.Sid, s.Username, Se.Event, Se.Total_Waits, Se.Time_Waited,
        Se.Average_Wait
        FROM V$session s, V$session_Event Se
        WHERE s.Username IS NOT NULL
        AND Se.Sid = s.Sid
        AND s.Status = 'ACTIVE'
        AND Se.Event NOT LIKE '%SQL*Net%'
        ORDER BY s.Username;
        SELECT s.Sid, s.Username, Sw.Event, Sw.Wait_Time, Sw.State,
        Sw.Seconds_In_Wait
        FROM V$session s, V$session_Wait Sw
        WHERE s.Username IS NOT NULL
        AND Sw.Sid = s.Sid
        AND Sw.Event NOT LIKE '%SQL*Net%'
        ORDER BY s.Username;

14、求会话等待的file_id/block_id

         col event format a24
        col p1text format a12
        col p2text format a12
        col p3text format a12
        SELECT Sid, Event, P1text, P1, P2text, P2, P3text, P3
        FROM V$session_Wait
        WHERE Event NOT LIKE '%SQL%'
        AND Event NOT LIKE '%rdbms%'
        AND Event NOT LIKE '%mon%'
        ORDER BY Event;
        SELECT NAME, Wait_Time
        FROM V$latch l
        WHERE EXISTS (SELECT 1
        FROM (SELECT Sid, Event, P1text, P1, P2text, P2, P3text, P3
        FROM V$session_Wait
        WHERE Event NOT LIKE '%SQL%'
        AND Event NOT LIKE '%rdbms%'
        AND Event NOT LIKE '%mon%') x
        WHERE x.P1 = l.Latch#);

15、求会话等待的对象

         col owner format a18
        col segment_name format a32
        col segment_type format a32
        SELECT Owner, Segment_Name, Segment_Type
        FROM Dba_Extents
        WHERE File_Id = &File_Id
        AND &Block_Id BETWEEN Block_Id AND Block_Id + Blocks - 1;

16、求出某个进程，并对它进行跟踪

         SELECT s.Sid, s.Serial#
        FROM V$session s, V$process p
        WHERE s.Paddr = p.Addr
        AND p.Spid = &1;
        Exec Dbms_System.Set_Sql_Trace_In_Session(&1, &2, TRUE);
        Exec Dbms_System.Set_Sql_Trace_In_Session(&1, &2, FALSE);

17、求当前session的跟踪文件

         SELECT P1.VALUE || '/' || P2.VALUE || '_ora_' || p.Spid || '.ora' Filename
        FROM V$process p, V$session s, V$parameter P1, V$parameter P2
        WHERE P1.NAME = 'user_dump_dest'
        AND P2.NAME = 'instance_name'
        AND p.Addr = s.Paddr
        AND s.Audsid = Userenv('SESSIONID')
        AND p.Background IS NULL
        AND Instr(p.Program, 'CJQ') = 0;

18、求出锁定的对象

        SELECT Do.Object_Name, Session_Id, Process, Locked_Mode
        FROM V$locked_Object Lo, Dba_Objects Do
        WHERE Lo.Object_Id = Do.Object_Id;

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