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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1、求当前会话的SID，SERIAL#

         SELECT Sid, Serial#
        FROM V$session
        WHERE Audsid = Sys_Context('USERENV', 'SESSIONID');

2、查询session的OS进程ID

         SELECT p.Spid "OS Thread", b.NAME "Name-User", s.Program, s.Sid, s.Serial#,
        s.Osuser, s.Machine
        FROM V$process p, V$session s, V$bgprocess b
        WHERE p.Addr = s.Paddr
        AND p.Addr = b.Paddr
        And (s.sid=&1 or p.spid=&1)
        UNION ALL
        SELECT p.Spid "OS Thread", s.Username "Name-User", s.Program, s.Sid,
        s.Serial#, s.Osuser, s.Machine
        FROM V$process p, V$session s
        WHERE p.Addr = s.Paddr
        And (s.sid=&1 or p.spid=&1)
        AND s.Username IS NOT NULL;

3、根据sid查看对应连接正在运行的sql

         SELECT /*+ PUSH_SUBQ */
        Command_Type, Sql_Text, Sharable_Mem, Persistent_Mem, Runtime_Mem, Sorts,
        Version_Count, Loaded_Versions, Open_Versions, Users_Opening, Executions,
        Users_Executing, Loads, First_Load_Time, Invalidations, Parse_Calls,
        Disk_Reads, Buffer_Gets, Rows_Processed, SYSDATE Start_Time,
        SYSDATE Finish_Time, '>' || Address Sql_Address, 'N' Status
        FROM V$sqlarea
        WHERE Address = (SELECT Sql_Address
        FROM V$session
        WHERE Sid = &sid );

4、查找object为哪些进程所用

         SELECT p.Spid, s.Sid, s.Serial# Serial_Num, s.Username User_Name,
        a.TYPE Object_Type, s.Osuser Os_User_Name, a.Owner,
        a.OBJECT Object_Name,
        Decode(Sign(48 - Command), 1, To_Char(Command), 'Action Code #' || To_Char(Command)) Action,
        p.Program Oracle_Process, s.Terminal Terminal, s.Program Program,
        s.Status Session_Status
        FROM V$session s, V$access a, V$process p
        WHERE s.Paddr = p.Addr
        AND s.TYPE = 'USER'
        AND a.Sid = s.Sid
        AND a.OBJECT = '&obj'
        ORDER BY s.Username, s.Osuser

5、查看有哪些用户连接

         SELECT s.Osuser Os_User_Name,
        Decode(Sign(48 - Command),1,To_Char(Command),
        'Action Code #' || To_Char(Command)) Action,
        p.Program Oracle_Process, Status Session_Status, s.Terminal Terminal,
        s.Program Program, s.Username User_Name,
        s.Fixed_Table_Sequence Activity_Meter, '' Query, 0 Memory,
        0 Max_Memory, 0 Cpu_Usage, s.Sid, s.Serial# Serial_Num
        FROM V$session s, V$process p
        WHERE s.Paddr = p.Addr
        AND s.TYPE = 'USER'
        ORDER BY s.Username, s.Osuser

6、根据v.sid查看对应连接的资源占用等情况

         SELECT n.NAME, v.VALUE, n.CLASS, n.Statistic#
        FROM V$statname n, V$sesstat v
        WHERE v.Sid = &sid
        AND v.Statistic# = n.Statistic#
        ORDER BY n.CLASS, n.Statistic#

7、查询耗资源的进程（top session）

         SELECT s.Schemaname Schema_Name,
        Decode(Sign(48 - Command),
        1, To_Char(Command), 'Action Code #' || To_Char(Command)) Action,
        Status Session_Status, s.Osuser Os_User_Name, s.Sid, p.Spid,
        s.Serial# Serial_Num, Nvl(s.Username, '[Oracle process]') User_Name,
        s.Terminal Terminal, s.Program Program, St.VALUE Criteria_Value
        FROM V$sesstat St, V$session s, V$process p
        WHERE St.Sid = s.Sid
        AND St.Statistic# = To_Number('38')
        AND ('ALL' = 'ALL' OR s.Status = 'ALL')
        AND p.Addr = s.Paddr
        ORDER BY St.VALUE DESC, p.Spid ASC, s.Username ASC, s.Osuser ASC

8、查看锁（lock）情况

         SELECT /*+ RULE */
        Ls.Osuser Os_User_Name, Ls.Username User_Name,
        Decode(Ls.TYPE,
        'RW', 'Row wait enqueue lock', 'TM', 'DML enqueue lock',
        'TX', 'Transaction enqueue lock', 'UL', 'User supplied lock') Lock_Type,
        o.Object_Name OBJECT,
        Decode(Ls.Lmode,
        1, NULL, 2, 'Row Share', 3, 'Row Exclusive',
        4, 'Share', 5, 'Share Row Exclusive', 6, 'Exclusive',
        NULL) Lock_Mode,
        o.Owner, Ls.Sid, Ls.Serial# Serial_Num, Ls.Id1, Ls.Id2
        FROM Sys.Dba_Objects o,
        (SELECT s.Osuser, s.Username, l.TYPE, l.Lmode, s.Sid, s.Serial#, l.Id1,
        l.Id2
        FROM V$session s, V$lock l
        WHERE s.Sid = l.Sid) Ls
        WHERE o.Object_Id = Ls.Id1
        AND o.Owner <> 'SYS'
        ORDER BY o.Owner, o.Object_Name

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