Oracle數據庫維護是作為一名數據庫管理員必須要掌握的技能。數據庫維護的操作有很多種,本文我們總結了18種常用的數據庫維護操作的SQL代碼示例,接下來就讓我們一起來了解一下這部分內容吧。
1、求當前會話的SID,SERIAL#
- SELECT Sid, Serial#
- FROM V$session
- WHERE Audsid = Sys_Context('USERENV', 'SESSIONID');
2、查詢session的OS進程ID
- SELECT p.Spid "OS Thread", b.NAME "Name-User", s.Program, s.Sid, s.Serial#,
- s.Osuser, s.Machine
- FROM V$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、根據sid查看對應連接正在運行的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為哪些進程所用
- 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$process p
- WHERE s.Paddr = p.Addr
- AND s.TYPE = 'USER'
- AND a.Sid = s.Sid
- AND a.OBJECT = '&obj'
- ORDER BY s.Username, s.Osuser
5、查看有哪些用戶連接
- SELECT s.Osuser Os_User_Name,
- Decode(Sign(48 - Command),1,To_Char(Command),
- 'Action Code #' || To_Char(Command)) Action,
- p.Program Oracle_Process, Status Session_Status, s.Terminal Terminal,
- s.Program Program, s.Username User_Name,
- s.Fixed_Table_Sequence Activity_Meter, '' Query, 0 Memory,
- 0 Max_Memory, 0 Cpu_Usage, s.Sid, s.Serial# Serial_Num
- FROM V$session s, V$process p
- WHERE s.Paddr = p.Addr
- AND s.TYPE = 'USER'
- ORDER BY s.Username, s.Osuser
6、根據v.sid查看對應連接的資源占用等情況
- SELECT n.NAME, v.VALUE, n.CLASS, n.Statistic#
- FROM V$statname n, V$sesstat v
- WHERE v.Sid = &sid
- AND v.Statistic# = n.Statistic#
- ORDER BY n.CLASS, n.Statistic#
7、查詢耗資源的進程(top session)
- SELECT s.Schemaname Schema_Name,
- Decode(Sign(48 - Command),
- 1, To_Char(Command), 'Action Code #' || To_Char(Command)) Action,
- Status Session_Status, s.Osuser Os_User_Name, s.Sid, p.Spid,
- s.Serial# Serial_Num, Nvl(s.Username, '[Oracle process]') User_Name,
- s.Terminal Terminal, s.Program Program, St.VALUE Criteria_Value
- FROM V$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、查看鎖(lock)情況
- 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
9、查看等待(wait)情況
10、求process/session的狀態
- SELECT p.Pid, p.Spid, s.Program, s.Sid, s.Serial#
- FROM V$process p, V$session s
- WHERE s.Paddr = p.Addr;
11、求誰阻塞了某個session(10g)
- SELECT Sid, Username, Event, Blocking_Session, Seconds_In_Wait, Wait_Time
- FROM V$session
- WHERE State IN ('WAITING')
- AND Wait_Class != 'Idle';
12、查會話的阻塞
- col user_name format a32
- SELECT /*+ rule */
- Lpad(' ', Decode(l.Xidusn, 0, 3, 0)) || l.Oracle_Username User_Name,
- o.Owner, o.Object_Name, s.Sid, s.Serial#
- FROM V$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$lock l, Dba_Objects o
- WHERE l.Sid = s.Sid
- AND l.Id1 = o.Object_Id(+)
- AND s.Username IS NOT NULL;
13、求等待的事件及會話信息/求會話的等待及會話信息
- SELECT Se.Sid, s.Username, Se.Event, Se.Total_Waits, Se.Time_Waited,
- Se.Average_Wait
- FROM V$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$session_Wait Sw
- WHERE s.Username IS NOT NULL
- AND Sw.Sid = s.Sid
- AND Sw.Event NOT LIKE '%SQL*Net%'
- ORDER BY s.Username;
14、求會話等待的file_id/block_id
- col event format a24
- col p1text format a12
- col p2text format a12
- col p3text format a12
- SELECT Sid, Event, P1text, P1, P2text, P2, P3text, P3
- FROM V$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、求會話等待的對象
- 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、求出某個進程,並對它進行跟蹤
- 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、求當前session的跟蹤文件
- 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、求出鎖定的對象
- SELECT Do.Object_Name, Session_Id, Process, Locked_Mode
- FROM V$locked_Object Lo, Dba_Objects Do
- WHERE Lo.Object_Id = Do.Object_Id;
關於Oracle數據庫維護常用的SQL代碼示例就介紹到這裡了,希望本次的介紹能夠對您有所收獲!