刪除臨時表空間hang處理

今天在本機資料庫做測試的時候當刪除臨時表空間時hang住了，等了好久沒見反應，
後面果斷kill退出會話重來刪除成功。經分析遭遇Bug 15913577，真是夠背，欲知詳細，請容我一一道來。


1、刪除表空間，一直處於等待狀態，最後不得以ctrl+c：
SQL> alter database default  temporary tablespace temp1;


Database altered.


SQL> drop  tablespace temp including contents and datafiles;














drop  tablespace temp including contents and datafiles
*
ERROR at line 1:
ORA-01013: user requested cancel of current operation


2、檢視程式hang的等待事件如下：
11gdb[/home/oracle]$ps -ef |grep LOCAL=YES
oracle   24109 24108  0 15:37 ?        00:00:01 oracleora11gdb (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
oracle   24257 24182  0 16:03 pts/1    00:00:00 grep LOCAL=YES


SQL> select sid,sql_id,status,event from v$session where paddr = (select addr from v$process where spid = 24109);


       SID SQL_ID        STATUS   EVENT                                                           
---------- ------------- -------- ----------------------------------------------------------------
         1 63yna2jqw03x0 ACTIVE   enq: TS - contention                                            




3、做了下systemdump如下：
SQL> oradebug setospid 24109
Oracle pid: 27, Unix process pid: 24109, image: oracle@11gdb (TNS V1-V3)
SQL>  oradebug unlimit
Statement processed.
SQL> oradebug dump systemstate 258
Statement processed.
SQL>  oradebug dump systemstate 258
Statement processed.
SQL> exit




4、繼續分析dump出來的trace檔案
 ----------------------------------------
    SO: 0xa6930740, type: 4, owner: 0xa9a861d0, flag: INIT/-/-/0x00 if: 0x3 c: 0x3
     proc=0xa9a861d0, name=session, file=ksu.h LINE:12729, pg=0
    (session) sid: 1 ser: 19 trans: 0x7268d430, creator: 0xa9a861d0
              flags: (0x8100041) USR/- flags_idl: (0x1) BSY/-/-/-/-/-
              flags2: (0x48009) -/DDLT2/INC
              DID: , short-term DID: 
              txn branch: (nil)
              edition#: 100              oct: 41, prv: 0, sql: 0x2b596c77fdf0, psql: 0xab2eaf78, user: 0/SYS
    ksuxds FALSE at location: 0
    service name: SYS$USERS
    client details:
      O/S info: user: oracle, term: pts/0, ospid: 24108
      machine: 11gdb program: sqlplus@11gdb (TNS V1-V3)
      application name: sqlplus@11gdb (TNS V1-V3), hash value=2572252297
    Current Wait Stack:
     0: waiting for 'enq: TS - contention'                       <<=============當前等待'enq: TS - contention'
        name|mode=0x54530006, tablespace ID=0x3, dba=0x1
        wait_id=412 seq_num=413 snap_id=1
        wait times: snap=16 min 39 sec, exc=16 min 39 sec, total=16 min 39 sec
        wait times: max=infinite, heur=16 min 39 sec
        wait counts: calls=334 os=334
        in_wait=1 iflags=0x15a0
    There is at least one session blocking this session.
      Dumping 1 direct blocker(s):
        inst: 1, sid: 13, ser: 1                     <<=============堵塞源為sid: 13 
      Dumping final blocker:
        inst: 1, sid: 13, ser: 1
    Wait State:
      fixed_waits=0 flags=0x2b boundary=0xa6932628/0
    Session Wait History:
        elapsed time of 23586231 min 16 sec since current wait
     0: waited for 'ksdxexeotherwait'
        =0x0, =0x0, =0x0
        wait_id=436 seq_num=437 snap_id=1
        wait times: snap=0.021888 sec, exc=0.021888 sec, total=0.021888 sec
        wait times: max=30.000000 sec
        wait counts: calls=0 os=0
        occurred after 0.000000 sec of elapsed time
     1: waited for 'ksdxexeotherwait'
        =0x0, =0x0, =0x0
        wait_id=435 seq_num=436 snap_id=1
        wait times: snap=0.025816 sec, exc=0.025816 sec, total=0.025816 sec
        wait times: max=30.000000 sec
        wait counts: calls=0 os=0
        occurred after 0.000000 sec of elapsed time
。。。。。。。。。。
    Process Group: DEFAULT, pseudo proc: 0xa836fac8
    O/S info: user: oracle, term: UNKNOWN, ospid: 24109 
    OSD pid info: Unix process pid: 24109, image: oracle@11gdb (TNS V1-V3)
    Short stack dump: 
ksedsts()+465

分析：會話當前等待'enq: TS - contention'，且call stack中有函式ktsttdrop，符合Bug 15913577，
該BUG影響12.2以下的所有系統平臺的資料庫。
        
5、檢視SID: 13對應的程式是什麼
SQL> select spid from v$process where addr = (
  2   select paddr from v$session where sid = 13);


SPID
------------------------
23843


SQL> !ps -ef |grep 23843
oracle   23843     1  0 14:41 ?        00:00:00 ora_smon_ora11gdb
oracle   24596 24422  0 17:49 pts/1    00:00:00 /bin/bash -c ps -ef |grep 23843


分析總結：
SMON程式堵了刪除臨時表空間會話，會話當前等待'enq: TS - contention'，且call stack中有函式ktsttdrop，符合Bug 15913577，
採取臨時措施，重新sqlplus在刪除表空間成功。

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/25964700/viewspace-1338961/，如需轉載，請註明出處，否則將追究法律責任。