DBMS_STATS收集子分区表导致library cache lock等待

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标题:DBMS_STATS收集子分区表导致library cache lock等待

作者:惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

有客户反馈一个问题,业务中有一张表无论是查询还是dml操作都非常慢,让我们介入分析
数据库版本
打上了170814比较新的psu

[oracle@xffdb1 ~]$ $ORACLE_HOME/OPatch/opatch lsinventory

Oracle 中间补丁程序安装程序版本 11.2.0.3.15
版权所有 (c) 2018, Oracle Corporation。保留所有权利。


Oracle Home       : /u01/app/oracle/product/11.2.0/db_1
Central Inventory : /u01/app/oraInventory
   from           : /u01/app/oracle/product/11.2.0/db_1/oraInst.loc
OPatch version    : 11.2.0.3.15
OUI version       : 11.2.0.4.0
Log file location : /u01/app/oracle/product/11.2.0/db_1/cfgtoollogs/opatch/opatch2018-01-06_16-20-22下午_1.log


--------------------------------------------------------------------------------
Local Machine Information::
Hostname: xffdb1
ARU platform id: 226
ARU platform description:: Linux x86-64

已安装的顶级产品 (1):

Oracle Database 11g                                                  11.2.0.4.0
此 Oracle 主目录中已安装 1 个产品。


中间补丁程序 (2) :

Patch  26609929     : applied on Fri Sep 15 14:28:51 CST 2017
Unique Patch ID:  21482966
Patch description:  "OCW Patch Set Update : 11.2.0.4.170814 (26609929)"

Patch  26609445     : applied on Fri Sep 15 14:28:04 CST 2017
Unique Patch ID:  21482382
Patch description:  "Database Patch Set Update : 11.2.0.4.170814 (26609445)"

awr数据结果
20180203235626
20180203235701


这里显示大量的library cache lock等待
做systemstate分析

                    Resource Holder State
   LOCK: Handle=0x325d938e08    74: 74: is waiting for PIN: Handle=0x325d938e08
    Enq TX-00E0001B-000004D3   488: 488: is waiting for 74:
              Mutex 1e7fbf6c   322: 322: is waiting for 74:
    Enq TX-02850009-00000086   630: 630: is waiting for 74:
    Enq TX-02BC000A-0000009E    ??? Blocker
    Enq TX-0075000E-000010BE    ??? Blocker
    PIN: Handle=0x325d938e08    ??? Blocker
    Enq TX-049A000C-00000002    ??? Blocker
    Enq TX-034C001D-00000038    ??? Blocker
    Enq TX-052C0012-00000002   669: 669: is waiting for 74:
    Enq TX-04620004-00000003    ??? Blocker
    Enq TX-009B0020-00000DA6    ??? Blocker
              Mutex af4db5a8   242: 242: is waiting for 74:
    Enq TX-041E0002-00000005    ??? Blocker
              Mutex 663b253d   727: 727: is waiting for 74:
    Enq TX-04FA0008-00000003   124: 124: is waiting for 69:
    Enq TX-031D0010-0000005B    ??? Blocker
    Enq TX-02BB0004-000000A2    ??? Blocker
    Enq TX-0248001A-000000CD    69: 69: is waiting for Enq TX-02BC000A-0000009E
    Enq TX-03D70008-00000002    ??? Blocker
    Enq TX-02B1001D-00000081    ??? Blocker
    Enq TX-0423001A-00000003    ??? Blocker
    Enq TX-051A0007-00000003   506: 506: is waiting for 74:
              Mutex 2aceb8e9   602: 602: is waiting for 74:
              Mutex c6b2e0f4   196: 196: is waiting for 74:
    Enq TX-00A30020-0000055A    ??? Blocker
    Enq TX-00D70015-00000315    ??? Blocker
    Enq TX-03B30006-00000012    ??? Blocker
    Enq TX-008C0003-00001005    ??? Blocker
    Enq TX-05470014-00000006   219: 219: is waiting for 74:
    Enq TX-054E0018-00000006   673: 673: is waiting for 74:
              Mutex f28c06f8   279: 279: is waiting for 74:
    Enq TX-03D30012-00000002    ??? Blocker
    Enq TX-055C001B-00000005   333: 333: is waiting for Enq TX-01CF000B-00000B2F

              Mutex 2ff03da9   276: 276: is waiting for 74:
    Enq TX-030A000A-000000B6    ??? Blocker
    Enq TX-00530004-000023DF   212: 212: is waiting for 74:
    Enq TX-05550017-00000002   469: 469: is waiting for 74:
              Mutex 724ba5e3   177: 177: is waiting for 74:
    Enq TX-03C10007-00000015    ??? Blocker
    Enq TX-02E30006-00000079    ??? Blocker
                       IPC 6      6 Blocker
    Enq TX-0289000B-0000005F   449: 449: is waiting for 74:
    Enq TX-021E0002-000001DA    ??? Blocker
              Mutex a9fcc7b8   131: 131: is waiting for 74:
    Enq TX-0483001F-00000009    ??? Blocker
    Enq TX-00800010-00000BA0    ??? Blocker
              Mutex c0af249e   666: 666: is waiting for 74:
              Mutex 94389ed4    78: 78: is waiting for 74:
              Mutex 4ac40611   143: 143: is waiting for 74:
              Mutex 24c1c387   168: 168: is waiting for 74:
              Mutex 930636c9   752: 752: is waiting for 74:
    Enq TX-04660001-00000003    ??? Blocker
    Enq TX-01B6000A-00000022    ??? Blocker
    Enq TX-0166000F-000002C7    ??? Blocker
    Enq TX-02FF0008-000000A1    ??? Blocker
    Enq TX-01E10001-00000023    ??? Blocker
    Enq TX-0327000E-0000009E    ??? Blocker
    Enq TX-05120016-00000002   615: 615: is waiting for 74:
    Enq TX-039F001D-00000011    ??? Blocker
    Enq TX-01CF000B-00000B2F    ??? Blocker
    Enq TX-01130020-000001B6    ??? Blocker
    Enq TX-052A0021-00000002   635: 635: is waiting for 74:
              Mutex ebf68fee   579: 579: is waiting for 74:
    Enq TX-02350017-000000D6    ??? Blocker
    Enq TX-00BB0000-00000598    ??? Blocker
    Enq TX-0443000E-00000003    ??? Blocker
              Mutex e7bae014   344: 344: is waiting for 74:
              Mutex fe251793   616: 616: is waiting for 74:
              Mutex 750494ae   180: 180: is waiting for 74:
    Enq TX-01230010-000001C0    ??? Blocker
    Enq TX-0543001C-00000003   119: 119: is waiting for 124:
    Enq TX-04E60014-00000005    ??? Blocker
    Enq TX-00F1000A-000002AB    ??? Blocker
              Mutex aa83fbd7   651: 651: is waiting for 74:
    Enq TX-058A0002-00000003    ??? Blocker
    Enq TX-03B00016-0000000F    ??? Blocker
              Mutex 26e065a4   150: 150: is waiting for 74:
    Enq TX-0219001B-000001BE    ??? Blocker
    Enq TX-00B9001D-00000069    ??? Blocker
    Enq TX-01110020-00000198    ??? Blocker
    Enq TX-04F3001B-00000002    ??? Blocker
    Enq TX-04A60015-00000002    ??? Blocker
    Enq TX-02D30015-0000008A    ??? Blocker
    Enq TX-01540018-000001B7    ??? Blocker
    Enq TX-02240019-0000001C    ??? Blocker
              Mutex e595002d   502: 502: is waiting for 74:
              Mutex 1661a4cb   732: 732: is waiting for 74:
    Enq TX-00320010-00003A12    ??? Blocker
    Enq TX-020F001F-00000027    ??? Blocker
    Enq TX-0387000A-0000004D   515: 515: is waiting for 74:
    Enq TX-01260014-0000012D    ??? Blocker
    Enq TX-02EE001D-0000005F    ??? Blocker
    Enq TX-004A0001-00000882   603: 603: is waiting for Enq TX-02240019-0000001C

              Mutex 4a18a781   258: 258: is waiting for 74:
   LOCK: Handle=0x325aa4c428   643: 643: is waiting for 74:
    Enq TX-037A0002-0000006E   118: 118: is waiting for 74:
    Enq TX-02460020-0000006D   493: 493: is waiting for Enq TX-00F1000A-000002AB


PROCESS 74: J000
  ----------------------------------------
  SO: 0x31a2b2e440, type: 2, owner: (nil), flag: INIT/-/-/0x00 if: 0x3 c: 0x3
   proc=0x31a2b2e440, name=process, file=ksu.h LINE:12721, pg=0
  (process) Oracle pid:74, ser:153, calls cur/top: 0x305d24c378/0x305f3f5eb0
            flags : (0x0) -
            flags2: (0x10),  flags3: (0x10) 
            intr error: 0, call error: 0, sess error: 0, txn error 0
            intr queue: empty
    ksudlp FALSE at location: 0
  (post info) last post received: 0 0 80
              last post received-location: kji.h LINE:3691 ID:kjata: wake up enqueue owner
              last process to post me: 0x3182a6fca0 1 6
              last post sent: 0 0 26
              last post sent-location: ksa2.h LINE:285 ID:ksasnd
              last process posted by me: 0x3182a75038 2 6
    (latch info) wait_event=0 bits=0x0
    Process Group: DEFAULT, pseudo proc: 0x3162ddbe90
    O/S info: user: oracle, term: UNKNOWN, ospid: 103036 
    OSD pid info: Unix process pid: 103036, image: oracle@xffdb1 (J000)
    Short stack dump: 
      ksedsts()+465<-ksdxfstk()+32<-ksdxcb()+1927<-sspuser()+112<-__sighandler()<-semtimedop()+10
      <-skgpwwait()+178<-ksliwat()+2046<-kslwaitctx()+163<-kjusuc()+3400
      <-ksipgetctxi()+1759<-kqlmPin()+2943<-kqlmClusterLock()+237<-kglpnal()+4072
      <-kglpin()+1381<-qostobkglcrt1()+640<-qostobkglcrt()+255<-qospsts()+1639
      <-spefcmpa()+196<-spefmccallstd()+235<-pextproc()+41<-peftrusted()+150
      <-psdexsp()+255<-rpiswu2()+1776<-psdextp()+700<-pefccal()+726<-pefcal()+224
      <-pevm_FCAL()+169<-pfrinstr_FCAL()+75<-pfrrun_no_tool()+63<-pfrrun()+627
      <-plsql_run()+649<-peidxr_run()+263<-peidxexe()+79<-kkxdexe()+338
      <-kkxmpexe()+241<-kgmexwi()+605<-kgmexec()+2193<-evapls()+813
      <-evaopn2()+808<-kkxmexcs()+133<-opiexe()+20880<-kpoal8()+2380
      <-opiodr()+917<-kpoodr()+1401<-upirtrc()+2436<-kpurcsc()+98
      <-kpuexec()+10790<-OCIStmtExecute()+39<-jslvec_execcb1()+672
      <-jslvswu()+56<-jslve_execute0()+2257<-jslve_execute()+332
      <-rpiswu2()+1776<-kkjex1e()+379<-kkjsexe()+711<-kkjrdp()+694
      <-opirip()+958<-opidrv()+603<-sou2o()+103<-opimai_real()+250
      <-ssthrdmain()+265<-main()+201<-__libc_start_main()+253


    SO: 0x31c382f010, type: 4, owner: 0x31a2b2e440, flag: INIT/-/-/0x00 if: 0x3 c: 0x3
     proc=0x31a2b2e440, name=session, file=ksu.h LINE:12729, pg=0
    (session) sid: 6001 ser: 679 trans: 0x311e36fa28, creator: 0x31a2b2e440
              flags: (0x8010041) USR/- flags_idl: (0x1) BSY/-/-/-/-/-
              flags2: (0x40009) -/-/INC
              DID: , short-term DID: 
              txn branch: (nil)
              edition#: 100              oct: 170, prv: 0, sql: 0x323de178e8, psql: 0x32b5d0fc98, user: 0/SYS
    ksuxds FALSE at location: 0
    service name: SYS$USERS
    client details:
      O/S info: user: oracle, term: UNKNOWN, ospid: 103036
      machine: xffdb1 program: oracle@xffdb1 (J000)
      application name: DBMS_SCHEDULER, hash value=2478762354
      action name: ORA$AT_OS_OPT_SY_1594, hash value=1524069073
    Current Wait Stack:
     0: waiting for 'library cache pin'
        handle address=0x325d938e08, pin address=0x325baec3e0, 100*mode+namespace=0x850fe00010003
        wait_id=46488 seq_num=46502 snap_id=1
        wait times: snap=6 min 2 sec, exc=6 min 2 sec, total=6 min 2 sec
        wait times: max=15 min 0 sec, heur=6 min 2 sec
        wait counts: calls=727 os=727
        in_wait=1 iflags=0x15a2
    There are 2136 sessions blocked by this session.

发现主要是74号进程阻塞了其他的
做hanganalyze分析

-------------------------------------------------------------------------------
Chain 1:
-------------------------------------------------------------------------------
    Oracle session identified by:
    {
                instance: 1 (xffdb.xffdbsv1)
                   os id: 82310
              process id: 224, oracle@xffdb1
              session id: 4
        session serial #: 12237
    }
    is waiting for 'enq: TX - row lock contention' with wait info:
    {
                      p1: 'name|mode'=0x54580006
                      p2: 'usn<<16 | slot'=0x21e0002
                      p3: 'sequence'=0x1da
            time in wait: 3 min 48 sec
           timeout after: never
                 wait id: 1260
                blocking: 0 sessions
             current sql: UPDATE t_xifenfei subpartition(p201801_s32)
                            SET INDICATORCODE   = :1,
                                LOWERLIMIT      = :2,
                                UPPERLIMIT      = :3,
                                AVGUNITPRICE    = :4,
                                TRADEITEMNAME   = :5,
    
             short stack: ………………
            wait history:
              * time between current wait and wait #1: 0.000220 sec
              1.       event: 'gc cr block 2-way'
                 time waited: 0.000341 sec
                     wait id: 1259            p1: ''=0x6
                                              p2: ''=0x3590
                                              p3: ''=0x44b
              * time between wait #1 and #2: 0.000284 sec
              2.       event: 'gc current block 3-way'
                 time waited: 0.000663 sec
                     wait id: 1258            p1: ''=0xa
                                              p2: ''=0x3ad02
                                              p3: ''=0x2000001
              * time between wait #2 and #3: 0.000383 sec
              3.       event: 'gc cr block 2-way'
                 time waited: 0.000288 sec
                     wait id: 1257            p1: ''=0x5
                                              p2: ''=0x2e20
                                              p3: ''=0x957
    }
    and is blocked by
 => Oracle session identified by:
    {
                instance: 3 (xffdb.xffdbsv3)
                   os id: 39472
              process id: 587, oracle@xffdb3
              session id: 2215
        session serial #: 8213
    }
    which is waiting for 'library cache lock' with wait info:
    {
                      p1: 'handle address'=0x327f5ecea0
                      p2: 'lock address'=0x327a5ab660
                      p3: '100*mode+namespace'=0x850fe00010002
            time in wait: 3 min 43 sec
           timeout after: 11 min 16 sec
                 wait id: 2343
                blocking: 3 sessions
             current sql: SELECT COUNT(*) COUNT
                          FROM t_xifenfei subpartition(p201801_s32)
                         WHERE TRADEITEMID = '679EA6DE428F414D014B3D5EC8DE5E32'
             short stack:  ………………
                 wait history:
              * time between current wait and wait #1: 0.000908 sec
              1.       event: 'SQL*Net message from client'
                 time waited: 0.001074 sec
                     wait id: 2342            p1: 'driver id'=0x54435000
                                              p2: '#bytes'=0x1
              * time between wait #1 and #2: 0.000033 sec
              2.       event: 'SQL*Net message to client'
                 time waited: 0.000003 sec
                     wait id: 2341            p1: 'driver id'=0x54435000
                                              p2: '#bytes'=0x1
              * time between wait #2 and #3: 0.000069 sec
              3.       event: 'SQL*Net message from client'
                 time waited: 0.001232 sec
                     wait id: 2340            p1: 'driver id'=0x54435000
                                              p2: '#bytes'=0x1
    }
    and is blocked by
 => Oracle session identified by:
    {
                instance: 1 (xffdb.xffdbsv1)
                   os id: 103036
              process id: 74, oracle@xffdb1 (J000)
              session id: 6001
        session serial #: 679
    }
    which is waiting for 'library cache pin' with wait info:
    {
                      p1: 'handle address'=0x325d938e08
                      p2: 'pin address'=0x325baec3e0
                      p3: '100*mode+namespace'=0x850fe00010003
            time in wait: 3 min 47 sec
           timeout after: 11 min 12 sec
                 wait id: 46488
                blocking: 2099 sessions
             current sql: call dbms_stats.gather_database_stats_job_proc (  )
             short stack: …………
            wait history:
              * time between current wait and wait #1: 0.000038 sec
              1.       event: 'library cache lock'
                 time waited: 0.012353 sec
                     wait id: 46487           p1: 'handle address'=0x325d938e08
                                              p2: 'lock address'=0x3259aee680
                                              p3: '100*mode+namespace'=0x850fe00010003
              * time between wait #1 and #2: 0.002509 sec
              2.       event: 'enq: IV -  contention'
                 time waited: 0.001079 sec
                     wait id: 46486           p1: 'type|mode'=0x49560005
                                              p2: 'id1'=0x53594e43
                                              p3: 'id2'=0x15
              * time between wait #2 and #3: 0.000085 sec
              3.       event: 'enq: IV -  contention'
                 time waited: 0.001817 sec
                     wait id: 46485           p1: 'type|mode'=0x49560005
                                              p2: 'id1'=0x4c4f434b
                                              p3: 'id2'=0x15
    }
 
Chain 1 Signature: 'library cache pin'<='library cache lock'<='enq: TX - row lock contention'
Chain 1 Signature Hash: 0xa08ff7bf

到这里基本上可以确定是由于自动任务收集统计信息导致系统出现大量的library cache lock和library cache pin,另外可以确定大部分被阻塞在library cache 相关的select和dml语句都集中在t_xifenfei这个子分区表中,通过查询mos,发现相关bug:Bug 19790972 – “library cache lock” waits due to DBMS_STATS gather of stats for a subpartition
20180204002507


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