[20180801]insert导致死锁.txt

[20180801]insert导致死锁.txt

--//链接http://www.itpub.net/thread-2104135-2-1.html的讨论,自己有点疏忽了,插入主键相同也会导致死锁.
--//自己按照链接http://www.xifenfei.com/2011/05/insert%E5%BC%95%E8%B5%B7%E7%9A%84%E6%AD%BB%E9%94%81.html
--//自己测试看看:

1.环境:
SCOTT@test01p> @ ver1
PORT_STRING                    VERSION        BANNER                                                                               CON_ID
------------------------------ -------------- -------------------------------------------------------------------------------- ----------
IBMPC/WIN_NT64-9.1.0           12.1.0.1.0     Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production              0

2.测试:
--//session 1:
SCOTT@test01p> SCOTT@test01p> @ spid
       SID    SERIAL# PROCESS                  SERVER    SPID                     PID  P_SERIAL# C50
---------- ---------- ------------------------ --------- -------------------- ------- ---------- --------------------------------------------------
        86         73 6388:6512                DEDICATED 6448                      57          6 alter system kill session '86,73' immediate;

CREATE TABLE t1(ID NUMBER);
ALTER TABLE t1 ADD primary key (ID);
INSERT INTO t1 VALUES(1);

--//session 2:
SCOTT@test01p> @ spid

SID    SERIAL# PROCESS                  SERVER    SPID                     PID  P_SERIAL# C50
---------- ---------- ------------------------ --------- -------------------- ------- ---------- --------------------------------------------------
       237         59 6988:424                 DEDICATED 5872                      15          6 alter system kill session '237,59' immediate;

INSERT INTO t1 VALUES(2);

--//现在没事没有冲突.
--//回到session 1:
INSERT INTO t1 VALUES(2);

--//挂起,但是没有死锁.
--//回到session 2:
INSERT INTO t1 VALUES(1);

--//session 1出现如下提示:
SCOTT@test01p> INSERT INTO t1 VALUES(2);
INSERT INTO t1 VALUES(2)
*
ERROR at line 1:
ORA-00060: deadlock detected while waiting for resource

--//但是session 2一样会挂起.因为主键冲突还存在.

--//session 1:
SCOTT@test01p> commit ;
Commit complete.

--//session 2:
SCOTT@test01p> INSERT INTO t1 VALUES(1);
INSERT INTO t1 VALUES(1)
*
ERROR at line 1:
ORA-00001: unique constraint (SCOTT.SYS_C0011640) violated

--//提示主键冲突.感觉应该在应用很少出现这样的情况.

3.看看转储:

*** 2018-08-01 20:24:23.459
*** SESSION ID:(86.73) 2018-08-01 20:24:23.459
*** CLIENT ID:() 2018-08-01 20:24:23.459
*** SERVICE NAME:(test01p) 2018-08-01 20:24:23.459
*** MODULE NAME:(SQL*Plus) 2018-08-01 20:24:23.459
*** ACTION NAME:() 2018-08-01 20:24:23.459
*** CONTAINER ID:(3) 2018-08-01 20:24:23.459
 
*** 2018-08-01 20:24:23.459
DEADLOCK DETECTED ( ORA-00060 )
 
[Transaction Deadlock]
 
The following deadlock is not an ORACLE error. It is a
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following

*** 2018-08-01 20:24:23.460
information may aid in determining the deadlock:
 
Deadlock graph:
                                          ---------Blocker(s)--------  ---------Waiter(s)---------
Resource Name                             process session holds waits  process session holds waits
TX-00100015-0000060F-00000000-00000000         57      86     X             15     237           S
TX-00070013-00005F4E-00000000-00000000         15     237     X             57      86           S
 
session 86: DID 0001-0039-00000014    session 237: DID 0001-000F-0000000A
session 237: DID 0001-000F-0000000A    session 86: DID 0001-0039-00000014
 
Rows waited on:
  Session 86: no row
  ~~~~~~~~~~~~~~~~~~~
  Session 237: no row
 ~~~~~~~~~~~~~~~~~~~~
----- Information for the OTHER waiting sessions -----
Session 237:
  sid: 237 ser: 59 audsid: 26211525 user: 109/SCOTT
  pdb: 3/TEST01P
    flags: (0x100045) USR/- flags_idl: (0x1) BSY/-/-/-/-/-
    flags2: (0x40009) -/-/INC
  pid: 15 O/S info: user: oracle, term: XXX, ospid: 5872
    image: ORACLE.EXE (SHAD)
  client details:
    O/S info: user: XXX\Administrator, term: XXX, ospid: 6988:424
    machine: WORKGROUP\XXX program: sqlplus.exe
    application name: SQL*Plus, hash value=3669949024
  current SQL:
  INSERT INTO t1 VALUES(1)
 
----- End of information for the OTHER waiting sessions -----
 
Information for THIS session:
 
----- Current SQL Statement for this session (sql_id=0s3pjym30ya3w) -----
INSERT INTO t1 VALUES(2)
===================================================
--//太长..
--//链接http://www.itpub.net/thread-2104135-1-1.html比较牛,有4个会话串在一起.
--//实际上我自己有点疑惑的地方:
Rows waited on:
  Session 86: no row
  Session 237: no row

--//no row,按照道理应该有行记录.没想到主键冲突会出现这样的情况.
--//链接的错误应该类似这样:

--//sesion 1:
SCOTT@test01p(86,73)> INSERT INTO t1 VALUES(1);
1 row created.

--//sesion 2:
SCOTT@test01p(237,59)> INSERT INTO t1 VALUES(2);
1 row created.

--//sesion 3:
SCOTT@test01p(161,69)> INSERT INTO t1 VALUES(3);
1 row created.

--//sesion 4:
SCOTT@test01p(156,71)> INSERT INTO t1 VALUES(4);
1 row created.

--//然后分别插入,就会分别挂起!!
--//sesion 1:
SCOTT@test01p(86,73)> INSERT INTO t1 VALUES(2);

--//sesion 2:
SCOTT@test01p(237,59)> INSERT INTO t1 VALUES(3);

--//sesion 3:
SCOTT@test01p(161,69)> INSERT INTO t1 VALUES(4);

--//sesion 4:
SCOTT@test01p(156,71)> INSERT INTO t1 VALUES(1);

*** 2018-08-01 20:50:46.479
DEADLOCK DETECTED ( ORA-00060 )
 
[Transaction Deadlock]
 
The following deadlock is not an ORACLE error. It is a
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
 
Deadlock graph:
                                          ---------Blocker(s)--------  ---------Waiter(s)---------
Resource Name                             process session holds waits  process session holds waits
TX-000B0005-000013E2-00000000-00000000         57      86     X             58     156           S
TX-000A0007-000065E1-00000000-00000000         58     156     X             38     161           S
TX-00090002-00006203-00000000-00000000         38     161     X             15     237           S
TX-000F001B-00000835-00000000-00000000         15     237     X             57      86           S
 
session 86: DID 0001-0039-00000014    session 156: DID 0001-003A-0000000A
session 156: DID 0001-003A-0000000A    session 161: DID 0001-0026-0000005B
session 161: DID 0001-0026-0000005B    session 237: DID 0001-000F-0000000A
session 237: DID 0001-000F-0000000A    session 86: DID 0001-0039-00000014
 
Rows waited on:
  Session 86: no row
  Session 156: no row
  Session 161: no row
  Session 237: no row

--//session 1(86)  阻塞 session 4(156)
--//session 4(156) 阻塞 session 3(161)
--//session 3(161) 阻塞 session 2(237)
--//session 2(237) 阻塞 session 1(86)
--//这样就形成环.
--//不过好像对方的情况更复杂!!