今天在进行数据库性能调优过程中，突然翻到了之前一封邮件，信息如下：
从日志中看，发现存在行级排他锁存在争用以致产生了死锁。
问题描述：
*** 2013-12-02 17:03:10.148
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-000b002b-002be2d3 61 958 X 141 876 X
TX-0009001c-000d5ffa 141 876 X 61 958 X
session 958: DID 0001-003D-00001BC1 session 876: DID 0001-008D-0000B424
session 876: DID 0001-008D-0000B424 session 958: DID 0001-003D-00001BC1
Rows waited on:
Session 876: obj - rowid = 0000DE75 - AAAN51AArAAAA6mAAO
(dictionary objn - 56949, file - 43, block - 3750, slot - 14)
Session 958: obj - rowid = 00014F07 - AAAU8HABXAAA7BqAAI
(dictionary objn - 85767, file - 87, block - 241770, slot - 8)
Information on the OTHER waiting sessions:
Session 876:
sid: 876 ser: 38057 audsid: 7879846 user: 47/EPMFRAMEWORK
flags: (0x41) USR/- flags_idl: (0x1) BSY/-/-/-/-/-
flags2: (0x8)
pid: 141 O/S info: user: orarep, term: UNKNOWN, ospid: 11195
image: oracle@pmsdb2
O/S info: user: webpms2, term: unknown, ospid: 1234, machine: pmsrep1
program: JDBC Thin Client
application name: JDBC Thin Client, hash value=2546894660
Current SQL Statement:
UPDATE AP_COLL_INFO_T T SET T.PROCINST_ID = NULL, T.IF_PROJECT_INHERITED = '0' WHERE T.INVEST_SNO = :1
End of information on OTHER waiting sessions.
Current SQL statement for this session:
UPDATE AP_PROJECT_INFO_EDITION_T T SET T.IF_INHERITED='1' WHERE T.AP_PRJ_SNO=:1
在上面可以获得很多可以帮助诊断问题的信息，该信息显示由于应用逻辑错误，导致了死锁的产生。
另外还可以通过相关sql获得一些简要信息：
eg： - 2、分解rowid获得产生死锁等待的对象信息如下：
- <span style="color:#000000;">SQL> select a.owner,
- 2 a.object_name,
- 3 a.object_type,
- 4 a.last_ddl_time,
- 5 a.created,
- 6 a.status,
- 7 b.object,
- 8 b.fno,
- 9 b.rownu,
- 10 b.block
- 11 from (select dbms_rowid.rowid_object('AAAU8HABXAAA7BqAAI') object,
- 12 dbms_rowid.rowid_relative_fno('AAAU8HABXAAA7BqAAI') fno,
- 13 dbms_rowid.rowid_row_number('AAAU8HABXAAA7BqAAI') rowNU,
- 14 dbms_rowid.rowid_block_number('AAAU8HABXAAA7BqAAI') block
- 15 from dual) b,
- 16 dba_objects a
- 17 where a.object_id = b.object;
- </span>OWNER OBJECT_NAME OBJECT_TYPE LAST_DDL_TIME CREATED STATUS OBJECT FNO ROWNU BLOCK
- ------------------------------ -------------------------------------------------------------------------------- ------------------- ------------- ----------- ------- ---------- ---------- ---------- ----------
- EPMFRAMEWORK AP_PROJECT_INFO_EDITION_T TABLE 2013-11-27 11 2012-06-05 VALID 85767 87 8 241770
- <span style="color:#000000;">SQL>
- SQL> select a.owner,
- 2 a.object_name,
- 3 a.object_type,
- 4 a.last_ddl_time,
- 5 a.created,
- 6 a.status,
- 7 b.object,
- 8 b.fno,
- 9 b.rownu,
- 10 b.block
- 11 from (select dbms_rowid.rowid_object('AAAN51AArAAAA6mAAO') object,
- 12 dbms_rowid.rowid_relative_fno('AAAN51AArAAAA6mAAO') fno,
- 13 dbms_rowid.rowid_row_number('AAAN51AArAAAA6mAAO') rowNU,
- 14 dbms_rowid.rowid_block_number('AAAN51AArAAAA6mAAO') block
- 15 from dual) b,
- 16 dba_objects a
- 17 where a.object_id = b.object;
- </span>OWNER OBJECT_NAME OBJECT_TYPE LAST_DDL_TIME CREATED STATUS OBJECT FNO ROWNU BLOCK
- ------------------------------ -------------------------------------------------------------------------------- ------------------- ------------- ----------- ------- ---------- ---------- ---------- ----------
- EPMFRAMEWORK AP_COLL_INFO_T TABLE 2012-04-01 21 2011-10-05 VALID 56949 43 14 3750
- SQL>
- <span style="color:#000000;">3、导致此问题的sql语句为：
- SQL> SELECT B.SQL_ID,SQL_FULLTEXT,B.EVENT,B.SAMPLE_TIME,B.SESSION_ID FROM V$sqL A INNER JOIN (
- 2 select session_id, session_serial#, sql_id, event, SAMPLE_TIME
- 3 from dba_hist_active_sess_history
- 4 where event = 'enq: TX - row lock contention'
- 5 and sample_time >
- 6 to_date('2013-12-02 17:02:00', 'YYYY-MM-DD HH24:MI:SS') ) B
- 7 ON A.SQL_ID=B.SQL_ID;
- SQL_ID SQL_FULLTEXT </span> EVENT SAMPLE_TIME SESSION_ID
- ------------- -------------------------------------------------------------------------------------------------------------- ---------------------------------------------------------------- -------------------------------------------------------------------------------- ----------
- 9bwcgrn96cx62 INSERT INTO rt_actinst_data(instance_id,name,type,data,merge_type,rdata_app)VALUES(:1,:2,:3,:4,:5,:6) enq: TX - row lock contention 02-12月-13 05.03.21.158 下午 959
- 9bwcgrn96cx62 INSERT INTO rt_actinst_data(instance_id,name,type,data,merge_type,rdata_app)VALUES(:1,:2,:3,:4,:5,:6) enq: TX - row lock contention 02-12月-13 05.03.11.158 下午 959
- 1npq5jnavnc0k UPDATE AP_PROJECT_INFO_EDITION_T T SET T.IF_INHERITED='1' WHERE T.AP_PRJ_SNO=:1 enq: TX - row lock contention 02-12月-13 05.03.01.153 下午 958
- 9bwcgrn96cx62 INSERT INTO rt_actinst_data(instance_id,name,type,data,merge_type,rdata_app)VALUES(:1,:2,:3,:4,:5,:6) enq: TX - row lock contention 02-12月-13 05.03.01.153 下午 959
- 1npq5jnavnc0k UPDATE AP_PROJECT_INFO_EDITION_T T SET T.IF_INHERITED='1' WHERE T.AP_PRJ_SNO=:1 enq: TX - row lock contention 02-12月-13 05.02.51.148 下午 958
- 1npq5jnavnc0k UPDATE AP_PROJECT_INFO_EDITION_T T SET T.IF_INHERITED='1' WHERE T.AP_PRJ_SNO=:1 enq: TX - row lock contention 02-12月-13 05.02.41.148 下午 958
- 1npq5jnavnc0k UPDATE AP_PROJECT_INFO_EDITION_T T SET T.IF_INHERITED='1' WHERE T.AP_PRJ_SNO=:1 enq: TX - row lock contention 02-12月-13 05.02.31.148 下午 958
- 7 rows selected
- SQL>
我要说的是在trace中可以获得一个deadlock graph:
看个例子：
 那么本次锁的最后组合为：tx x x； 最后总结一下（一见明了）：  该贴由koei123转至本版2015-6-1 14:57:12
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2015-3-26 9:57:13 |
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