Vik*_*ntY 10
一种可能的方法是将INIT.ORA参数distributed_lock_timeout增加到更大的值.这将使您有更长的时间来观察v$lock表,因为锁会持续更长时间.
要实现这一目标的自动化,您可以
每5-10秒运行一次SQL作业,将v$locksandos上面给出的值或查询的值记录到表中,然后分析它以查看导致锁定的会话.
运行STATSPACK或AWR报告.被锁定的会话应该显示出很长的时间,因此可以被识别.
v$session还有3个列blocking_instance, blocking_session, blocking_session_status可以添加到上面的查询中,以提供锁定内容的图片.
使用此查询来确定可能的阻塞锁:
SELECT se.username,
NULL,
se.sid,
DECODE( se.command,
0, 'No command',
1, 'CREATE TABLE',
2, 'INSERT',
3, 'SELECT',
4, 'CREATE CLUSTER',
5, 'ALTER CLUSTER',
6, 'UPDATE',
7, 'DELETE',
8, 'DROP CLUSTER',
9, 'CREATE INDEX',
10, 'DROP INDEX',
11, 'ALTER INDEX',
12, 'DROP TABLE',
13, 'CREATE SEQUENCE',
14, 'ALTER SEQUENCE',
15, 'ALTER TABLE',
16, 'DROP SEQUENCE',
17, 'GRANT',
18, 'REVOKE',
19, 'CREATE SYNONYM',
20, 'DROP SYNONYM',
21, 'CREATE VIEW',
22, 'DROP VIEW',
23, 'VALIDATE INDEX',
24, 'CREATE PROCEDURE',
25, 'ALTER PROCEDURE',
26, 'LOCK TABLE',
27, 'NO OPERATION',
28, 'RENAME',
29, 'COMMENT',
30, 'AUDIT',
31, 'NOAUDIT',
32, 'CREATE DATABASE LINK',
33, 'DROP DATABASE LINK',
34, 'CREATE DATABASE',
35, 'ALTER DATABASE',
36, 'CREATE ROLLBACK SEGMENT',
37, 'ALTER ROLLBACK SEGMENT',
38, 'DROP ROLLBACK SEGMENT',
39, 'CREATE TABLESPACE',
40, 'ALTER TABLESPACE',
41, 'DROP TABLESPACE',
42, 'ALTER SESSION',
43, 'ALTER USER',
44, 'COMMIT',
45, 'ROLLBACK',
46, 'SAVEPOINT',
47, 'PL/SQL EXECUTE',
48, 'SET TRANSACTION',
49, 'ALTER SYSTEM SWITCH LOG',
50, 'EXPLAIN',
51, 'CREATE USER',
52, 'CREATE ROLE',
53, 'DROP USER',
54, 'DROP ROLE',
55, 'SET ROLE',
56, 'CREATE SCHEMA',
57, 'CREATE CONTROL FILE',
58, 'ALTER TRACING',
59, 'CREATE TRIGGER',
60, 'ALTER TRIGGER',
61, 'DROP TRIGGER',
62, 'ANALYZE TABLE',
63, 'ANALYZE INDEX',
64, 'ANALYZE CLUSTER',
65, 'CREATE PROFILE',
67, 'DROP PROFILE',
68, 'ALTER PROFILE',
69, 'DROP PROCEDURE',
70, 'ALTER RESOURCE COST',
71, 'CREATE SNAPSHOT LOG',
72, 'ALTER SNAPSHOT LOG',
73, 'DROP SNAPSHOT LOG',
74, 'CREATE SNAPSHOT',
75, 'ALTER SNAPSHOT',
76, 'DROP SNAPSHOT',
79, 'ALTER ROLE',
85, 'TRUNCATE TABLE',
86, 'TRUNCATE CLUSTER',
88, 'ALTER VIEW',
91, 'CREATE FUNCTION',
92, 'ALTER FUNCTION',
93, 'DROP FUNCTION',
94, 'CREATE PACKAGE',
95, 'ALTER PACKAGE',
96, 'DROP PACKAGE',
97, 'CREATE PACKAGE BODY',
98, 'ALTER PACKAGE BODY',
99, 'DROP PACKAGE BODY',
TO_CHAR(se.command) ) command,
DECODE(lo.type,
'MR', 'Media Recovery',
'RT', 'Redo Thread',
'UN', 'User Name',
'TX', 'Transaction',
'TM', 'DML',
'UL', 'PL/SQL User Lock',
'DX', 'Distributed Xaction',
'CF', 'Control File',
'IS', 'Instance State',
'FS', 'File Set',
'IR', 'Instance Recovery',
'ST', 'Disk Space Transaction',
'TS', 'Temp Segment',
'IV', 'Library Cache Invalidation',
'LS', 'Log Start or Switch',
'RW', 'Row Wait',
'SQ', 'Sequence Number',
'TE', 'Extend Table',
'TT', 'Temp Table',
'JQ', 'Job Queue',
lo.type) ltype,
DECODE( lo.lmode,
0, 'NONE', /* Mon Lock equivalent */
1, 'Null Mode', /* N */
2, 'Row-S (SS)', /* L */
3, 'Row-X (SX)', /* R */
4, 'Share (S)', /* S */
5, 'S/Row-X (SSX)', /* C */
6, 'Excl (X)', /* X */
lo.lmode) lmode,
DECODE( lo.request,
0, 'NONE', /* Mon Lock equivalent */
1, 'Null', /* N */
2, 'Row-S (SS)', /* L */
3, 'Row-X (SX)', /* R */
4, 'Share (S)', /* S */
5, 'S/Row-X (SSX)', /* C */
6, 'Excl (X)', /* X */
TO_CHAR(lo.request)) request,
lo.ctime ctime,
DECODE(lo.block,
0, 'No Block',
1, 'Blocking',
2, 'Global',
TO_CHAR(lo.block)) blkothr,
'SYS' owner,
ro.name image
FROM v$lock lo,
v$session se,
v$transaction tr,
v$rollname ro
WHERE se.sid = lo.sid
AND se.taddr = tr.addr(+)
AND tr.xidusn = ro.usn(+)
ORDER BY sid