Oracle诊断案例：Job任务停止执行

　　摘要:

　　本文通过一次Oracle Job任务异常案例诊断，分析其原因及解决过程，从内部揭示Oracle Job任务调度及内部计时机制。

　　问题及环境

　　接到研发人员报告，数据库定时任务未正常执行，导致某些操作失败。

　　开始介入处理该事故.

　　系统环境:

SunOS DB 5.8 Generic_108528-21 sun4u sparc SUNW,Ultra-4 Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

　　解决过程

　　首先介入检查数据库任务

$ sqlplus "/ as sysdba" SQL*Plus: Release 9.2.0.3.0 - Production on Wed Nov 17 20:23:53 2004 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. Connected to: Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production 文章来源于www.hot007.com With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.3.0 - Production SQL> select job,last_date,last_sec,next_date,next_sec,broken,failures from dba_jobs; JOB LAST_DATE LAST_SEC NEXT_DATE NEXT_SEC B FAILURES INTERVAL ---------- --------- ---------------- --------- ---------------- - ---------- ---------------------------- 31 16-NOV-04 01:00:02 17-NOV-04 01:00:00 N 0 trunc(sysdate 1) 1/24 27 16-NOV-04 00:00:04 17-NOV-04 00:00:00 N 0 TRUNC(SYSDATE) 1 35 16-NOV-04 01:00:02 17-NOV-04 01:00:00 N 0 trunc(sysdate 1) 1/24 29 16-NOV-04 00:00:04 17-NOV-04 00:00:00 N 0 TRUNC(SYSDATE) 1 30 01-NOV-04 06:00:01 01-DEC-04 06:00:00 N 0 trunc(add_months(sysdate,1),’MM’) 6/24 65 16-NOV-04 04:00:03 17-NOV-04 04:00:00 N 0 trunc(sysdate 1) 4/24 46 16-NOV-04 02:14:27 17-NOV-04 02:14:27 N 0 sysdate 1 66 16-NOV-04 03:00:02 17-NOV-04 18:14:49 N 0 trunc(sysdate 1) 3/24 www.jc567.cn 8 rows selected.

　　发现JOB任务是都没有正常执行，最早一个应该在17-NOV-04 01:00:00执行。但是没有执行。

　　建立测试JOB

create or replace PROCEDURE pining IS BEGIN NULL; END; / variable jobno number; variable instno number; begin select instance_number into :instno from v$instance; dbms_job.submit(:jobno, ’pining;’, trunc(sysdate 1/288,’MI’), ’trunc(SYSDATE 1/288,’’MI’’)’, TRUE, :instno); end; /

　　发现同样的，不执行。

　　但是通过dbms_job.run(<job>)执行没有任何问题。

　　进行恢复尝试

　　怀疑是CJQ0进程失效，首先设置JOB_QUEUE_PROCESSES为0，Oracle会杀掉CJQ0及相应job进程

SQL> ALTER SYSTEM SET JOB_QUEUE_PROCESSES = 0;

　　等2~3分钟，重新设置

SQL> ALTER SYSTEM SET JOB_QUEUE_PROCESSES = 5;

　　此时PMON会重起CJQ0进程

Thu Nov 18 11:59:50 2004 ALTER SYSTEM SET job_queue_processes=0 SCOPE=MEMORY; Thu Nov 18 12:01:30 2004 ALTER SYSTEM SET job_queue_processes=10 SCOPE=MEMORY; Thu Nov 18 12:01:30 2004 Restarting dead background process CJQ0 CJQ0 started with pid=8 但是Job仍然不执行，而且在再次修改的时候，CJQ0直接死掉了。 www.jc567.cn Thu Nov 18 13:52:05 2004 ALTER SYSTEM SET job_queue_processes=0 SCOPE=MEMORY; Thu Nov 18 14:09:30 2004 ALTER SYSTEM SET job_queue_processes=10 SCOPE=MEMORY; Thu Nov 18 14:10:27 2004 ALTER SYSTEM SET job_queue_processes=0 SCOPE=MEMORY; Thu Nov 18 14:10:42 2004 ALTER SYSTEM SET job_queue_processes=10 SCOPE=MEMORY; Thu Nov 18 14:31:07 2004 ALTER SYSTEM SET job_queue_processes=0 SCOPE=MEMORY; Thu Nov 18 14:40:14 2004 ALTER SYSTEM SET job_queue_processes=10 SCOPE=MEMORY; Thu Nov 18 14:40:28 2004 ALTER SYSTEM SET job_queue_processes=0 SCOPE=MEMORY; Thu Nov 18 14:40:33 2004 ALTER SYSTEM SET job_queue_processes=1 SCOPE=MEMORY; Thu Nov 18 14:40:40 2004 ALTER SYSTEM SET job_queue_processes=10 SCOPE=MEMORY; Thu Nov 18 15:00:42 2004 ALTER SYSTEM SET job_queue_processes=0 SCOPE=MEMORY; Thu Nov 18 15:01:36 2004 ALTER SYSTEM SET job_queue_processes=15 SCOPE=MEMORY;

www.jc567.cn
　　尝试重起数据库，这个必须在晚上进行：

PMON started with pid=2 DBW0 started with pid=3 LGWR started with pid=4 CKPT started with pid=5 SMON started with pid=6 RECO started with pid=7 CJQ0 started with pid=8 QMN0 started with pid=9 ....

　　CJQ0正常启动，但是Job仍然不执行。

　　没办法了...

共2页: 上一页 1 [2] 下一页