ORACLEJOB不能按预期执行的常见原因Oracle认证考试

文章作者 100test 发表时间 2009:08:07 17:16:53
来源 100Test.Com百考试题网

"mkhgigh"> 　　最近在一个测试环境中建立物化视图远程同步环境，但是远程视图一直未按照预期的时间进行刷新。以至于一开始让我怀疑ONDEMAND与STARTWITHNEXTBY冲突。但再三确认，发现是我的测试环境中ora_cjq0进程不存在，唉!开始怎么不往这方面去想呢，修改一下JOB_QUEUE_PROCESSES参数，一切恢复正常,突然发现ORACLE JOB方面的问题还不少，贴一篇METALINK文章，历数以前碰到的JOB失效的原因，无非以下几种：
　　JobsNotExecuting Automatically文档ID:注释:313102.1
　　Symptoms
　　Jobs arenolonger executing automatically.
　　Ifforced(execdbms_job.run().),theseexecutefine.
　　Cause
　　Tryingthemost common reasons why jobs dont execute automatically and as scheduled:
　　1) Instance in RESTRICTED SESSIONS mode?
　　Check if the instance is in restricted sessions mode:
　　0select instance_name,logins from v$instance.
　　If logins=RESTRICTED, then:
　　alter system disable restricted session.
　　^-- Checked!
　　2) JOB_QUEUE_PROCESSES=0
　　Make sure that job_queue_processes is >. 0
　　show parameter job_queue_processes
　　^-- Checked!
　　3) _SYSTEM_TRIG_ENABLED=FALSE
　　Check if _system_enabled_trigger=false
　　col parameter format a25
　　col value format a15
　　0select a.ksppinm parameter,b.ksppstvl value from x$ksppi a,x$ksppcv b
　　Where a.indx=b.indx and ksppinm=’_system_trig_enabled’.
　　^-- Checked!
　　4) Is the job BROKEN?
　　0select job,broken from dba_jobs where job=.
　　If broken, then check the alert log and trace files to diagnose the issue.
　　^-- Checked! The job is not broken.
　　5) Is the job COMMITted?
　　Make sure a commit is issued after submitting the job:
　　DECLARE X NUMBER.
　　BEGIN
　　SYS.DBMS_JOB.SUBMIT
　　(
　　job =>. X
　　,what =>. dbms_utility.analyze_schema
　　(SCOTT,COMPUTE,NULL,NULL,NULL).
　　,next_date =>. to_date(08/06/200509:35:00,dd/mm/yyyy hh24:mi:ss)
　　,no_parse =>. FALSE
　　).
　　COMMIT.
　　END.
　　/
　　If the job executes fine if forced (i.e., exec dbms_jobs.run().), then likely a commit
　　is missing.
　　^-- Checked! The job is committed after submission.
　　6) UPTIME >. 497 days
　　Check if the server (machine) has been up for more than 497 days:
　　For SUN , use uptime OS command.
　　If uptime>.497 and the jobs do not execute automatically, then you are hitting bug 3427424
　　(Jobs may stop running after 497 days uptime) which is fixed in 9206 and A102
　　^-- Checked! The server in this case has been up 126 days only
　　7) DBA_JOBS_RUNNING
　　Check dba_jobs_running to see if the job is still running:
　　0select * from dba_jobs_running.
　　^-- Checked! The job is not running.
　　8) LAST_DATE and NEXT_DATE
　　Check if the last_date and next_date for the job are proper:
　　0select Job,Next_date,Last_date from dba_jobs where job=.
　　^-- NEXT_DATE is porper, however LAST_DATE is null since the job never executes automatically.
　　9) NEXT_DATE and INTERVAL
　　Check if the Next_date is changing properly as per the interval set in dba_jobs:
　　0select Job,Interval,Next_date,Last_date from dba_jobs where job=.
　　^-- This is not possible since the job never gets executed automatically.
　　10) Toggle value for JOB_QUEUE_PROCESSES

　　编辑特别推荐:

　　指点一下：到底该不该去考JAVA认证?

　　Java认证权威问答精华集
　　Set job_queue_processes=0, wait some time and then and set it back to the original value:
　　alter system set job_queue_processes=0 .
　　--
　　alter system set job_queue_processes=4 .
　　Ref: Bug 2649244 (fixed by: 9015,9203,A000)
　　^-- Done but did not help
　　11) DBMS_IJOB(Non-documented):
　　Last ditch effort.
　　Either restart the database or try the following:
　　exec dbms_ijob.set_enabled(true).
　　Ref: Bug 3505718 (Closed, Not a Bug)
　　@Note 90989.1 (Using DBMS_IJOB) INTERNAL NOTE
　　Done but did not help
　　These are the most common causes for this behavior.
　　Solution
　　The solution ended up to be the server (machine) uptime.
　　Even though it was up for only 126 days, after the server was rebooted all jobs were able to execute automatically.
　　To implement the solution, please execute the following steps:
　　1. Shutdown all applications, including databases.
　　2. Shutdown the server (machine)
　　3. Restart all applications, including databases.
　　4. Check that jobs are executing automatically.