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()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。

   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;