环境:
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OS:Centos 7.5
DB:Oracle 11.2.0.4.0单实例
场景一:job没开始,停库, 再次起库后,起库时间为job开始时间,开始自动运行job,不会自动补停库期间错过的job. 场景二:job运行一半,停库,再次起库后,起库时间为job开始运行时间,不会接着停库前执行一半的job继续执行,job重新开始执行。 场景三:停库前,将job_queue_processes参数设置为0,正在运行的job会继续运行完成,后续的job将不会自动运行。再将job_queue_processes参数改回1000,job将开始运行。
job_queue_processes取值范围为0到1000
当设定该值为0的时候则任意方式创建的job都不会运行。
当设定该值大于1时,且并行执行job时,至少一个为协调进程。其总数不会超出job_queue_processes的值。
实验过程如下:
创建测试数据
---sys SQL> grant execute on DBMS_LOCK to cjc; ---cjc SQL> create table t1(id number,itime varchar2(200));
SQL> CREATE OR REPLACE PROCEDURE test_pro is begin for i in 1 .. 10 loop insert into t1 values (i, to_char(sysdate, 'yyyy/mm/dd hh34:mi:ss')); DBMS_LOCK.SLEEP(10); commit; end loop; end; /
SQL> exec test_pro; PL/SQL procedure successfully completed. Elapsed: 00:01:40.09
创建job
SQL> declare job_id pls_integer; begin sys.dbms_job.submit(job => job_id, what => 'test_pro;', next_date => to_date('2020-07-02 22:25:00', 'yyyy-mm-dd hh34:mi:ss'), interval => 'TRUNC(sysdate,''mi'') + 3 / (24 * 60)'); commit; end; /
场景一:job没开始,停库
select job, schema_user, last_date, this_date, next_date, interval from dba_jobs where schema_user = 'CJC';
JOBSCHEMA_USERLAST_DATETHIS_DATENEXT_DATEINTERVAL 123CJC2020/7/2 22:52:142020/7/2 22:55:00TRUNC(sysdate,'mi') + 3 / (24 * 60)
22:54 SQL> shutdown immediate
22:56 SQL> startup select * from dba_jobs_running; SIDJOBFAILURESLAST_DATELAST_SECTHIS_DATETHIS_SECINSTANCE 1292302020/7/2 22:52:1422:52:142020/7/2 22:56:2422:56:240
SQL> select job, schema_user, last_date, this_date, next_date, interval from dba_jobs where schema_user = 'CJC'; JOBSCHEMA_USERLAST_DATETHIS_DATE NEXT_DATE INTERVAL 123CJC2020/7/2 22:52:142020/7/2 22:56:242020/7/2 22:55:00TRUNC(sysdate,'mi') + 3 / (24 * 60)
SQL> select count(*) from t1; COUNT(*) ---------- 10
场景二:job执行一半,停库
select job, schema_user, last_date, this_date, next_date, interval from dba_jobs where schema_user = 'CJC'; JOBSCHEMA_USERLAST_DATETHIS_DATENEXT_DATEINTERVAL 123CJC2020/7/2 22:56:242020/7/2 22:59:00TRUNC(sysdate,'mi') + 3 / (24 * 60)
select * from dba_jobs_running SIDJOBFAILURESLAST_DATELAST_SECTHIS_DATETHIS_SECINSTANCE 1292302020/7/2 22:56:2422:56:242020/7/2 22:59:0022:59:000
SQL> select count(*) from t1; COUNT(*) ---------- 12
22:59 SQL> shutdown immediate
23:00 SQL> startup
select * from dba_jobs_running SIDJOBFAILURESLAST_DATELAST_SECTHIS_DATETHIS_SECINSTANCE 1302302020/7/2 22:56:2422:56:242020/7/2 23:00:3323:00:330
select job, schema_user, last_date, this_date, next_date, interval from dba_jobs where schema_user = 'CJC'; JOBSCHEMA_USERLAST_DATETHIS_DATENEXT_DATEINTERVAL 123CJC2020/7/2 22:56:242020/7/2 23:00:332020/7/2 22:59:00TRUNC(sysdate,'mi') + 3 / (24 * 60)
SQL> select count(*) from t1; COUNT(*) ---------- 24
场景三:调节job_queue_processes参数
SQL> show parameter job_queue_processes SQL> select * from dba_jobs_running; SQL> alter system set job_queue_processes=0; SQL> select * from dba_jobs_running; SQL> alter system set job_queue_processes=1000; SQL> select * from dba_jobs_running; SQL> select count(*) from t1;
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