20200705-Oracle 11g 测试停库对job的影响

环境：

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 hh24: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 hh24: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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