Oracle Job Chain

標籤：job   program   chains   

Job Chains

建立chain的順序

1. 建立chain object；

2. 定義chain中的steps；

3. 增加規則；

4. 啟用chain；

5. 建立指向這個chain的job。

建立Chain Object

實驗描述：

ENV：create table test_chain(id number);

createtable test_chain1(id number);

createtable test_chain2(id number);

step1：test_chain1表插入一條資料；

step2：step1執行成功後，test_chain中有超過兩條資料時，插入test_chain2表一條資料。

begin

dbms_scheduler.create_chain(chain_name=>‘my_chain1‘,rule_set_name=>null,evaluation_interval=>interval ‘1‘ minute,

comments=>‘Chain with 30 minuteevaluation interval‘);

end;

/

PL/SQL procedure successfully completed.

evaluation_interval指的是chain rule的掃描間隔，這裡是自訂的。Scheduler在啟動job chain時和每次執行完chain step時都會去掃描chain rule，這裡除了啟動job chain時和chain step結束時，還會每一分鐘自動掃描一次來判斷rule的正確性。這個參數對於某種特殊情形，本次實驗就啟用這個參數。

定義Chain Steps建立program

begin

dbms_scheduler.create_program(program_name=>‘my_program1‘,program_type=>‘PLSQL_BLOCK‘,

program_action=>‘begin insert intotest_chain1 values (1);commit;end;‘);

end;

/

 

PL/SQL procedure successfully completed.

begin

dbms_scheduler.create_program(program_name=>‘my_program2‘,program_type=>‘PLSQL_BLOCK‘,

program_action=>‘begin insert intotest_chain2 values (2);commit;end;‘);

end;

/

 

PL/SQL procedure successfully completed.

--enable program

SQL> begin 

 2 dbms_scheduler.enable(‘my_program1,my_program2‘);

 3  end;

 4  /

建立step

begin

dbms_scheduler.define_chain_step(chain_name=>‘my_chain1‘,step_name=>‘my_step1‘,program_name=>‘my_program1‘);

dbms_scheduler.define_chain_step(chain_name=>‘my_chain1‘,step_name=>‘my_step2‘,program_name=>‘my_program2‘);

end;

/

 

PL/SQL procedure successfully completed.

Note：定義step時，program和chain可以不存在，但是啟動chain時，必須保證program

和chain存在。

增加Chain規則

Rule描述：

step1直接執行；

step2執行條件：step1執行成功，並且(selectcount(*) from test_chain) >=2

begin                               

dbms_scheduler.define_chain_rule(chain_name=>‘my_chain1‘,condition=>‘TRUE‘,action=>‘startmy_step1‘,rule_name=>‘rule_1‘);

end;

/

 

PL/SQL procedure successfully completed.

 

begin

dbms_scheduler.define_chain_rule(chain_name=>‘my_chain1‘,condition=>‘:my_step1.state=‘‘SUCCEEDED‘‘and (select count(*) from test_chain) >=2‘,

action=>‘startmy_step2‘,rule_name=>‘rule_1_2‘);

end;

/

 

PL/SQL procedure successfully completed.

啟用Chain

begin

dbms_scheduler.enable(‘my_chain1‘);

end;

/

 

PL/SQL procedure successfully completed.

建立Chain job

Note：直接調用run_chain運行則不需enablechain，建立job則需要。

begin

dbms_scheduler.create_job(job_name=>‘chain_job_1‘,job_type=>‘CHAIN‘,job_action=>‘my_chain1‘,

start_date=>sysdate,repeat_interval=>‘freq=minutely;interval=1‘,enabled=>TRUE);

end;

/

Note：單獨啟動job，注意參數USE_CURRENT_SESSION=>false

SQL> begin

 2 dbms_scheduler.run_job(job_name=>‘chain_job_1‘,USE_CURRENT_SESSION=>false);

 3  end;

 4  /

 

SQL> selectjob_name,job_subname,status,req_start_date,actual_start_date fromuser_scheduler_job_run_details where job_name=‘CHAIN_JOB_1‘;

 

JOB_NAME        JOB_SUBNAME          STATUS     REQ_START_DATE                                     ACTUAL_START_DATE

--------------- ------------------------------ ----------------------------------------------------------------------------------------------------

CHAIN_JOB_1                          STOPPED    16-JUN-16 03.44.03.000000 PM +08:00                16-JUN-16 03.44.03.588735 PM+08:00

CHAIN_JOB_1     MY_STEP1             FAILED     16-JUN-16 03.44.03.682508 PM +08:00                16-JUN-16 03.44.03.693946 PM+08:00

CHAIN_JOB_1     MY_STEP1             SUCCEEDED  16-JUN-16 04.17.43.335679 PM +08:00                16-JUN-16 04.17.43.436069 PM+08:00

發現my_step2還沒有運行

SQL> select * from test_chain1;

 

       ID

----------

        1

my_program1已寫入資料

製造my_step2啟動的條件

SQL> insert into test_chainvalues(9);

 

1 row created.

 

SQL> /

 

1 row created.

SQL> commit;

 

Commit complete.

SQL> selectjob_name,job_subname,status,req_start_date,actual_start_date fromuser_scheduler_job_run_details where job_name=‘CHAIN_JOB_1‘;

 

JOB_NAME        JOB_SUBNAME          STATUS     REQ_START_DATE                                     ACTUAL_START_DATE

--------------- ------------------------------ -------------------------------------------------- --------------------------------------------------

CHAIN_JOB_1                          STOPPED    16-JUN-16 03.44.03.000000 PM +08:00                16-JUN-16 03.44.03.588735 PM+08:00

CHAIN_JOB_1     MY_STEP2             SUCCEEDED  16-JUN-16 04.30.43.064558 PM +08:00                16-JUN-16 04.30.43.152496 PM+08:00

CHAIN_JOB_1     MY_STEP1             FAILED     16-JUN-16 03.44.03.682508 PM +08:00                16-JUN-16 03.44.03.693946 PM+08:00

CHAIN_JOB_1     MY_STEP1             SUCCEEDED  16-JUN-16 04.17.43.335679 PM +08:00                16-JUN-16 04.17.43.436069 PM+08:00

SQL> select * from test_chain2;

 

       ID

----------

        2

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Oracle Job Chain