18 - Oracle Scheduler調度

第十八課

18、Oracle Scheduler調度

 作業job
 程序program
 調度schedule
 鏈chain
 窗口window
 作業類
CJQ0進程:作業隊列協調器
Jnnn進程:運行作業
參數:job_queue_processes
創建作業:

18.1 調度schedule

–基於時間的調度

BEGIN
  sys.dbms_scheduler.create_job(job_name => '"OUZY"."JOB1"'
                               ,job_type => 'PLSQL_BLOCK'
                               ,job_action => 'insert into t2 values(sysdate);'
                               ,repeat_interval => 'FREQ=SECONDLY;INTERVAL=10'
                               ,start_date => systimestamp at TIME ZONE
                                              'Asia/Shanghai'
                               ,job_class => '"DEFAULT_JOB_CLASS"'
                               ,auto_drop => FALSE
                               ,enabled => TRUE);
END;

作業的命令類型:
程序、匿名PL/SQL塊、存儲過程、可執行文件、鏈

創建程序program:

–創建程序program1

BEGIN
  dbms_scheduler.create_program(program_name => '"OUZY"."PROGRAM1"'
                               ,program_action => 'insert into tbs(name,dt) values(''program1'',sysdate);'
                               ,program_type => 'PLSQL_BLOCK'
                               ,enabled => TRUE);

從作業中抽取作業內容，就可以在多個作業中調用，而不必重複定義。

創建調度:

BEGIN
  dbms_scheduler.create_schedule(repeat_interval => 'FREQ=SECONDLY;INTERVAL=10'
                                ,start_date => systimestamp at TIME ZONE
                                               'Asia/Shanghai'
                                ,schedule_name => '"OUZY"."SCHEDULE1"');
END;

創建一個job(使用程序和調度):

BEGIN
  dbms_scheduler.create_job(job_name => '"OUZY"."JOB2"'
                           ,program_name => '"OUZY"."PROGRAM1"'
                           ,schedule_name => '"OUZY"."SCHEDULE1"'
                           ,job_class => '"DEFAULT_JOB_CLASS"'
                           ,auto_drop => TRUE
                           ,enabled => TRUE);
END;

18.2 作業鏈

鏈是爲達到組合目標而鏈接在一起的一系列已命名的程序。
運行程序A 然後運行程序B，如果程序A 和程序B 成功完成，則只運行程序C，否則運行程序D。
要啓動一個鏈，必須創建一個作業。

–創建測試表
create table tbs(name varchar2(20),dt date);

–創建程序program1

BEGIN
  dbms_scheduler.create_program(program_name => '"OUZY"."PROGRAM1"'
                               ,program_action => 'insert into tbs(name,dt) values(''program1'',sysdate);'
                               ,program_type => 'PLSQL_BLOCK'
                               ,enabled => TRUE);
END;

–創建程序program2

BEGIN
  dbms_scheduler.create_program(program_name => '"OUZY"."PROGRAM2"'
                               ,program_action => 'insert into tbs(name,dt) values(''program2'',sysdate);'
                               ,program_type => 'PLSQL_BLOCK'
                               ,enabled => TRUE);
END;

–創建程序program3

BEGIN
  dbms_scheduler.create_program(program_name => '"OUZY"."PROGRAM3"'
                               ,program_action => 'insert into tbs(name,dt) values(''program3'',sysdate);'
                               ,program_type => 'PLSQL_BLOCK'
                               ,number_of_arguments => 0
                               ,comments => ''
                               ,enabled => TRUE);
END;

–創建作業鏈

BEGIN
  dbms_scheduler.create_chain(chain_name => '"OUZY"."CHAIN1"');
  dbms_scheduler.define_chain_step(chain_name => '"OUZY"."CHAIN1"'
                                  ,step_name => '"STEP1"'
                                  ,program_name => '"OUZY"."PROGRAM1"');
  dbms_scheduler.define_chain_step(chain_name => '"OUZY"."CHAIN1"'
                                  ,step_name => '"STEP2"'
                                  ,program_name => '"OUZY"."PROGRAM2"');
  dbms_scheduler.define_chain_step(chain_name => '"OUZY"."CHAIN1"'
                                  ,step_name => '"STEP3"'
                                  ,program_name => '"OUZY"."PROGRAM3"');
    dbms_scheduler.define_chain_rule(chain_name => '"OUZY"."CHAIN1"'
                                  ,condition => 'TRUE'
                                  ,rule_name => 'RULE001'
                                  ,action => 'start step1');
  dbms_scheduler.define_chain_rule(chain_name => '"OUZY"."CHAIN1"'
                                  ,condition => 'step1 succeeded'
                                  ,rule_name => 'RULE002'
                                  ,action => 'start step2');
  dbms_scheduler.define_chain_rule(chain_name => '"OUZY"."CHAIN1"'
                                  ,condition => 'step1 failed'
                                  ,rule_name => 'RULE003'
                                  ,action => 'start step3');
  dbms_scheduler.define_chain_rule(chain_name => '"OUZY"."CHAIN1"'
                                  ,condition => 'step2 completed'
                                  ,rule_name => 'RULE004'
                                  ,action => 'END');
  dbms_scheduler.define_chain_rule(chain_name => '"OUZY"."CHAIN1"'
                                  ,condition => 'step3 completed'
                                  ,rule_name => 'RULE005'
                                  ,action => 'END');
  dbms_scheduler.enable('"OUZY"."CHAIN1"');
END;

–創建job

BEGIN
  dbms_scheduler.create_job(job_name => '"OUZY"."JOB1"'
                           ,job_type => 'CHAIN'
                           ,job_action => '"OUZY"."CHAIN1"'
                           ,repeat_interval => 'FREQ=SECONDLY;INTERVAL=10'
                           ,start_date => systimestamp at TIME ZONE
                                          'Asia/Shanghai'
                           ,job_class => '"DEFAULT_JOB_CLASS"'
                           ,auto_drop => TRUE
                           ,enabled => TRUE);
END;

18.3 窗口

窗口和資源計劃相關聯，都到窗口時間，特定資源計劃被激活，可以控制job的資源使用。
儘量避免窗口重疊。

BEGIN
  dbms_scheduler.create_window(window_name => '"WINDOW_TEST"'
                              ,resource_plan => 'DEFAULT_PLAN'
                              ,start_date => systimestamp at TIME ZONE
                                             'Asia/Shanghai'
                              ,duration => numtodsinterval(240, 'minute')
                              ,repeat_interval => 'FREQ=DAILY;BYHOUR=2;BYMINUTE=30;BYSECOND=30'
                              ,end_date => NULL
                              ,window_priority => 'LOW'
                              ,comments => '');
END;

BEGIN
  dbms_scheduler.create_job(job_name => '"OUZY"."JOB1"'
                           ,program_name => '"OUZY"."PROGRAM1"'
                           ,schedule_name => '"SYS"."WINDOW_TEST"'
                           ,job_class => '"DEFAULT_JOB_CLASS"'
                           ,auto_drop => TRUE
                           ,enabled => FALSE);
  dbms_scheduler.set_attribute(NAME => '"OUZY"."JOB1"'
                              ,attribute => 'stop_on_window_close'
                              ,VALUE => FALSE);
  dbms_scheduler.enable('"OUZY"."JOB1"');
END;

–強制打開窗口

BEGIN
  dbms_scheduler.open_window(window_name => 'WINDOW_TEST'
                            ,duration => '0 1:00:00'
                            ,force => TRUE);
END;

資源計劃激活，作業運行。

–關閉窗口

BEGIN
  dbms_scheduler.close_window(window_name => 'WINDOW_TEST');
END;

作業類:
作業可以被指派一個類,類可以鏈接一個資源計劃。
默認作業類: DEFAULT_JOB_CLASS

select * from dba_scheduler_jobs;
select * from dba_scheduler_schedules;
select * from dba_scheduler_programs;
select * from dba_scheduler_running_jobs;
select * from dba_scheduler_job_log;
select * from dba_scheduler_job_run_details;