11g調度--chain的使用

官網說明：

CREATE_CHAIN Procedure

This procedure creates a new chain. The chain name can be optionally qualified with a schema name (for example,myschema.myname).

這個過程用於創建一個新的鏈！鏈名可以這麼寫：user_name.chain_name

A chain is always created as disabled and must be enabled with the ENABLE Procedure before it can be used.

鏈總是disabled的，需要用 dbms_scheduler.enble('chain_name')來enabled

DBMS_SCHEDULER.CREATE_CHAIN (
   chain_name              IN VARCHAR2,    只需要指定該參數就可創建chain
   rule_set_name           IN VARCHAR2 DEFAULT NULL,
   evaluation_interval     IN INTERVAL DAY TO SECOND DEFAULT NULL,
   comments                IN VARCHAR2 DEFAULT NULL);

Parameter	Description
chain_name	The name to assign to the new chain, which can optionally be qualified with a schema. This must be unique in the SQL namespace, therefore, there cannot already be a table or other object with this name and schema. 在同一schema下 不能有其他對象和chain名一樣
rule_set_name	In the normal case, no rule set should be passed in. The Scheduler automatically creates a rule set and associated empty evaluation context. You then useDEFINE_CHAIN_RULE to add rules and DROP_CHAIN_RULE to remove them. 默認情況下，調度程序創建一個空的規則集合。你可以用 DEFINE_CHAIN_RULE來定義 或者 用DROP_CHAIN_RULE 刪除規則集合 Advanced users can create a rule set that describes their chain dependencies and pass it in here. This allows greater flexibility in defining rules. For example, conditions can refer to external variables, and tables can be exposed through the evaluation context. If you pass in a rule set, you must ensure that it is in the format of a chain rule set. (For example, all steps must be listed as variables in the evaluation context). If no rule set is passed in, the rule set created is of the formSCHED_RULESET${N} and the evaluation context created is of the form SCHED_EVCTX${N} See Oracle Streams Concepts and Administration for information on rules and rule sets.
evaluation_interval	If this is NULL, reevaluation of the rules of a running chain are performed only when the job starts and when a step completes. A non-NULL value causes rule evaluations to also occur periodically at the specified interval. Because evaluation may be CPU-intensive, this should be conservatively set to the highest possible value or left atNULL if possible. evaluation_interval cannot be less than a minute or greater than a day.
comments	An optional comment describing the purpose of the chain

下面附上例子：

步驟1：創建chain 
--a chain is always created as disabled and must be enabled with theenable procedure before it can be used.
begin
dbms_scheduler.create_chain('procedure_chain');
     dbms_scheduler.enable('procedure_chain');
end;
/


步驟2：
以下是級聯刪除chain下的rule和step
exec dbms_scheduler.drop_chain('procedure_chain',true);


/*批量創建program的腳本。注意要有create job權限！*/
create or replace procedure create_my_program
as
  p_v_name varchar2(60);
begin
  --刪除program
     for v_pro in(
         select program_name from user_scheduler_programs order by program_name
         )loop
              dbms_scheduler.drop_program(v_pro.program_name);
         end loop;
  --創建program
     for v_name in(
         select object_name from user_procedures where object_name like 'insert%' order by object_name
         )loop
    p_v_name := substr(v_name.object_name,8)||'_pro';
      dbms_scheduler.create_program(
                                       program_name => p_v_name,
                                       program_type => 'stored_procedure',
                                       program_action => v_name.object_name,
                                       enabled => true
                                         );  
    end loop;
end;
/
--------------------------------------------


批量創建步驟step
create or replace procedure create_my_step
as
begin
--刪除step
     for v_pro in(
         select step_name from user_scheduler_chain_steps order by step_name
         )loop
              dbms_scheduler.drop_chain_step('procedure_chain',v_pro.step_name);
         end loop;
  --創建step
     for v_name in(
         select program_name from user_scheduler_programs order by program_name
         )loop
      dbms_scheduler.define_chain_step(
                             chain_name => 'procedure_chain',
                             step_name => v_name.program_name||'_s',
                             program_name => v_name.program_name
                                 );  
    end loop;
end;
/




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

創建chain的規則：rule


----第一步
begin
dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'true',
action => 'start campus_data_y_pro_s',
rule_name => 'campus_data_y_start_r'
);
----開始執行campus_data_y


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'campus_data_y_pro_s completed',
action => 'start campus_report_y_pro_s',
rule_name => 'campus_report_y_r'
);
----當campus_data_y執行完成，執行campus_report_y


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'campus_data_y_pro_s completed',
action => 'start campus_report_m_pro_s',
rule_name => 'campus_report_m_r'
);
----當campus_data_y執行完成，執行campus_report_m


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'campus_report_m_pro_s completed',
action => 'start area_data_m_pro_s',
rule_name => 'area_data_m_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'area_data_m_pro_s completed',
action => 'start area_data_y_pro_s',
rule_name => 'area_data_y_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'area_data_y_pro_s completed',
action => 'start area_report_m_pro_s',
rule_name => 'area_report_m_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'area_report_m_pro_s completed',
action => 'start area_report_y_pro_s',
rule_name => 'area_report_y_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'area_report_y_pro_s completed',
action => 'start city_data_m_pro_s',
rule_name => 'city_data_m_r'
);




dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'city_data_m_pro_s completed',
action => 'start city_data_y_pro_s',
rule_name => 'city_data_y_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'city_data_y_pro_s completed',
action => 'start city_report_m_pro_s',
rule_name => 'city_report_m_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'city_report_m_pro_s completed',
action => 'start city_report_y_pro_s',
rule_name => 'city_report_y_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'city_report_y_pro_s completed',
action => 'start province_data_m_pro_s',
rule_name => 'province_data_m_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'province_data_m_pro_s completed',
action => 'start province_data_y_pro_s',
rule_name => 'province_data_y_r'
);




dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'province_data_y_pro_s completed',
action => 'start province_report_m_pro_s',
rule_name => 'province_report_m_r'
);


dbms_scheduler.define_chain_rule(
chain_name => 'procedure_chain',
condition => 'province_report_m_pro_s completed',
action => 'start province_report_y_pro_s',
rule_name => 'province_report_y_r'
);


---------------------------------------------
dbms_scheduler.define_chain_rule (
chain_name => 'procedure_chain',
condition => 'province_report_y_pro_s completed',
action => 'end 0',
rule_name => 'end_r'
);
-----執行province_report_y完成 關閉！
end;
/


測試：
delete province_report_m where f_time > to_date('2013-02-01','yyyy-mm-dd hh24:mi:ss');
-----手動運行chain  exec dbms_scheduler.run_chain('procedure_chain','campus_report_m_pro_s');


創建job：每天晚上2點執行
begin
dbms_scheduler.create_job(
job_name => 'exec_procedure_in_up',
job_type => 'chain',
job_action => 'procedure_chain',
repeat_interval => 'freq=daily;byhour=2',
enabled => true
);
end;
/