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  • [bbk5163]第56集第6章 用scheduler自动化 04

    Persistent Lightweight Jobs

    Persistent lightweight jobs:

    • Reduce the overhead and time required to start a job
    • Have a small footprint on disk for the job metadata and for storing run-time data.
    • Are created from a job template(in the commad line)

    创建lightweight job的语法

    BEGIN
            DBMS_SCHEDULER.CREATE_JOB(
                    job_name        => 'lightweight_jobs',
                    program_name    => 'prog1',
                    schedule_name   => 'schedule1',
                    job_style       => 'LIGHTWEIGHT'
            );
    END;
    /

    Choosing the right job:

    • Use regular jobs for maximum flexibility
    • Use persistent lightweight jobs when you need to create a large number of jobs in a very short time.

    如何创建一个轻量级的Job,具体操作请参阅如下步骤:

    create table log_lw(
      user_name varchar2(10),
      user_date date
    );
    
    create or replace procedure proc_lw
    is
    begin
     insert into log_lw(user_name,user_date) values(user,sysdate);
     commit;
    end;
    /
    
    
    /*
            =======================================================================================================
            program
            =======================================================================================================
    */
    
    ------------------------------create
    
    BEGIN
            DBMS_SCHEDULER.CREATE_PROGRAM(
                    program_name => 'prog_lw',
                    program_action => 'U2.proc_lw',
                    program_type => 'STORED_PROCEDURE',
                    enabled => TRUE
            );
    END;
    /
    
    ------------------------------drop
    
    BEGIN
            DBMS_SCHEDULER.DROP_PROGRAM(
                    program_name => 'prog_lw'
            );
    END;
    /
    /*
            =======================================================================================================
            Schedule
            =======================================================================================================
    */
    
    ------------------------------create
    BEGIN
            DBMS_SCHEDULER.CREATE_SCHEDULE(
                    schedule_name => 'schedule_lw',
                    start_date => SYSTIMESTAMP,
                    end_date => SYSTIMESTAMP + 1,
                    repeat_interval => 'FREQ=MINUTELY;INTERVAL=1',
                    comments => 'Every MINUTELY'
            );
    END;
    /
    ------------------------------drop
    BEGIN
            DBMS_SCHEDULER.DROP_SCHEDULE(
                    schedule_name => 'schedule_lw'
            );
    END;
    /
    /*
            =======================================================================================================
            lightweight job
            =======================================================================================================
    */
    ------------------------------create
    BEGIN
            DBMS_SCHEDULER.CREATE_JOB(
                    job_name        => 'lightweight_job',
                    program_name    => 'prog_lw',
                    schedule_name   => 'schedule_lw',
                    job_style       => 'LIGHTWEIGHT'
            );
    END;
    /
    ------------------------------drop
    BEGIN
            DBMS_SCHEDULER.DROP_JOB(
                    job_name        => 'lightweight_job'
            );
    END;
    /
    
    begin
      dbms_scheduler.enable('lightweight_job');
    end;
    /
    
    select job_name,enabled from user_scheduler_jobs;
    
    select * from log_lw;
    
    
    
    /
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  • 原文地址:https://www.cnblogs.com/arcer/p/3105470.html
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