kettle资源库备份

存储过程：

在本地使用dblink连接远程表创建物化视图，根据物化视图创建表

create or replace procedure backup_kettle
AUTHID CURRENT_USER
 as
  cursor tbl_cur is
     select table_name as src_table    from all_tables@db_kettle
     where 1 = 1 and owner = 'KETTLE' ;
  v_src_table varchar2(64);
  v_mat_name varchar2(64);
  v_cnt_sql varchar2(1000);
  v_status varchar2(20);
  v_counts int;
begin
  
  select status into v_status from v$instance@db_kettle;
  select count(1) into v_counts from R_JOB;
  if v_status='OPEN' and v_counts >1 then
 for row in (select mview_name from all_mviews where owner ='KETTLE' and mview_name like 'SYNC%')
      loop
        execute immediate 'drop MATERIALIZED view  '||row.mview_name;
        end loop;
 for row in (select table_name from all_tables where owner ='KETTLE' and( table_name like 'R%' or table_name like 'EDW%'))
      loop
        execute immediate 'drop table  '||row.table_name;
        end loop;
        
  open tbl_cur; -- 打开游标
  loop
    fetch tbl_cur into v_src_table; -- 取值
    exit when tbl_cur%notfound; --当没有记录时退出循环

   v_mat_name:='SYNC_'||v_src_table;

    v_cnt_sql:='create  MATERIALIZED view  '||v_mat_name||'  BUILD IMMEDIATE    DISABLE QUERY REWRITE as
select * from '||v_src_table||'@db_kettle';
  
    execute immediate v_cnt_sql;
    
   DBMS_MVIEW.REFRESH('"'||v_mat_name||'"','C');
   

    v_cnt_sql:= 'create table  '||v_src_table||' as  select * from '||v_mat_name;
    execute immediate v_cnt_sql ;
    commit;
  end loop;

  close tbl_cur; -- 关闭游标
end if;
end;

创建job定时执行该存储过程

declare
  job number;
BEGIN
  DBMS_JOB.SUBMIT(  
        JOB => job,  /*自动生成JOB_ID*/  
        WHAT => 'backup_kettle;',  /*需要执行的存储过程名称或SQL语句*/  
        NEXT_DATE => sysdate,  /*初次执行时间-立即执行*/  
        INTERVAL => 'trunc(sysdate+1)+22*60/24*60+15/60' /*每隔1分钟执行一次*/
      );  
  commit;
end;

ps:

select value from v$parameter where name like '%job_queue_processes%' 
如果value的值是0 ，则定时任务不会执行，需改一下
alter system set job_queue_processes = 30 scope=MEMORY


scope说明：spfile、memory、both
spfile指重启数据库生效
memory指在内存中生效即立即生效，但重启后会失效
both指立即生效且永久有效

对于pfile启动的数据库 scope默认是MEMORY，如果指定memory和spfile会发生错误
对于spfile启动的数据库 scope默认是BOTH