oracle11g - 存储来自物化视图的数据

物化视图没有触发器。然而，可更新物化视图确实有触发器，但它有一个问题，它必须基于单个表。

基于不止一张表

CREATE MATERIALIZED VIEW LOG ON EMP;

CREATE MATERIALIZED VIEW mv_test
   REFRESH FAST WITH PRIMARY KEY
   FOR UPDATE
AS
   SELECT *
     FROM emp em JOIN DEPT de ON EM.DEPTNO = DE.DEPTNO;

ORA-12013: 可更新的物化视图必须足够简单才能进行快速刷新

基于单表

CREATE MATERIALIZED VIEW mv_test
   REFRESH FAST WITH PRIMARY KEY
   FOR UPDATE
AS
   SELECT * FROM emp;

Materialized View created.

扳机

CREATE OR REPLACE TRIGGER test_tg
   BEFORE INSERT OR UPDATE OF ENAME, MGR
   ON MV_TEST
   REFERENCING NEW AS New OLD AS Old
   FOR EACH ROW
DECLARE
   tmpVar   NUMBER;
BEGIN
   tmpVar := 0;


   NULL;
    -- do as per the logic
EXCEPTION
   WHEN OTHERS
   THEN
      NULL;
      -- Consider logging the error and then re-raise
      RAISE;
END test_tg;

Trigger created.

如果要求拥有历史数据，为什么不考虑使用可以使用调度程序作业执行的存储过程来实现标准事务表的数据持久性。

正如您所引用的查询具有 1 亿条记录的大表一样，我的估计是使用FOLL ALL或BULK COLLECT考虑批处理，不用说；这是一个不同的话题。

以下是过程和调度程序作业的伪代码，根据需要进行更改。使用 INSERT 或 MERGE

使用 INSERT 的过程

CREATE OR REPLACE PROCEDURE historical_records (p_emp_no emp.empno%TYPE)
IS
BEGIN
   FOR rec IN (  SELECT ename, mgr, SUM (sal) tot_sal
                   FROM scott.emp
                  WHERE empno = p_emp_no
               GROUP BY ename, mgr)
   LOOP
      INSERT INTO hist_table (empno,
                              ename,
                              mgr,
                              sal_tot)
           VALUES (rec.empno,
                   rec.ename,
                   rec.mgr,
                   rec.tot_sal);
   END LOOP;
END;

使用 MERGE 的过程

CREATE OR REPLACE PROCEDURE historical_records (p_emp_no emp.empno%TYPE)
IS
BEGIN
   MERGE INTO hist_table trg
        USING (  SELECT ename, mgr, SUM (sal) tot_sal
                   FROM scott.emp
                  WHERE empno = p_emp_no
               GROUP BY ename, mgr) src
           ON (trg.empno = src.empno)
   WHEN MATCHED
   THEN
      UPDATE SET trg.ename = src.ename, trg.mgr = src.mgr
   WHEN NOT MATCHED
   THEN
      INSERT     (trg.empno, trg.ename, trg.sal_tot)
          VALUES (src.empno, src.ename, src.tot_sal);
END;

调度程序作业

BEGIN
   DBMS_SCHEDULER.CREATE_JOB (
      job_name          => 'HIST_PROC_JOB',
      job_type          => 'PLSQL_BLOCK',
      JOB_ACTION        => 'BEGIN historical_records; END;',
      start_date        => SYSDATE,
      repeat_interval   => 'FREQ=DAILY;BYHOUR=23;BYMINUTE=05',
      end_date          => NULL,
      enabled           => TRUE,
      comments          => 'Historical data insertion');
END;
/

oracle11g - 存储来自物化视图的数据

问题描述

解决方案

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