怎样让一个表的数据与一个视图的数据保持同步

Question

我有一个视图，与多个表相关连，并使用了union，在查询这个视图的时候非常慢。我想用一个临时表与这个视图保持数据同步，提高查询效率，有什么可行的方案吗。谢谢。

Answer 1

SQL> create view v_test as select * from test;视图被创建SQL> edSQL> create materialized view mv_test refresh complete  as select * from v_test;物化视图被创建SQL> select * from test;        ID NAME                                               CODE                                                       RN        RN1
---------- -------------------------------------------------- -------------------------------------------------- ---------- ----------
         1 aaa                                                nPPP1                                                       1 
         1 aaa                                                nPPP2                                                       2          1
         2 bbb                                                nQQQ1                                                       1 SQL> insert into test values(3,'test','test',3,3);1 行 已插入SQL> commit;提交完成SQL> select * from test;        ID NAME                                               CODE                                                       RN        RN1
---------- -------------------------------------------------- -------------------------------------------------- ---------- ----------
         1 aaa                                                nPPP1                                                       1 
         1 aaa                                                nPPP2                                                       2          1
         2 bbb                                                nQQQ1                                                       1 
         3 test                                               test                                                        3          3SQL> select * from mv_test;        ID NAME                                               CODE                                                       RN        RN1
---------- -------------------------------------------------- -------------------------------------------------- ---------- ----------
         1 aaa                                                nPPP1                                                       1 
         1 aaa                                                nPPP2                                                       2          1
         2 bbb                                                nQQQ1                                                       1 SQL> select * from v_test;        ID NAME                                               CODE                                                       RN        RN1
---------- -------------------------------------------------- -------------------------------------------------- ---------- ----------
         1 aaa                                                nPPP1                                                       1 
         1 aaa                                                nPPP2                                                       2          1
         2 bbb                                                nQQQ1                                                       1 
         3 test                                               test                                                        3          3SQL> exec dbms_mview.refresh('mv_test','c');PL/SQL 过程成功完成SQL> select * from mv_test;        ID NAME                                               CODE                                                       RN        RN1
---------- -------------------------------------------------- -------------------------------------------------- ---------- ----------
         1 aaa                                                nPPP1                                                       1 
         1 aaa                                                nPPP2                                                       2          1
         2 bbb                                                nQQQ1                                                       1 
         3 test                                               test                                                        3          3

Answer 2

楼主，你表里数据更新速度快不，如果不是很快，建议楼主采用cenlmmx(学海无涯苦作舟) 的方法。创建物化视图的时候可以考虑用start with sysdate next sysdate+2选项，要数据库自己来刷新数据，其中sysdate+2是下次刷新的时间，楼主可以根据实际情况设定。

Answer 3

selecthis(小懒蛋)指的效率问题是什么，我如果10分钟刷新一次数据，可以吗，如果我有10万条记录，刷新一次要多长时间？

Answer 4

create materialized view mv_test 
refresh complete  
start with sysdate next sysdate+2
as select * from v_test;

Answer 5

可以作到每10分钟刷新一次
start with sysdate next sysdate+10/24*60影响刷新的时间有很多因素，比如硬件的配置，
访问的是本地表还是远程表，等等。

Answer 6

刚才试了一下，我原来的视图里面有子查询，我执行的时候告诉我不能有子查询。create materialized view mpubresume
refresh complete
start with sysdate next sysdate+2
 as
select * from baseuser

Answer 7

如果是本地表，10w条数据应该不要好长时间，
建议楼主先用cenlmmx(学海无涯苦作舟) 的方法测试下还可以用增量刷新的方式，但需要在源表上建立日志表

Answer 8

zhzhl0(太极)能看看我发给你的消息吗。