Oracle物化视图调优

Question

我正在尝试在我的应用程序中调整物化视图.我开始执行:

 dbms_advisor.tune_mview()

过程,并将以下代码写入Oracle SQL Developer的SQL_Worksheet:

variable mvtask varchar2(100); 
variable mvddl varchar2(4000);

execute :mvtask := 'MV_FOO_BAR';
execute select query into :mvddl from user_mviews where view_name = 'MV_FOO_BAR';

execute dbms_advisor.tune_mview(:mvtask, :mvddl);

select * from user_tune_mview;

显然,已经创建了物化视图(refresh fast on commmit然而,其运行速度令人无法接受地慢).顾问报告以下错误:

Error report:
ORA-13600: error encountered in Advisor
QSM-03112: Invalid CREATE MATERIALIZED VIEW statement
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.PRVT_ACCESS_ADVISOR", line 202
ORA-06512: at "SYS.PRVT_TUNE_MVIEW", line 1026
ORA-06512: at "SYS.DBMS_ADVISOR", line 754
ORA-06512: at line 1
13600. 00000 -  "error encountered in Advisor\n%s"
*Cause:    An error occurred in the Advisor.
           This message will be followed by a second message giving
           more details about the nature of the error.
*Action:   See the Advisor documentation
           for an explanation of the second error message.

但是,没有更多的报道,没有第二个错误消息的痕迹.有谁知道这里的问题是什么？我已经更加惊讶,因为MV已经存在并在数据库中工作,尽管速度很慢.

在相关的说明中,有没有人知道如何在SQL Developer中输入多行字符串.当我尝试这样的事情:

execute :mvddl :='create materialized view MV_FOO_BAR
build immediate
refresh fast on commit
...
';

SQL Developer在第一行窒息.字符串连接在我脑海中浮现,但我有几个100到150行的MV,我讨厌为它们中的每一行手动完成.

Answer 1

(1)当错误13600的文本引用"第二错误消息"时,它表示堆栈中的下一个错误 - 在这种情况下为QSM-03112.

(2)我认为错误的原因是,对TUNE_MVIEW的调用中的第二个参数是CREATE MATERIALIZED VIEW语句的全文,但是您只传递查询文本.

(3)对于多行问题,如果你使用显式的PL/SQL匿名块而不是"执行",我希望它能工作,例如:

BEGIN
  :mvddl := 'create materialized view MV_FOO_BAR
             build immediate
             refresh fast on commit
             ...
            ';
END;
/