我需要将相当数量的物化视图更改为Oracle 11g上的常见视图。 我的第一种方法:ORACLE - 从物化视图创建视图
1)获取的DDL
select dbms_metadata.get_ddl(replace(object_type, ' ', '_'), object_name, owner)
from all_objects
where owner = 'MY_SCHEMA'
and object_type = 'MATERIALIZED VIEW'
and object_name in (
'MAT_VIEW1'
,'MAT_VIEW2'
,'MAT_VIEW3'
,'MAT_VIEW4'
-- ..
,'MAT_VIEW100'
);
每一行包含的DDL相应MVIEW,FE:
CREATE MATERIALIZED VIEW "MY_SCHEMA"."MVIEW1" ("ROW1", "ROW2", "ROW3")
ORGANIZATION HEAP PCTFREE 0 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS NOLOGGING
STORAGE(INITIAL 163840 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "MY_TABSPACE"
BUILD IMMEDIATE
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "MY_TABLESPACE"
REFRESH FORCE ON DEMAND
WITH PRIMARY KEY USING DEFAULT LOCAL ROLLBACK SEGMENT
USING ENFORCED CONSTRAINTS DISABLE QUERY REWRITE
AS SELECT ROWA AS ROW1,
ROWB AS ROW2,
ROWC AS ROW3
FROM MY_SCHEMA.TABLE1
2)摆脱额外的技术的通过使用正则表达式进行配置。为了方便起见,我使用RegexBuddy并复制粘贴文本。 Oracle不支持看进/快退功能,如FAS,因为我注意到:
(?=ORGANIZATION\sHEAP).+?(QUERY\sREWRITE)
结果:
CREATE MATERIALIZED VIEW "MY_SCHEMA"."MVIEW1" ("ROW1", "ROW2", "ROW3")
AS SELECT ROWA AS ROW1,
ROWB AS ROW2,
ROWC AS ROW3
FROM MY_SCHEMA.TABLE1
最后我删除“实现”从每个DDL,现在我有有效的DDL为意见。
同时,我有一个想法spontanious,只是试图
create view usual_view1 as
select * from mat_view1;
嗯,那工作为好,用相当少的努力。
所以我的问题:在创建视图时,是否有任何区别,通过与通常的DDL创建方式比较,从物化的视图的定义创建视图?
“你的观点是显示你在物化视图中保存的数据。“因为它是:CREATE VIEW”MY_SCHEMA“。”MVIEW1“(”ROW1“,”ROW2“,”ROW3“)AS SELECT ROWA AS ROW1,ROWB AS ROW2,ROWC AS ROW3 FROM MY_SCHEMA.TABLE1 它引用而不是MVIEW?! – royskatt
@royskatt - 我指的是您的'较少努力'方法;更新以使其更清晰。是的,第一种方法是针对底层数据;但第二种方法是针对(过时的)mview –
知道了!非常感谢您的澄清! – royskatt