使用以下SQL,可以获取给定物化视图的DDL。
BEGIN
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM, 'STORAGE', FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM, 'TABLESPACE', FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM, 'SEGMENT_ATTRIBUTES', FALSE);
END;
SELECT DBMS_METADATA.GET_DDL('MATERIALIZED_VIEW', 'OBJECT_NAME', 'SCHEMA_NAME') FROM DUAL;
我在没有表空间信息的情况下检索DDL有困难。 SET_TRANSFORM_PARAM
指令实际上记录为特定于表和索引(不是物化视图)。 STORAGE
实际上有效,而TABLESPACE
和SEGMENT_ATTRIBUTES
则无效。有没有办法从生成的DDL中省略表空间信息?
答案 0 :(得分:6)
您需要将对SET_TRANSFORM_PARAM的调用中的object_type设置为MATERIALIZED_VIEW。在下面的示例中,没有提到表空间:
create materialized view mv
as select * from large_t where rownum < 100;
begin DBMS_METADATA.SET_TRANSFORM_PARAM (
transform_handle => dbms_metadata.session_transform,
name => 'TABLESPACE',
value => false,
object_type => 'MATERIALIZED_VIEW');
end;
/
select dbms_metadata.get_ddl(
'MATERIALIZED_VIEW',
'MV',
user)
from dual;
CREATE MATERIALIZED VIEW "SODONNEL"."MV" ("OWNER", "OBJECT_NAME", "SUBOBJECT_NAME", "OBJECT_ID", "DATA_OBJECT_ID", "OBJECT_TYPE", "CREATED", "LAST_DDL_TIME", "TIMESTAMP", "STATUS", "TEMPORARY", "GENERATED", "SECONDARY", "NAMESPACE", "EDITION_NAME")
ORGANIZATION HEAP PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
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)
BUILD IMMEDIATE
USING INDEX
REFRESH FORCE ON DEMAND
USING DEFAULT LOCAL ROLLBACK SEGMENT
USING ENFORCED CONSTRAINTS DISABLE QUERY REWRITE
AS select * from large_t where rownum < 100