DBMS_METADATA中使用SESSION_TRANSFORM過濾不想擷取的DDL，dbmsmetadata

DBMS_METADATA中使用SESSION_TRANSFORM過濾不想擷取的DDL，dbmsmetadata

我們一般使用dbms_metadata.get_ddl擷取對象的ddl的時候，有時會擷取一些其他額外的資訊，例如當你想擷取表的建立語句的時候，你會得到表的約束資訊，這個資訊可能是你不想要的，那麼就可以用SESSION_TRANSFORM對它進行過濾。

看下面的樣本，建立一個有主鍵和外鍵的表，擷取他的ddl語句：

SQL> CREATE TABLE tb1 (id int primary key);Table created.SQL> create table tb2 (id int primary key references tb1(id));Table created.SQL> insert into tb1 values(1);1 row created.SQL> commit;Commit complete.SQL> insert into tb2 values(1);1 row created.SQL> commit;SQL>  select dbms_metadata.get_ddl('TABLE','TB2','TEST') from dual;DBMS_METADATA.GET_DDL('TABLE','TB2','TEST')--------------------------------------------------------------------------------  CREATE TABLE "TEST"."TB2"   ("ID" NUMBER(*,0), PRIMARY KEY ("ID")  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 "USERS"  ENABLE, FOREIGN KEY ("ID")  REFERENCES "TEST"."TB1" ("ID") ENABLE   ) SEGMENT CREATION IMMEDIATE  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)  TABLESPACE "USERS"  

不單單是擷取到了建立的基本欄位的語句，還有主鍵，約束，外鍵，儲存參數，資料表空間等，如果這些你不需要，都是可以進行過濾的，例如我過濾掉主鍵、外鍵、儲存資訊

使用如下語句：

exec DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'REF_CONSTRAINTS',false);
exec DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'CONSTRAINTS',false);
exec DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'STORAGE',false);

  exec DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'REF_CONSTRAINTS',false);PL/SQL procedure successfully completed.exec DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'CONSTRAINTS',false);PL/SQL procedure successfully completed.SQL> exec DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'STORAGE',false);PL/SQL procedure successfully completed.SQL> SQL>  select dbms_metadata.get_ddl('TABLE','TB2','TEST') from dual;DBMS_METADATA.GET_DDL('TABLE','TB2','TEST')--------------------------------------------------------------------------------  CREATE TABLE "TEST"."TB2"   ("ID" NUMBER(*,0)   ) SEGMENT CREATION IMMEDIATE  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING  TABLESPACE "USERS" 

還可以對其他的一些資訊做過濾，表格如下：

Table 87-22 SET_TRANSFORM_PARAM: Transform Parameters for the DDLTransform

Object Type	Name	Datatype	Meaning
All objects	PRETTY	BOOLEAN	If TRUE, format the output with indentation and line feeds. Defaults toTRUE.
All objects	SQLTERMINATOR	BOOLEAN	If TRUE, append a SQL terminator (; or /) to each DDL statement. Defaults to FALSE.
TABLE	SEGMENT_ATTRIBUTES	BOOLEAN	If TRUE, include segment attributes clauses in the DDL. If FALSE, omit them. Defaults to TRUE.
TABLE	STORAGE	BOOLEAN	If TRUE, include storage clauses in the DDL. If FALSE, omit them. Defaults to TRUE. (Ignored if SEGMENT_ATTRIBUTES is FALSE.)
TABLE	TABLESPACE	BOOLEAN	If TRUE, include tablespace clauses in the DDL. If FALSE, omit them. (Ignored if SEGMENT_ATTRIBUTES is FALSE.) Defaults to TRUE.
TABLE	CONSTRAINTS	BOOLEAN	If TRUE, include all non-referential table constraints in the DDL. If FALSE, omit them. Defaults to TRUE.
TABLE	REF_CONSTRAINTS	BOOLEAN	If TRUE, include all referential constraints (foreign keys) in the DDL. IfFALSE, omit them. Defaults to TRUE.
TABLE	CONSTRAINTS_AS_ALTER	BOOLEAN	If TRUE, include table constraints as separate ALTER TABLE (and, if necessary, CREATE INDEX) statements. If FALSE, specify table constraints as part of the CREATE TABLE statement. Defaults to FALSE. Requires thatCONSTRAINTS be TRUE.
TABLE	OID	BOOLEAN	If TRUE, include the OID clause for object tables in the DDL. If FALSE, omit it. Defaults to FALSE.
TABLE	SIZE_BYTE_KEYWORD	BOOLEAN	If TRUE, include the BYTE keyword as part of the size specification ofCHAR and VARCHAR2 columns that use byte semantics. If FALSE, omit the keyword. Defaults to FALSE.
TABLE, INDEX	PARTITIONING	BOOLEAN	If TRUE, include partitioning clauses in the DDL. If FALSE, omit them. Defaults to TRUE.
INDEX, CONSTRAINT,ROLLBACK_SEGMENT,CLUSTER, TABLESPACE	SEGMENT_ATTRIBUTES	BOOLEAN	If TRUE, include segment attributes clauses (physical attributes, storage attributes, tablespace, logging) in the DDL. If FALSE, omit them. Defaults to TRUE.
INDEX, CONSTRAINT,ROLLBACK_SEGMENT, CLUSTER	STORAGE	BOOLEAN	If TRUE, include storage clauses in the DDL. If FALSE, omit them. (Ignored if SEGMENT_ATTRIBUTES is FALSE.) Defaults to TRUE.
INDEX, CONSTRAINT,ROLLBACK_SEGMENT, CLUSTER	TABLESPACE	BOOLEAN	If TRUE, include tablespace clauses in the DDL. If FALSE, omit them. (Ignored if SEGMENT_ATTRIBUTES is FALSE.) Defaults to TRUE.
TYPE	SPECIFICATION	BOOLEAN	If TRUE, include the type specification in the DDL. If FALSE, omit it. Defaults to TRUE.
TYPE	BODY	BOOLEAN	If TRUE, include the type body in the DDL. If FALSE, omit it. Defaults toTRUE.
TYPE	OID	BOOLEAN	If TRUE, include the OID clause in the DDL. If FALSE, omit it. Defaults toFALSE.
PACKAGE	SPECIFICATION	BOOLEAN	If TRUE, include the package specification in the DDL. If FALSE, omit it. Defaults to TRUE.
PACKAGE	BODY	BOOLEAN	If TRUE, include the package body in the DDL. If FALSE, omit it. Defaults to TRUE.
VIEW	FORCE	BOOLEAN	If TRUE, use the FORCE keyword in the CREATE VIEW statement. If FALSE, do not use the FORCE keyword in the CREATE VIEW statement. Defaults toTRUE.
OUTLINE	INSERT	BOOLEAN	If TRUE, include the INSERT statements into the OL$ dictionary tables that will create the outline and its hints. If FALSE, omit a CREATE OUTLINEstatement. Defaults to FALSE. Note: This object type is being deprecated.
All objects	DEFAULT	BOOLEAN	Calling SET_TRANSFORM_PARAM with this parameter set to TRUE has the effect of resetting all parameters for the transform to their default values. Setting this FALSE has no effect. There is no default.
All objects	INHERIT	BOOLEAN	If TRUE, inherits session-level parameters. Defaults to FALSE. If an application calls ADD_TRANSFORM to add the DDL transform, then by default the only transform parameters that apply are those explicitly set for that transform handle. This has no effect if the transform handle is the session transform handle.
ROLE	REVOKE_FROM	Text	The name of a user from whom the role must be revoked. If this is a non-null string and if the CREATE ROLE statement grants you the role, aREVOKE statement is included in the DDL after the CREATE ROLEstatement. Note: When you issue a CREATE ROLE statement, Oracle may grant you the role. You can use this transform parameter to undo the grant. Defaults to null string.
TABLESPACE	REUSE	BOOLEAN	If TRUE, include the REUSE parameter for datafiles in a tablespace to indicate that existing files can be reused. If FALSE, omit the REUSEparameter. Defaults to FALSE.
CLUSTER, INDEX,ROLLBACK_SEGMENT, TABLE,TABLESPACE	PCTSPACE	NUMBER	A number representing the percentage by which space allocation for the object type is to be modified. The value is the number of one-hundreths of the current allocation. For example, 100 means 100%. If the object type is TABLESPACE, the following size values are affected: - in file specifications, the value of SIZE - MINIMUM EXTENT - EXTENT MANAGEMENT LOCAL UNIFORM SIZE For other object types, INITIAL and NEXT are affected.

 

select username from dba_users; select dbms_metadataget_ddl('USER','USERNAME') from dual;

select dbms_metadata.get_ddl('USER',U.USERNAME) from dba_users U
 
oracle 11g 怎給沒資料庫中沒有記錄的空表分配段

使用expdp代替exp匯出
給這些沒有分配的表插入一條資料然後刪除，就可以分配空間了