--得到所有表空间的ddl语句
SELECT DBMS_METADATA.GET_DDL('TABLESPACE', TS.tablespace_name)
FROM DBA_TABLESPACES TS;
--得到所有创建用户的ddl语句
SELECT DBMS_METADATA.GET_DDL('USER',U.username)
FROM DBA_USERS U;
--所支持的45个OBJECT TYPE：
Type Name Meaning
------------------------------ ------------------------------
AUDIT_OBJ audits of schema objects
AUDIT audits of SQL statements
ASSOCIATION associate statistics
CLUSTER clusters
COMMENT comments
CONSTRAINT constraints
CONTEXT application contexts
DB_LINK database links
DEFAULT_ROLE default roles
DIMENSION dimensions
DIRECTORY directories
FUNCTION stored functions
INDEX indexes
INDEXTYPE indextypes
JAVA_SOURCE Java sources
LIBRARY external procedure libraries
MATERIALIZED_VIEW materialized views
MATERIALIZED_VIEW_LOG materialized view logs
OBJECT_GRANT object grants
OPERATOR operators
OUTLINE stored outlines
PACKAGE stored packages
PACKAGE_SPEC package specifications
PACKAGE_BODY package bodies
PROCEDURE stored procedures
PROFILE profiles
PROXY proxy authentications
REF_CONSTRAINT referential constraint
ROLE roles
ROLE_GRANT role grants
ROLLBACK_SEGMENT rollback segments
SEQUENCE sequences
SYNONYM synonyms
SYSTEM_GRANT system privilege grants
TABLE tables
TABLESPACE tablespaces
TABLESPACE_QUOTA tablespace quotas
TRIGGER triggers
TRUSTED_DB_LINK trusted links
TYPE user-defined types
TYPE_SPEC type specifications
TYPE_BODY type bodies
USER users
VIEW views
XMLSCHEMA XML schema