元數據（Metadata：即保留在數據字典中的數據）API

select dbms_metadata.get_ddl('TABLE','RS_DEPT','DBO') dd from dual; 結果爲: CREATE TABLE "DBO"."RS_DEPT" ( "DEPT_ID" NUMBER(10,0) NOT NULL ENABLE, "DEPT_CODE" VARCHAR2(30), "DEPT_NAME" VARCHAR2(32) NOT NULL ENABLE, "NAME_SPELL" VARCHAR2(20), "UPPER_DEPT_ID" NUMBER(10,0), "ESTABLISH_DATE" DATE, "ABORLISH_DATE" DATE, "DEPT_LEVEL_FLAG" CHAR(1), "USE_FLAG" CHAR(1), "EXAMINE_APRROVE_UNIT" VARCHAR2(60), "EXAMINE_APRROVE_NO" VARCHAR2(40), "REMARK" VARCHAR2(255), "CREATE_DEPT_ID" NUMBER(10,0), "CREATE_ACCOUNT" VARCHAR2(16), "XS_DEPT_LEVEL_FLAG" CHAR(1), "DEPT_DESCRIBE" VARCHAR2(255), "RPT_DEPT_LEVEL_FLAG" CHAR(1), CONSTRAINT "PK_RS_DEPT" PRIMARY KEY ("DEPT_ID") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE(INITIAL 262144 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "INDEXES" ENABLE, CONSTRAINT "FK_RS_DEPT_REF_584_SYSRIGHT" FOREIGN KEY ("DEPT_LEVEL_FLAG") REFERENCES "DBO"."SYSRIGHT_DEPT_TYPE" ("DEPT_LEVEL_FLAG") ENABLE, CONSTRAINT "FK_RS_DEPT_REF_6312_RS_DEPT" FOREIGN KEY ("UPPER_DEPT_ID") REFERENCES "DBO"."RS_DEPT" ("DEPT_ID") ENABLE ) 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) TABLESPACE "YD_DATA"