Oracle OCP 1Z0 053 Q430(Transfer Database&DBMS_TDB.CHECK_DB)
430.Which of the following is a prerequisite for running DBMS_TDB.CHECK_DB to a successful
completion?
A. The database must be in read-write mode.
B. The database must have no external files.
C. The database must open in read-only mode.
D. The database must be mounted but not opened.
Answer: C
这个函数是用于检查是否可以将一个数据库transfer到另外一个平台。
参考：http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_tdb.htm#ARPLS68864
而执行结果如下
SQL> set serveroutput on
SQL> declare
2 v_1 boolean;
3 begin
4 v_1 := dbms_tdb.check_db;
5 end;
6 /
Database is not open in READ-ONLY mode. Open the database in READ-ONLY mode and
retry.
PL/SQL procedure successfully completed.
completion?
A. The database must be in read-write mode.
B. The database must have no external files.
C. The database must open in read-only mode.
D. The database must be mounted but not opened.
Answer: C
这个函数是用于检查是否可以将一个数据库transfer到另外一个平台。
参考：http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_tdb.htm#ARPLS68864
而执行结果如下
SQL> set serveroutput on
SQL> declare
2 v_1 boolean;
3 begin
4 v_1 := dbms_tdb.check_db;
5 end;
6 /
Database is not open in READ-ONLY mode. Open the database in READ-ONLY mode and
retry.
PL/SQL procedure successfully completed.
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