21、
21.You are managing an Oracle Database 11g instance. You want to create a duplicate database for testing purpose. What are the prerequisites for performing the active database duplication? (Choose all that apply.) A. The source database backup must be copied over the net for test database. B. The source database must be run in ARCHIVELOG mode if the database is open. C. The source database must be shut down cleanly if the database is in mounted state. D. A net service name should be set up and a listener configured with the target as well as the source database.
22、
22.An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command: SQL>CREATE INDEX ord_custname_ix ON orders(custname); The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause. You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test. Which is the most efficient method of performing this task? A. disabling the index B. making the index invisible C. making the index unusable D. using the MONITORING USAGE clause for the index
23、
23.Which tasks can be accomplished using the DBMS_LOB. SETOPTIONS procedure? A. only encryption and compression settings for all SecureFile LOBs B. only encryption and deduplication settings for only SecureFile CLOBs C. deduplication, encryption, and compression settings for all SecureFile LOBs D. deduplication, encryption, and compression settings only for SecureFile CLOBs
24、
24.Which of the following information will be gathered by the SQL Test Case Builder for the problems pertaining to SQL-related problems? (Choose all that apply.) A. ADR diagnostic files B. all the optimizer statistics C. initialization parameter settings D. PL/SQL functions, procedures, and packages E. the table and index definitions and actual data
25、
25.You enabled Flashback Data Archive on the INVENTORY table. Which DDL operation is supported on the table after enabling Flashback Data Archive? A. Drop the table. B. Partition the table C. Truncate the table. D. Add a column to the table. E. Rename a column in the table.