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2021 Jun 1Z0-053 Study Guide Questions:
Q61. Note the following statements that use flashback technology:
1. FLASHBACK TABLE <table> TO SCN <scn>;
2. SELECT * FROM <table> AS OF SCN 123456;
3. FLASHBACK TABLE <table> TO BEFORE DROP;
4. FLASHBACK DATABASE TO TIMESTAMP <timestamp>;
5. SELECT * FROM <table> VERSIONS AS OF SCN 123456 AND 123999;
Which of these statements will be dependent on the availability of relevant undo data in the undo segment?
A. 1, 2, and 5
B. 1, 3, and 4
C. 2, 3, 4, and 5
D. 1, 2, 3, 4, and 5
Q62. 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
Q63. On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30 am. Which option must you use to check whether a flashback operation can recover the database to the specified time?
A. Check the alert log file
B. Query the V$FLASHBACK_DATABASE_LOG view
C. Query the V$RECOVERY_FILE_DEST_SIZE view
D. Query the V$FLASHBACK_DATABASE_STAT view
E. Check the value assigned for the UNDO_RETENTION parameter
Leading oracle 1z0-053 syllabus:
Q64. 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.
Q65. What is the advantage of setting the ASM-preferred mirror read for the Stretch cluster configuration?
A. It improves resync operations.
B. This feature enables much faster file opens.
C. It improves performance as fewer extent pointers are needed in the shared pool.
D. It improves performance by reading from a copy of an extent closest to the node.
Q66. Which two initialization parameters would you set to enable Automatic Shared Memory Management? (Choose two.)
A. set SHARED_POOL_SIZE to zero
B. set STATISTICS_LEVEL to BASIC
C. set SGA_TARGET to a non-zero value
D. set DB_CACHE_SIZE to a non-zero value
E. set STATISTICS_LEVEL to TYPICAL or ALL
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Q67. Which command do you use to create a recovery-catalog schema?
A. create recovery catalog
B. create catalog
C. build catalog
D. catalog create
E. mount catalog
Q68. Why should you back up a duplicated tablespace after a TSPITR is complete?
A. The tablespace cannot be duplicated or restored to any point in time after the duplication.
B. The tablespace cannot be duplicated or restored to the point in time before the duplication.
C. The entire database cannot be restored after a TSPITR, so a backup is required.
D. You cannot bring the tablespace online until it's been backed up.
E. There is no requirement to do so, as RMAN will back up the tablespace after the TSPITR.
Q69. Your database is in NOARCHIVELOG mode. You start to do a backup, but your users complain that they don't want you to shut down the database to perform the backup. What options are available to you?
A. Put the database in hot backup mode and perform an online backup, including backing up the archived redo logs.
B. Just back up the database datafiles without shutting down the database.
C. You will have to wait until you can shut down the database to perform the backup.
D. Mark each datafile as backup in progress, back them up individually, and then mark them as backup not in progress. No archived redo logs will need to be backed up.
E. Only back up the datafiles that the user will not be touching. Once the user has finished what they were doing, you can shut down the database and back up the datafiles the user changed during the course of the remaining backup
Q70. Which of the following is not a valid calendaring syntax element?
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