Committing a transaction
Flashing back a transaction
Recovering a failed transaction
Running a read-consistent query
Changing a tablespace status from READ ONLY to READ WRITE
ENCRYPT_TS is an encrypted tablespace that contains tables with data. Which statement is true regarding the effect of queries and data manipulation language (DML) statements on the encrypted data in the tables?（）A. The data is decrypted during SORT and JOIN operations.B. The data remains encrypted when it is read into memory.C. The data remains encrypted when it is stored in the redo logs.D. The data remains encrypted in the UNDO tablespace provided that the UNDO tablespace was created with the encryption option enabled.
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Which two are the prerequisites to enable Flashback Data Archive?() (Choose two.)A. Database must be running in archivelog mode.B. Automatic undo management must be enabled.C. Undo retention guarantee must be enabled.D. The tablespace on which the Flashback Data Archive is created must be managed with Automatic Segment Space Management (ASSM).
You must track all transactions that modify certain tables in the sales schema for at least three years.Automatic undo management is enabled for the database with a retention of one day.Which two must you do to track the transactions?（）A. Enable supplemental logging for the database.B. Specify undo retention guarantee for the database.C. Create a Flashback Data Archive in the tablespace where the tables are stored.D. Create a Flashback Data Archive in any suitable tablespace.E. Enable Flashback Data Archiving for the tables that require tracking
Which are the two prerequisites before setting up Flashback Data Archive? （）(Choose two.)A、Flash recovery area must be definedB、Undo retention guarantee must be enabled.C、Database must be running in archivelog mode.D、Automatic undo management must be enabled.E、The tablespace in which the Flashback Data Archive is created must have automatic segment space Management (ASSM).
In your database， UNDO_RETENTION has been set to 600 sec and UNDO tablespace is configured for RETENTION GUARANTEE. Which statement regarding RETENTION GUARANTEE is true？ （）A、Undo data is retained until the next full database backup.B、No committed undo data will be overwritten for 10 minutes.C、Committed undo data will be kept forever if not overwritten within 600 seconds.D、Guarantees that requested undo information are available until the instance is shut down.
Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec. You executed the following command to enable retention guarantee： SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE; What effect would this statement have on the database？（）A、The extents in undo tablespace retain data until the next full database backup.B、The extents containing committed data in the undo tablespace are never overwritten.C、The extents which no longer contain uncommitted data in the undo tablespace are not overwritten for at least15 minutes.D、The extents containing committed data in the undo tablespace are not overwritten until the instance is shut down.
You work as a database administrator for Certkiller .com. The UNDO_RETENTION parameter in your database is set to 1000 and undoretention is not guaranteed. Which statement regarding retention of undo data is correct？（）A、Undo data becomes obsolete after 1，000 seconds.B、Undo data gets refreshed after 1，000 seconds.C、Undo data will be stored permanently after 1，000 seconds.D、Committed undo data would be retained for 1，000 seconds if free undo space is available.E、Undo data will be retained in the UNDOtablespacefor 1，000 seconds， then it gets movedmovedto the TEMPORARYtablespaceto provide read consistency.
