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NEW QUESTION 23
Which two are true concerning a multitenant container database with three pluggable database?
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION 24
You performed an incremental level 0 backup of a database:
RMAN > BACKUP INCREMENTAL LEVEL 0 DATABASE;
To enable block change tracking after the incremental level 0 backup, you issued this command:
SQL > ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE
'/mydir/rman_change_track.f';
To perform an incremental level 1 cumulative backup, you issued this command:
RMAN> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE;
Which three statements are true?
Explanation:
Explanation/Reference:
Explanation:
Oracle Block Change Tracking
Once enabled; this new 10g feature records the modified since last backup and stores the log of it in a block change tracking file using the CTW (Change Tracking Writer) process. During backups RMAN uses the log file to identify the specific blocks that must be backed up. This improves RMAN's performance as it does not have to scan whole datafiles to detect changed blocks. Logging of changed blocks is performed by the CTRW process which is also responsible for writing data to the block change tracking file.
Note:
* An incremental level 0 backup backs up all blocks that have ever been in use in this database.
NEW QUESTION 25
A senior DBA asked you to execute the following command to improve performance:
SQL> ALTER TABLE subscribe log STORAGE (BUFFER_POOL recycle);
You checked the data in the SUBSCRIBE_LOG table and found that it is a large table containing one million rows.
What could be a reason for this recommendation?
Explanation:
Explanation
The most of the rows in SUBSCRIBE_LOG table are accessed once a week.
NEW QUESTION 26
......
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NEW QUESTION 23
Which two are true concerning a multitenant container database with three pluggable database?
- A. The pluggable databases are patched together.
- B. Pluggable databases are only used for database consolidation.
- C. All administration tasks must be done to a specific pluggable database.
- D. The pluggable databases increase patching time.
- E. The pluggable databases reduce administration effort.
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION 24
You performed an incremental level 0 backup of a database:
RMAN > BACKUP INCREMENTAL LEVEL 0 DATABASE;
To enable block change tracking after the incremental level 0 backup, you issued this command:
SQL > ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE
'/mydir/rman_change_track.f';
To perform an incremental level 1 cumulative backup, you issued this command:
RMAN> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE;
Which three statements are true?
- A. The change tracking file must always be backed up when you perform a full database backup.
- B. Block change tracking will always reduce I/O performed during cumulative incremental backups.
- C. More than one database block may be read by an incremental backup for a change made to a single block.
- D. Backup change tracking will sometimes reduce I/O performed during cumulative incremental backups.
- E. The incremental level 1 backup that immediately follows the enabling of block change tracking will not read the change tracking file to discover changed blocks.
Explanation:
Explanation/Reference:
Explanation:
Oracle Block Change Tracking
Once enabled; this new 10g feature records the modified since last backup and stores the log of it in a block change tracking file using the CTW (Change Tracking Writer) process. During backups RMAN uses the log file to identify the specific blocks that must be backed up. This improves RMAN's performance as it does not have to scan whole datafiles to detect changed blocks. Logging of changed blocks is performed by the CTRW process which is also responsible for writing data to the block change tracking file.
Note:
* An incremental level 0 backup backs up all blocks that have ever been in use in this database.
NEW QUESTION 25
A senior DBA asked you to execute the following command to improve performance:
SQL> ALTER TABLE subscribe log STORAGE (BUFFER_POOL recycle);
You checked the data in the SUBSCRIBE_LOG table and found that it is a large table containing one million rows.
What could be a reason for this recommendation?
- A. All the queries on the SUBSCRIBE_LOG table are rewritten to a materialized view.
- B. The keep pool is not configured.
- C. Automatic Shared Memory Management is not enabled.
- D. The data blocks in the SUBSCRIBE_LOG table are rarely accessed.
- E. Automatic Workarea Management is not configured.
Explanation:
Explanation
The most of the rows in SUBSCRIBE_LOG table are accessed once a week.
NEW QUESTION 26
......