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7 What file types will, by default, be stored in the flash recovery area if it has been defined (Choose all correct answers) A Archive redo log files B Background process trace files C RMAN backup sets D RMAN image copies E Undo data
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Configure ARCHIVELOG Mode
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8 There are several steps involved in transitioning to archivelog mode Put these in the correct order: 1 alter database archivelog 2 alter database open 3 alter system archive log start 4 full backup 5 shutdown immediate 6 startup mount
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5, 6, 1, 2, 4; 3 not necessary 5, 4, 6, 1, 2, 3 6, 1, 3, 5, 4, 2 1, 5, 4, 6, 2; 3 not necessary 5, 6, 1, 2, 3; 4 not necessary
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9 What conditions must hold before an online log file member can be reused if the database is operating in archivelog mode (Choose all correct answers) A It must be inactive B It must be multiplexed C It must be archived D The archive must be multiplexed 10 If the database is in archivelog mode, what will happen if the archiving fails for any reason (Choose the best answer) A The instance will abort B All non-SYSDBA sessions will hang C DML operations will hang D The database will revert to noarchivelog mode
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Check whether your database is configured for recoverability These are the points to look at:
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Online redo log files should be multiplexed The controlfile should be multiplexed The database should be in archivelog mode Archiver processes should be running Archive logs should be multiplexed Checkpoint auto-tuning should be enabled The flash recovery area should be enabled
15:
Backup and Recovery Concepts
SELF TEST ANSWERS
Identify the Types of Failure That Can Occur in an Oracle Database
1 A b: PMON releases resources of failed sessions B d: RMAN manages media recovery C c: the server process rolls back failed statements D a: SMON performs instance recovery All other combinations
Describe Ways to Tune Instance Recovery
2 B If FAST_START_MTTR_TARGET is set to a non-zero value, then checkpoint auto-tuning will be in effect A is wrong because DBWR_IO_SLAVES is for simulating asynchronous disk I/O C is wrong because LOG_CHECKPOINT_INTERVAL will disable the self-tuning mechanism D is wrong because STATISTICS_LEVEL is not relevant to checkpoint auto-tuning 3 C Instance recovery will always require the current online redo log file, and if any others were active, it will need them as well A and B are wrong because they are not sufficient D is wrong because instance recovery never needs an archive redo log file
Identify the Importance of Checkpoints, Redo Log Files, and Archived Log Files
4 A and B Any orderly shutdown will trigger a full checkpoint C is wrong because this would trigger only a partial checkpoint D is wrong because log switches do not trigger checkpoints 5 A and D Anything to do with the controlfile can only be done in nomount or shutdown modes Changing the archivelog mode can only be done in mount mode B is wrong because the online redo log can be configured while the database is open C is wrong because DB_RECOVERY_FILE_DEST is a dynamic parameter 6 D Setting a longer FAST_START_MTTR_TARGET, or not setting it at all, will reduce the need for DBWn to write dirty buffers to disk, which should improve performance A and C are both wrong because they describe the opposite effect B is wrong because the auto-tuning capability does not affect performance, though it will reduce recovery time after instance failure
Lab Answer
Overview of Flash Recovery Area
7 A, C, and D These will go to the flash recovery area, unless directed elsewhere B is wrong because background trace files will go to a directory in the DIAGNOSTIC_DEST directory E is wrong because undo data is stored in the undo tablespace
Configure ARCHIVELOG Mode
8 A This is the correct sequence B, C, and D are wrong because enabling archiving is not necessary (it will occur automatically) E is wrong because a backup is a necessary part of the procedure 9 A and C These are the two conditions B and D While these are certainly good practice, they are not requirements 10 C Once all the online log files need archiving, DML commands will be blocked A is wrong because the instance will remain open B is wrong because only sessions that attempt DML will hang; those running SELECTs can continue D is wrong because this cannot happen automatically
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