barcode scanner javascript html5 Identify the Importance of Checkpoints, Redo Log Files, and Archived Log Files in Software

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Identify the Importance of Checkpoints, Redo Log Files, and Archived Log Files
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Full checkpoints occur only on orderly shutdown or on demand Partial checkpoints occur automatically when necessary Incremental checkpoints advance the point in the redo stream from which recovery must begin after an instance failure The redo log consists of the disk structures for storing change vectors The online log is essential for instance recovery The archive log consists of copies of online log file members, created as they are filled These are essential for datafile recovery after media failure
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Configure ARCHIVELOG Mode
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In ARCHIVELOG mode, an online log file member cannot be overwritten until it has been archived Archive processes start automatically when ARCHIVELOG mode is enabled The mode can only be changed when the database is mounted
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Configure Multiple Archive Log File Destinations to Increase Availability
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The instance parameter(s) LOG_ARCHIVE_DEST_n enable up to ten archive log destinations If LOG_ARCHIVE_DEST_n is not specified, the tenth destination will default to the flash recovery area If Enterprise Edition is not available, there can only be two destinations These are specified with LOG_ARCHIVE_DEST and LOG_ARCHIVE_DUPLEX_DEST Archive logs can go to a local disk directory, to an ASM device, or (through Oracle Net) to a remote standby database
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OCA/OCP Oracle Database 11g All-in-One Exam Guide
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If the number of successful archives does not reach the LOG_ARCHIVE_MIN_ SUCCEED_DEST setting, eventually the database will hang as it cannot overwrite filled online log files
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Overview of the Flash Recovery Area
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The flash recovery area is a default location for all recovery-related files The flash recovery area can be on a local disk file system or an ASM device Permanent occupants of the flash recovery area are controlfile copies and online redo log file members Transient occupants of the flash recovery area are RMAN backups and copies, archive log files, controlfile autobackups, and flashback logs
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Configure the Flash Recovery Area
The initialization parameter DB_RECOVERY_FILE_DEST specifies the location of the flash recovery area The initialization parameter DB_RECOVERY_FILE_DEST_SIZE specifies the maximum size of the flash recovery area When the flash recovery area is configured, the initialization parameter LOG_ ARCHIVE_DEST_10 is automatically set to the flash recovery area location The recommended size of the flash recovery area is the sum of the database size, the size of incremental backups, and the size of all archived log files that have not been copied to tape or to another disk location
Use the Flash Recovery Area
The initialization parameters DB_RECOVERY_FILE_DEST_SIZE and DB_ RECOVERY_FILE_DEST are dynamic The dynamic performance view V$RECOVERY_FILE_DEST shows the total used and reclaimable space on the destination file system or flash recovery area Oracle performs some automatic management of the space in the flash recovery area and keeps track of which files are no longer needed for recovery or other flashback functions
Self Test
1 Different errors require different actions for recovery Match these types of failure (a) through (d) to the appropriate recovery process A through D: (a) (b) Server machine reboots Client machine reboots
14: Configuring the Database for Backup and Recovery
(c) Statement causes a constraint violation (d) Datafile damaged A PMON B RMAN C Session server process D SMON 2 What instance parameter must be set to enable the checkpoint auto-tuning capability (Choose the best answer) A DBWR_IO_SLAVES B FAST_START_MTTR_TARGET PART III C LOG_CHECKPOINT_INTERVAL D STATISTICS_LEVEL 3 Which redo log files may be required for instance recovery (Choose the best answer) A Only the current online redo log file B Only the active online redo file(s) C Both current and active online redo log file(s) D Current and active online redo log files, and possibly archive redo log files 4 When will a full checkpoint occur (Choose all correct answers) A As part of a NORMAL shutdown B As part of an IMMEDIATE shutdown C When a tablespace is taken offline D When a log switch occurs 5 Which of these operations cannot be accomplished while the database is open (Choose all correct answers) A Adding a controlfile copy B Adding an online log file member C Changing the location of the flash recovery area D Changing the archivelog mode of the database 6 How can you use checkpointing to improve performance A Frequent checkpoints will reduce the workload on the DBWn B Enabling checkpoint auto-tuning will optimize disk I/O C Reducing the MTTR will reduce disk I/O D Increasing the MTTR will reduce disk I/O
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