barcode reader for java free download Overview of Flash Recovery Area in Software

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Overview of Flash Recovery Area
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The database backup routines should also include backing up the flash recovery area to tape, thus implementing a strategy of primary, secondary, and tertiary storage:
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Primary storage is the live database, on disk Secondary storage is a copy of the database plus files needed for fast recovery Tertiary storage is long-term backups in a tape library
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RMAN can manage the whole cycle: backup of the database from primary to secondary and migration of backups from secondary to tertiary storage Such a system can be implemented in a fashion that will allow near-instant recovery following a failure, combined with the ability to take the database back in time if this is ever necessary
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EXERCISE 15-4 Investigate the Flash Recovery Area Configuration
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In this exercise, you will investigate the configuration of the flash recovery area Using your Database Control session, continue from the last step in Exercise 15-3 1 Navigate to the bottom part of the Recovery Settings window, which shows the flash recovery area configuration, as shown in this illustration:
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Backup and Recovery Concepts
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2 Interpret the display: note the settings for the instance parameters DB_RECOVERY_FILE_DEST and DB_RECOVERY_FILE_DEST_SIZE These are D:\app\oracle\flash_recovery_area and 2 GB in the illustration Note the space free and the space reclaimable: 410 MB and 185 MB in the illustration Note the allocation of space: in the illustration, 69 percent of the flash recovery area is taken up with backup pieces, 15 percent with image copies 3 If the flash recovery area parameters are not set, set them now The directory must be one on which the operating system account that owns the Oracle software has full permissions, and the size should be at least 2 GB
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Configure ARCHIVELOG Mode
A database is by default created in noarchivelog mode The transition to archivelog mode is straightforward, but it does require downtime The process is
Shut down the database, cleanly Start up in mount mode Issue the command ALTER DATABASE ARCHIVELOG Open the database Perform a full backup
This sequence can be followed either with SQL*Plus (as shown in Figure 15-5) or with Database Control Generally, more configuration will be required Following a default installation, the archive logs will be written to only one destination, which will be the flash recovery area If the parameters that enable the flash recovery area have not been set, they will go to a platform specific destination (the $ORACLE_HOME/dbs directory for Unix systems) the final command in Figure 15-5, ARCHIVE LOG LIST, shows summary information about the archiving
Con gure ARCHIVELOG Mode
FIGURE 15-5
Transitioning a database to archivelog mode with SQL*Plus
configuration: that the database is running in archivelog mode; that the ARCn process is running; and that the archive log files are being written to the flash recovery area Additional changes would usually include adjusting instance parameters to set up a second archive log file destination for multiplexed copies, and defining a naming template for The change to archivelog generating archive log file names mode can only be done in mount mode, A full backup is an essential step for the after a clean shutdown transition to archivelog mode Following the transition, all backups made earlier are useless The backup can be made while the database is open or closed, but until it is made, the database is not protected at all If the shutdown is not clean (for instance, SHUTDOWN ABORT), the transition will fail Not a problem open the database, and shut it down again: this time, cleanly
15:
Backup and Recovery Concepts
INSIDE THE EXAM
Backup and Recovery Concepts
Backup, restore, recovery, and flashback (in all their forms) are covered in much greater detail in the second DBA OCP examination At this stage, all that should be required is an understanding of the architecture and the general principles However, do not skimp on this, because the usual rule applies: if you understand the architecture, you can work out the rest So, you must be absolutely clear on the memory structures and the processes involved The foundation for this is an understanding of the mechanisms of rollback and redo: how they are implemented in the SGA, and in the redo log and the datafiles Related to this is COMMIT processing The content of this chapter is not demanding, but it is the foundation on which the next two chapters (and much of the content of the next examination) are built
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