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Managing PostgreSQL on Windows
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Figure 4-16 The table autovacuum features
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If there is not a lot of activity on a particular table, you can turn off the autovacuum feature in the postgresqlconf file and manually vacuum your tables when necessary To manually vacuum a table or database, right-click the table or database object and select Maintenance The Maintain Table (or Database) window appears, as shown in Figure 4-17 The Maintain Table and Database windows allow you to Vacuum the table Analyze the table to determine if vacuuming is necessary Reindex all indexes for the table Besides vacuuming deleted records from a table, reindexing any created table indexes can also speed up query performance for a table As new records are added, the index can become disjointed By reindexing, PostgreSQL can reorganize the index values to maximize query performance
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Figure 4-17 The Maintain Database window
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BACKUPS AND RESTORES
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Part of the ACID test of durability (discussed in 1) is if the database is able to recover from a catastrophic event, such as a disk crash To plan for those types of events, it is always a good idea to have a backup of the database In 3, the pg_dump and pg_dumpall utilities were discussed These programs allow you to back up the database structure and data to an alternative location The pg_dumpall utility allows you to back up the entire PostgreSQL system, including Login and Group Roles The pg_dump utility is used to back up individual databases The pgAdmin III program tries to make your life even easier by incorporating a graphical front end to the pg_dump utility Unfortunately, it does not provide an interface to the pg_dumpall utility, so you should still manually create a full backup of the entire PostgreSQL system on a regular basis However, backing up your databases is as easy as filling in the proper forms and submitting the job This section describes how to back up and restore a database using the pgAdmin III utility
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Managing PostgreSQL on Windows
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Performing a Backup
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To back up a database, right-click the database object and select Backup from the menu The Backup Database window appears, as shown in Figure 4-18 From this window you can select the options for your backup, including the filename of the backup file, the type of backup (as discussed in the pg_dump section in 3), and the parts backed up By default, the pg_dump utility uses the COPY SQL commands to restore table data If you need to restore the database on a different database system, you should use the INSERT commands feature by checking the check box If you do select the Insert Commands check box, you will not be able to store OIDs either, since OIDs cannot be copied using standard SQL INSERT commands After the backup completes, click the Messages tab and view the backup results
Figure 4-18 The Backup Database window
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Restoring a Database
The other side of backing up your database is the ability to restore the database The backup file created by the pgAdmin III program can be restored using the pg_restore utility, discussed in 3 This file can be used to restore the database on any PostgreSQL platform on any server This makes for a powerful tool in migrating databases to larger servers on different platforms With the pg_restore utility, all you need to do is run the utility with the backup file The objects that are contained in the backup file are automatically restored Unfortunately, in pgAdmin III, to restore a database, schema, or table, you must have a similar skeleton object available to perform the restore First, create a new object using the same name as the original object that was lost (you can easily copy an object by creating an object with a different name and performing the restore on that object) You do not have to worry about setting too many options, as they will be restored during the restore process Next, right-click the new object and select Restore from the menu The Restore Database window, shown in Figure 4-19, appears
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