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<h1><a name="kanchor76"></a>Defragmentation Configuration</h1>
<p>You can configure the defragmentation processes for your needs. This topic discusses the available configuration options.</p>
<p>First you need to configure which database file to defragment. <a href="configuration/database_files.htm" target="" title="" alt="" class="MCXref">See "Original Database And Backup"</a></p>
<p>It's also recommended to use the db4o database configuration for the defragmentation process. This ensures that all low level settings which influence the database-file layout are used. <a href="configuration/database_configuration.htm" target="" title="" alt="" class="MCXref">See "Database Configuration"</a></p>
<p>When you defragment large database you should configure a commit-frequency to speed up the defragmentation process. <a href="configuration/commit_frequency.htm" target="" title="" alt="" class="MCXref">See "Commit Frequency"</a></p>
<p>If you have refractored your classes you might want to remove old meta data. This is possible with the class filters. <a href="configuration/class_filter.htm" target="" title="" alt="" class="MCXref">See "Class Filter"</a> </p>
<p>By default the backup file isn't deleted after a successful defragmentation. You can change that. <a href="configuration/delete_backup.htm" target="" title="" alt="" class="MCXref">See "Delete The Backup"</a></p>
<p>You can force a database update before defragmenting the database-file. <a href="configuration/upgrade_db.htm" target="" title="" alt="" class="MCXref">See "Upgrade Database File"</a></p>
<p>You can disable the read-only more the for backup file. <a href="configuration/disable_read_only.htm" target="" title="" alt="" class="MCXref">See "Disable Read Only Mode"</a></p>
<p>If you want to have different storage implementation for the old database file and the new defragmented database file you can configure a separate storage. <a href="configuration/storage_backupdb.htm" target="" title="" alt="" class="MCXref">See "Configure Storage for Backup File"</a></p>
<p>You can change the id-mapping implementation for the defragmentation-process. <a href="configuration/id_mapping.htm" target="" title="" alt="" class="MCXref">See "Configure IDMapping"</a></p>
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