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Clarification for delta restore documentation to indicate that files may be removed.

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Brian Faherty 2016-03-09 11:27:08 -05:00 committed by David Steele
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commit 87dd0a127f
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doc/xml/user-guide.xml
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@ -703,7 +703,7 @@
<section id="option-delta">
<title>Delta Option</title>
<p><link section="/quickstart/perform-restore">Restore a Backup</link> in <link section="/quickstart">Quick Start</link> required the database cluster directory to be cleaned before the <cmd>restore</cmd> could be performed. The <br-option>delta</br-option> allows <backrest/> to automatically determine which files in the database cluster directory can be preserved and which ones need to be restored from the backup. This is accomplished by calculating a <link url="https://en.wikipedia.org/wiki/SHA-1">SHA-1</link> cryptographic hash for each file in the database cluster directory. If the <id>SHA-1</id> hash does not match the hash stored in the backup then that file will be restored. This operation is very efficient when combined with the <br-option>thread-max</br-option> option. Since the <postgres/> process is shut down during the restore, a larger number of threads can be used than might be desirable during a backup when the <postgres/> process is running.</p>
<p><link section="/quickstart/perform-restore">Restore a Backup</link> in <link section="/quickstart">Quick Start</link> required the database cluster directory to be cleaned before the <cmd>restore</cmd> could be performed. The <br-option>delta</br-option> option allows <backrest/> to automatically determine which files in the database cluster directory can be preserved and which ones need to be restored from the backup &amp;mdash; it also <i>removes</i> files not present in the backup manifest so it will dispose of divergent changes. This is accomplished by calculating a <link url="https://en.wikipedia.org/wiki/SHA-1">SHA-1</link> cryptographic hash for each file in the database cluster directory. If the <id>SHA-1</id> hash does not match the hash stored in the backup then that file will be restored. This operation is very efficient when combined with the <br-option>thread-max</br-option> option. Since the <postgres/> process is shut down during the restore, a larger number of threads can be used than might be desirable during a backup when the <postgres/> process is running.</p>
<execute-list host="{[host-db-master]}">
<title>Stop the {[postgres-cluster-demo]} cluster, perform delta restore</title>