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<appendix>
<title>Troubleshooting</title>
<sect1>
<title>Database logfile removal</title>
<para>
Every time a Nix database transaction takes place, Nix writes a record of
this transaction to a <emphasis>log</emphasis> in its database directory
to ensure that the operation can be replayed in case of a application or
system crash. However, without manual intervention, the log grows
indefinitely. Hence, unused log files should be deleted periodically.
This can be accomplished using the following command:
</para>
<screen>
$ rm `db_archive -a -h <replaceable>prefix</replaceable>/var/nix/db`</screen>
</sect1>
</appendix>
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