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<h1>22. Virtuoso Functions Guide - DB.DBA.RDF_RESTORE_METADATA</h1>
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<h2>DB.DBA.RDF_RESTORE_METADATA</h2>
<div class="refpurpose">Restores RDF metadata (descriptions of RDF Views and the like) from previously saved backup.</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">DB.DBA.RDF_RESTORE_METADATA</span>
</span>
(<span class="paramdef">in <span class="parameter">read_from_file</span> integer</span>,
<span class="paramdef">in <span class="parameter">backup_name</span> varchar</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>This restores RDF metadata from specified file or graph in RDF storage.
The file or graph should be previously created by
<a href="fn_rdf_backup_metadata.html">DB.DBA.RDF_BACKUP_METADATA()</a>.
It is usually safe to restore metadata from backup made by some previous version of Virtuoso server but
it is good idea to call <a href="fn_rdf_audit_metadata.html">DB.DBA.RDF_AUDIT_METADATA()</a> after such restore.
</p>
<p>When the procedure is executed on the server that continues to serve user requests during the maintenance then SPARQL query compiler may interrupt query compilations or create queries that will return incomplete result sets.
These queries may be cached till the end of metadata update procedure but the cache is flushed when the update is complete, so possible errors will be transient.
If even transient errors are not appropriate then do RDF metadata update with all precautions usual for changing database schema of an application.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">read_from_file – </span>
This flag specifies the type of the origin: it should be nonzero for file, zero for graph.
</div>
<div class="refsect2">
<span class="refsect2title">backup_name – </span>
Name of backup file or graph as it is returned by the call of
<a href="fn_rdf_backup_metadata.html">DB.DBA.RDF_BACKUP_METADATA()</a> that created the backup.
</div>
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<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>The return value is not specified and may be changed in future versions.</p>
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<div class="refsect1title">See Also</div>
<p>
<a href="fn_rdf_audit_metadata.html">DB.DBA.RDF_AUDIT_METADATA</a>
</p>
<p>
<a href="fn_rdf_backup_metadata.html">DB.DBA.RDF_BACKUP_METADATA</a>
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