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65 lines
5.3 KiB
65 lines
5.3 KiB
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html>
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<head>
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<title>Microsoft Index Server Guide: Scanning</title>
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<meta name="FORMATTER" content="Microsoft FrontPage 1.1">
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<meta name="GENERATOR" content="Microsoft FrontPage 1.1">
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</head>
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<body bgcolor="#FFFFFF">
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<!--Headerbegin--><p align=center><a name="TOP"><img src="onepix.gif" alt="Space" align=middle width=1 height=1></a> <a href="default.htm#Top"><img src="toc.gif" alt=" Contents" align=middle border=0 width=89 height=31></a> <a href="filtrhlp.htm"><img src="previous.gif" alt="Previous" align=middle border=0 width=32 height=31></a> <a href="webhits.htm"><img src="next.gif" alt="Next" align=middle border=0 width=32 height=31></a> </p>
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<hr>
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<!--Headerend--><p><a name="Scanning"><font size=6><strong>Scanning</strong></font></a></p>
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<p align=left><!--Chaptoc--></p>
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<blockquote>
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<p><a href="scanhlp.htm#FullScan">Full Scan</a> <br>
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<a href="scanhlp.htm#IncrementalScan">Incremental Scan</a> <br>
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<a href="scanhlp.htm#ForceScan">Forcing a Scan from Administration Pages</a> <br>
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</p>
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</blockquote>
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<hr>
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<!--ChaptocEnd--><p>The process of inventorying the virtual roots (and the physical directories pointed to by the virtual roots) to determine which
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documents should be indexed is called <em>scanning</em>. By default, all readable virtual roots are indexed. If some readable virtual
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roots should not be indexed, they can be <a href="adminhlp.htm#AddVRoot">configured</a> by the administrator.</p>
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<p>There are two basic types of scans:</p>
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<ul>
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<li><a href="#FullScan">Full Scan</a></li>
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<li><a href="#IncrementalScan">Incremental Scan</a></li>
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</ul>
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<p>There is no manual intervention needed for either of the scans, because Microsoft Index Server automatically detects what
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type of scan to do and does it without user intervention.</p>
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<hr>
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<h1><a href="#TOP"><img src="up.gif" alt="To Top" align=middle border=0 width=14 height=11></a><a name="FullScan">Full Scan</a></h1>
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<p>In a full scan, all the documents in the directories that are inventoried are added to the list of documents to be filtered. A full
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scan is performed the first time a directory is added to the list of indexed directories. A full scan is also performed as part of
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recovery if a serious error occurs.</p>
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<hr>
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<h1><a href="#TOP"><img src="up.gif" alt="To Top" align=middle border=0 width=14 height=11></a><a name="IncrementalScan">Incremental Scan</a></h1>
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<p>In an incremental scan, only the documents that were modifed since the last time they were filtered are added to the list of
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documents to be filtered. On startup of Index Server, an incremental scan is performed on all the <em>indexed directories</em>. This
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allows Index Server to determine which files were modifed when it was not running.</p>
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<p>During normal operation of Index Server, all changes to the documents in the indexed directories are automatically tracked if
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the indexed directories are on computers running Windows NT. <em>Indexed directories</em> are the set of all directories in the
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indexed virtual roots. Some file servers, such as Novell NetWare and Microsoft® Windows® 95 file server, do not support
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automatic change notification. When a virtual root points to a remote share that does not support automatic change notification,
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Index Server does periodic scans of that share. The frequency of these periodic scans is controlled by the registry setting
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<a href="reghelp.htm#ForcedNetPathScanInterval">ForcedNetPathScanInterval</a><em>.</em></p>
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<p>Sometimes an incremental scan is also performed if the system <em>loses</em> change notifications. This can happen if the update rate of
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documents is very high and the buffer used to get change notifications from Windows NT overflows.</p>
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<hr>
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<h1><a href="#TOP"><img src="up.gif" alt="To Top" align=middle border=0 width=14 height=11></a><a name="ForceScan">Forcing a Scan from Administration Pages</a></h1>
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<p>An administrator can force either a full scan or an incremental scan on any of the indexed virtual roots by choosing the <em>Force
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scan virtual roots </em>option from the <a href="/srchadm/admin.htm">administration page</a>. This will show the list of virtual roots. By default, no scan will be
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selected for any of the virtual roots. You can select the appropriate type of scan for the virtual root and click <em>Submit</em>. </p>
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<p>You can force a full scan when a new <a href="filtrhlp.htm#FilterDLLs">filter DLL</a> is installed or if you do not want to wait for the periodic scan on a remote
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virtual root. <font color="#400040">Queries will continue to return documents, but query speed may slow down during the scanning and filtering.</font></p>
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<p><font color="#400040"><strong>Note   </strong></font>Forcing a full scan results in all the files in a scope to be refiltered and could take a long time. </p>
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<!--Footerbegin--><hr>
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<p align=center><a href="default.htm#Top"><img src="toc.gif" alt=" Contents" align=middle border=0 width=89 height=31></a> <a href="filtrhlp.htm"><img src="previous.gif" alt="Previous" align=middle border=0 width=32 height=31></a> <a href="#TOP"><img src="up_end.gif" alt="To Top" align=middle border=0 width=32 height=31></a> <a href="webhits.htm"><img src="next.gif" alt="Next" align=middle border=0 width=32 height=31></a> </p>
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<hr>
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<p align=center><em>© 1996 by Microsoft Corporation. All rights reserved.<!--Footerend--></em></p>
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</body>
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</html>
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