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List:       fdo-internals
Subject:    Re: [fdo-internals] SHP performance problem may be due to .idx
From:       Greg Boone <greg.boone () autodesk ! com>
Date:       2012-09-20 17:56:58
Message-ID: C9E56534F38E29429729DBDFFD90C5E4203C1E98 () 005-TK5MPN1-012 ! MGDADSK ! autodesk ! com
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Taking a quick look at the code, what could be happening is that the index file \
header is updated with the current bounding box extent of the data file at the time \
the connection is made. 

This update may be replacing the existing extent with the exact same extent. 

Greg

-----Original Message-----
From: fdo-internals-bounces@lists.osgeo.org \
                [mailto:fdo-internals-bounces@lists.osgeo.org] On Behalf Of everling
Sent: Thursday, September 20, 2012 12:51 PM
To: fdo-internals@lists.osgeo.org
Subject: [fdo-internals] SHP performance problem may be due to .idx

Hello. Trevor suggested that the FDO Internals may be a better list for the following \
bug report that I originally posted in the MapGuide Internals list.

> I don't know if it is a real bug or not but a search of the mailing 
> list archives have revealed nothing so I'll bring it up here for discussion.
> 
> Bug report:
> 1. Whenever I preview my SHP feature source, the associated *.idx file 
> is modified.
> 2. This is true for managed or unmanaged files, the relevant *.idx 
> files are always modified.
> 3. If the SHP feature source is pointing to an unmanaged folder, all 
> *.idx files within the directory are modified even if you are viewing 
> the contents of only one SHP file or previewing the feature source 
> with Maestro.
> 4. The contents of the *.idx files are unchanged. Confirmed with MD5 
> file checksums.
> 4. Reproduced with MGOS 2.2 and MGOS 2.4 RC2 on Windows 7.
> 
> I think MGOS recreates the idx files on every view and that this is 
> the reason that MGOS performs poorly on SHP files, especially when 
> working with unmanaged directories. Is this a real bug and is it 
> fixable in time for MGOS 2.4?
> 
> Best regards.

Best regards.



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