Hi
The answer is the same as mine would have been, but the "definite
degradation of performance" is primary a disk isue on the server side.
Faster disk with a lot of read heads means faster response (and one way to
achive this is to use a stripe set or a RAID5 disk solution) - of course
more than 50 users on a 10 Mb ethernet is an isue, but this would bee the
case even with simple office applications or print.
Ole Gregor, Viborg Amt (County), Denmark
[EMAIL PROTECTED] TLF. (+45) 87271307
> -----Original Message-----
> From: Bob Young [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, July 28, 1999 11:33 PM
> To: Darren Kisner
> Cc: [EMAIL PROTECTED]
> Subject: Re: MI File access across a network
>
> Hi Darren
>
> If you are looking at the map only, then MapInfo will only really need
> to read the map file. This file may be huge but it will only need to
> read part of it. Basically the file contains index blocks that contain
> MBRs ( Minimum bounding rectangles ) . With about twenty blocks per
> level you dont have to have too many blocks too really break down your
> geography!
>
> So only a small part of the map file needs to get read - all index
> blocks to blocks of objects taht intersect the screen plus the blocks of
> objects themselves that intersect the screen. However this will still be
> more than say MapXtreme as in this case the map is built on the server
> and literally just the screen image is sent.
>
> Some of out customers have 50 plus seats on a network and there is a
> definite degradation of performance. However considering the size of the
> files the technology is still very impressive!
>
> Hope this helps.
>
>
> Bob
>
>
>
>
>
> In message <[EMAIL PROTECTED]>, Darren Kisner
> <[EMAIL PROTECTED]> writes
> >This transmission contains information which may be confidential and
> >which may also be privileged. It is intended for the named addressee
> >only. Unless you are the named addressee, or authorised to receive it
> >on behalf of the addressee you may not copy or use it, or disclose it
> >to anyone else. If you have received this transmission in error please
> >contact the sender. Thank you for your cooperation.
> >Hi all
> >
> >My question refers to how MapInfo accesses and queries files. I am
> setting up an
> >application in a multi-user environment and my clients need information
> on
> >potential network traffic.
> >
> >Assuming Mapinfo tables are stored on a network drive and a user accesses
> them
> >using Mapinfo on a local machine:
> >
> > - When a table is opened (using MB command Open Table), but not browsed,
> is
> >the whole file moved across the network to local machine or just the TAB
> file or
> >something else?
> > - When a table is opened in a Map Browser is the whole table accessed or
> just
> >the object information?
> > - If the user runs a query on an open table does the whole table need to
> be in
> >the local machines memory?
> >
> >I hope someone can make some sense of this! Our base data tables range
> from 25
> >to 75mb in size, which is where the concern over network traffic arises.
> >
> >Thanks in advance
> >
> >Darren
> >
> >
> >Darren Kisner [ [EMAIL PROTECTED] ]
> >AEA Technology Rail
> >[tel] 0171 904 3505
> >[fax] 0171 904 3504
> >
> >
> >----------------------------------------------------------------------
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>
> --
> Bob Young
> ----------------------------------------------------------------------
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