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odbc memory use

We recently deployed an upgraded application on all new hardware. The infrastructure performed exceptionally well as we monitored cpu & memory use. After 4 days my application team advised me they needed to roll back the odbc driver on the servers. The performance on the servers is now almost as bad as it was before the upgrade. The rollback process took maybe 5 minutes per server. Supposedly that's all they did to the servers. We went from Intel x32 dual processor blade servers w/4gb ram running Win2k3 standard to AMD dual core blades w/8gb ram running Win2k3 enterprise. These things ran like a champ for almost a week. I saw upwards of 150users per server not even touch the paging file. After the rollback with 45 users I'm seeing 26gb of page file being used. Any thoughts? I'm trying to work with the application team to troubleshoot this and they claim they had to rollback because of some data problems they were having with the newest odbc driver. I've seen some references to memory vs disk based tables related to odbc and am wondering if this is our issue. The newest odbc was somehow using disk based tables when users logged in, thereby not using as much ram, hence page file space. The rollback driver is using memory based tables so is gobbling up as much ram, and paging file space as possible. Any thoughts would be appreciated. This is a group of 17 identical front end servers in a Citrix / terminal services environment.

Thank you,
Sep 11 '06 #1
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