db_block_lru_latches and servers with multiple instances

From: <rgaffuri_at_cox.net>
Date: Mon, 20 Oct 2003 06:39:27 -0800
Message-ID: <F001.005D3BFC.20031020063927@fatcity.com>

We have some servers with 6-8 instances. These are typically staging instances and maybe 1 low transaction production instance.

We keep multiple instances on one server strictly for cost. Licensing additional servers would be prohibitively expensive so we bought higher end servers and stacked them with multiple instances.

My concern here is with latch contention. I have read that its often best to have db_block_lru_latches set to 2 *CPU. We have 4 CPUs on each server and are an NAS hard disk array from network appliances.

Do I have to take into consideration the additional instances on the server when considering latch contention?

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Author: <rgaffuri_at_cox.net
  INET: rgaffuri_at_cox.net

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