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Re: RAM requirements- new server
Posted by: Rick James
Date: April 02, 2009 01:17AM

13/18 -- fine.
Other ram things -- not much.

40GB table -- if randomly accessed, you will be effectively I/O bound in spite of your big RAM.

file-per-table -- desirable.

innodb_flush_method = O_DIRECT -- desirable, especially if you have good buffering in the Disk controller.

innodb_flush_log_at_trx_commit -- this can make the biggest diff in performance.
More info: http://forums.mysql.com/read.php?24,213851,214241

Check the details of your RAID.
* Controller or software? (hdw is better)
* Onboard write cache? (very desirable)
* Write caching on drives, themselves? (probably should turn off)

For many queries, RAID-5 is as fast as RAID-10.

Your overnight stuff could probably be turned into summary tables that can be maintained "up to the minute" without noticeable performance hit. But that is another discussion.

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