Subject Re: [firebird-support] index vs page size
Author Nick Upson
Post date 2019-06-21T11:39:46Z
Thank you


Kind Regards,
Nick

Nick Upson | Principal Operations Engineer
office +44 01799 588800 support hotline +44 1799 399200
DDI +44 01799 588621

telensa.com | @telensa | Linkedin


From: firebird-support@yahoogroups.com <firebird-support@yahoogroups.com> on behalf of Ann Harrison aharrison@... [firebird-support] <firebird-support@yahoogroups.com>
Sent: 21 June 2019 12:31
To: firebird-support@yahoogroups.com
Subject: Re: [firebird-support] index vs page size
 
 



On Jun 20, 2019, at 11:10 AM, Nick Upson nu@... [firebird-support] <firebird-support@yahoogroups.com> wrote:

Hi

I have a large 100Gb+ firebird 2.5 database and I'm trying to deal with some performance issues.

One indicator I have found is that several large tables have indexes with a depth of 3 (and one of 4). The guidance I have seen says to increase the page size until the depth is below 3 but the pagesize is already maxed out at 16k. Can anyone suggest other actions I could take.

The guidance should have been three or less, not less than three.  One index with four levels should not be a crisis if you have adequate page cache. 

Good luck,

Ann



Kind Regards,
Nick

Nick Upson | Principal Operations Engineer
office +44 01799 588800 support hotline +44 1799 399200
DDI +44 01799 588621

telensa.com | @telensa | Linkedin


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