[389-users] Re: LDBM recommended Setting

On 08/14/2018 11:32 AM, Paul Whitney wrote:

Hi guys,

Am looking to improve performance in my 389 DS deployment.  In reviewing the documentation, the recommended size for the LDBM cache is the sum of the backend database + 15% of the backend database.  For me that comes out to almost 27GB.  Seems high considering the database cache is set very high as well. Is that a recommended setting or is there a better practice?

Well the more of the database you can keep in the cache the better the performance.   However, you are talking about the same cache: LDBM cache is the same thing as the database cache.

But you should also include the entry cache for your database.  So you almost want to double that to 50GB total ;-)    27 GB for DB cache, and 20 GB for entry cache (this varies of course for the entry cache and it will probably be less than 20GB, but you won't know until you start priming the entry cache and checking the database monitor - trying to achieve 99% cache hit ratio).

Mark

Thanks,

 

Paul M. Whitney

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