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Re: MySQL Clustering
Posted by: Harrison Fisk
Date: October 13, 2004 11:22AM

Hi,

MySQL Cluster was originally designed to be a main memory database, meaning, as you have stated, that you need to have enough memory across the entire cluster to accomidate your data. Keep in mind that is the memory across the entire cluster setup.

So if you had 12 nodes that each had 8 GB of ram, then you would have 12*8=96 GB of ram total. Now depending on the number of replicas you tell it to keep (for HA purposes), then you will have less than this. The normal setting is to have 2 replicas, which would give you 96/2 = 48 GB of memory for data and indexes roughly. Keep in mind there is some overhead as well, but that is a rough number.

With all of that said, there have been some efforts to allow disk based data as well. I believe that blob and text fields are now stored on disk in the most recent versions. In a future version, (most likely MySQL 5.0), there should be the option to store the entire table data on disk as well.

Regards,

Harrison

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