Re: Selects are slow when blob field?
Hi,
If you are always retrieving the blob data, then it wouldn't matter. Obviously in order to retrieve the blob it is going to have to read disk to get it. However long it takes to read 8MB of data will always be a bottleneck in your query, even with totally proper indexing (which should still help some).
If you do a bit of math you can see that with 8MB*28rows=224MB of data is being read and returned by the query you mentioned. No matter how fast your disk/network is, it will take a bit of time to move all of that data. If this is an issue, perhaps you should think about redesigning your application to avoid this bottleneck.
Harrison Fisk, Trainer and Consultant
MySQL AB, www.mysql.com
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