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Re: MySql select * performance
Posted by: James Day
Date: December 20, 2004 04:40PM

You might consider increasing read_buffer_size. A few megabytes (8 perhaps) may make a significant difference if you currently have it set very low and this is a common operation for you. You can do this for just this query instead of changing the global setting, by typing or sending "set read_buffer_size=8*1024*1024;".

If it's not common you might get better results overall by adjusting the key_buffer_size value if you're using the MyISAM engine, since that can increase or decrease the amount of RAM allocated for caching of the indexes. You can still adjust read_buffer_size for a single connection when you're doing a bulk read.

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