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Re: Slow query performance
Posted by: KimSeong Loh
Date: October 14, 2004 07:08PM

What table type/engine do you used for your BLOCKGROUP_DEMOGRAPHIC table?

If you have used MYISAM table type then you should get the result of count(*) instantly since the number of records is stored separately as the table status, no need to scan the records or index.

If you have used other engine type like INNODB, the number is not kept and it will have to scan and count the number of records.

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