At 12:53 -0700 5/16/03, Jeremy Zawodny wrote:
>On Fri, May 16, 2003 at 03:43:09PM -0400, Vincent Ferretti wrote:
>> I have created two identical tables (same structure, same content) but one
>> is an innodb table and the other is myIsam.
>> CREATE TABLE my_table (
>> id INT(10) UNSIGNED NOT NULL,
>> chromatogramID INT(10) UNSIGNED,
>> sequence TEXT,
>> seqQuality TEXT,
>> UNIQUE (chromatogramID),
>> PRIMARY KEY (id)
>> I've put with LOAD DATA 388896 records for a total of 1.3 GIG
>> The same query
>> SELECT COUNT(id) from my_table
>> takes 0.17 for the myIsam and 1min 40 sec for the innnodb version. Worst,
>> when I query again, it could take up to 6 min to give the same result with
>Have you seen the part of the InnoDB manual that describes why COUNT()
>queries are slow?
I don't understand why that applies, if I'm looking at the same section.
It pertains to COUNT(*), but the question above is for COUNT(col_name).
Vincent, are you actually issuing the query shown above, or are you really
>Jeremy D. Zawodny | Perl, Web, MySQL, Linux Magazine, Yahoo!
><Jeremy@stripped> | http://jeremy.zawodny.com/
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