On 9/7/06, [EMAIL PROTECTED] wrote:
I need to know the number of rows that a query will return before actually executing the query. So I am sending select count(*) before sending select *. Actually I need to reject queries if the number of records that it will return is huge, to avoid my server running out of memory. My application has a huge database of around 10 millions. The selects with INNODB falls drastically as the size of records grow. A select count(*) that takes 4 secs with 1 million records takes 40 secs with 3 million records.
Just read the fine manual, everything is explained there: http://dev.mysql.com/doc/refman/4.1/en/innodb-tuning.html If you want more information on the fundamentals behind multiversioning I would recommend reading chapter 5 of "Concurrency Control and Recovery in Database Systems" http://research.microsoft.com/pubs/ccontrol/ If you want more information about the InnoDB specific implementation details there is always the source. Jochem -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
