mos, Friday, August 30, 2002, 7:04:25 PM, you wrote: m> At 07:58 AM 8/30/2002, you wrote: >>mos, >>Thursday, August 29, 2002, 5:45:05 PM, you wrote: >> >> >>Start by looking at the MySQL documentation: >> >>http://www.mysql.com/doc/en/Query_Cache.html >> >>Read the entire 6.9 section. >> >> >> >>It offers quite a bit of information on how the cache operates, how >> >>you should configure it and so on. >> >>m> I read it too but I have a question about the cache, this sentence >>m> in particular. >> >>m> NOTE: The query cache does not return stale data. When data is modified, >>m> any relevant entries in the query cache are flushed. >> >>m> If I have a select statement like: >> >>m> select col1, col2 from table1 where col1='A' >> >>[skip] >> >>m> c) Or will any update to the table automatically flush the cache?
m> Victoria, >>Yes, relevant entries in the query cache are flushed when any changes were >>made on the >>table. m> Can you define "relevant"? Do you mean all caches for that table? m> Are you saying any change at all to the table, say I add a row, delete a m> row, or modify a row even if it is not in the scope of the cached query, m> will cause all caches for that table to be discarded? Argghhh! :-O Yes. And it's described in the manual: http://www.mysql.com/doc/en/Query_Cache_How.html m> Example: m> select customer_name from customers where state = 'NY' //<-Adds query to cache m> insert into customers (customer_name, state) values('jones', m> 'CA') //<-Flushes the cache for customers table? m> select customer_name from customers where state = 'NY' //<-No longer in cache? m> If you are correct, then I feel caching is useful primarily for readonly m> access to a table. As soon as a row is modified in any way, the caches for m> that table are flushed. Would you agree? Yes. -- For technical support contracts, goto https://order.mysql.com/?ref=ensita This email is sponsored by Ensita.net http://www.ensita.net/ __ ___ ___ ____ __ / |/ /_ __/ __/ __ \/ / Victoria Reznichenko / /|_/ / // /\ \/ /_/ / /__ [EMAIL PROTECTED] /_/ /_/\_, /___/\___\_\___/ MySQL AB / Ensita.net <___/ www.mysql.com --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php