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?
Victoria,
>Yes, relevant entries in the query cache are flushed when any changes were
>made on the
>table.
Can you define "relevant"? Do you mean all caches for that table?
Are you saying any change at all to the table, say I add a row, delete a
row, or modify a row even if it is not in the scope of the cached query,
will cause all caches for that table to be discarded? Argghhh! :-O
Example:
select customer_name from customers where state = 'NY' //<-Adds query to cache
insert into customers (customer_name, state) values('jones',
'CA') //<-Flushes the cache for customers table?
select customer_name from customers where state = 'NY' //<-No longer in cache?
If you are correct, then I feel caching is useful primarily for readonly
access to a table. As soon as a row is modified in any way, the caches for
that table are flushed. Would you agree?
Mike
---------------------------------------------------------------------
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
