On 10 Oct 2007, at 09:40, Olga Khenkin wrote:
When some popular object expires from memcached, all its customers
try to retrieve the object from database simultaneously, and the
database becomes overloaded.
If this object is requested about 100 times in a minute, and if the
process of receiving it from DB, processing and storing in cache
takes about a minute, then the database receives 100 identical
queries.
The cache evicts stuff on an LRU basis, so anything popular should
not be kicked out unless relatively speaking it's really not that
popular, in which case you don't have a problem!
If it's really that popular and it's so expensive to create, then you
should replace it before it expires.
Marcus
--
Marcus Bointon
Synchromedia Limited: Creators of http://www.smartmessages.net/
UK resellers of [EMAIL PROTECTED] CRM solutions
[EMAIL PROTECTED] | http://www.synchromedia.co.uk/
