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From James Smith <>
Subject Re: Ways to scale a mod_perl site
Date Thu, 17 Sep 2009 11:26:32 GMT
Igor Chudov wrote:
> Guys, I completely love this discussion about cookies. You have really
> enlightened me.
> I think that letting users store cookie info in a manner that is secure
> (involves both encryption and some form of authentication), instead of
> storing them in a table, could possibly result in a very substantial
> reduction of database use.
Alternatively store the information in a two level cache! 
memcached/database - with
write through - then most of the time you get the data from memcached - 
you can do
the same with the images...

write entry: -> write data to memcached ; write data to sql cache

read entry: -> read data from memcached and return OR
                       read data from sql cache and write to memcached 
and return

Should avoid most database reads! works well for the images you create 
to minimize
database accesses
> The cookie is
> 1) Encrypted string that I want and
> 2) MD5 of that string with a secret code appended that the users do not
> know, which serves as a form of signing
> That should work. I will not change it now, but will do if I get 2x more
> traffic.
> That way I would need zero hits to the database to handle my users sessions.
> (I only retrieve account information when necessary)
> As far as I remember now, I do not store much more information in a session
> beyond username. (I hope that I am not wrong). So it should be easy.
> Even now, I make sure that I reset the cookie table only every several
> months. This way I would let users stay logged on forever.
> Thanks a lot.
> Igor

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