correctly set num_sql_sock in sql accoutnig (Erratum)

Alexandre Chapellon alexandre.chapellon at
Tue Sep 15 00:26:53 CEST 2009

Thanks Alan, I'm using postgresql

Le lundi 14 septembre 2009 à 23:15 +0100, Alan Buxey a écrit :

> Hi,
> > >   How long do database writes take?
> > 
> > insert in acccouting db takes ~ 10ms
> > delete from accouting db takes ~ 25ms
> > 
> > For the authtentication database I have about 10 authentication
> > queries/s but regularly reaches 30/s when problems on BAS or DSLAM
> > outcome (max value since last year is ~80/s). 
> from those details it looks like you could handle 100 inserts
> per seond with a single process and 40 deletes per second. 
> worse case you came up with was 80/s - which is fine for inserts
> but tricky for deletes - so you'd need just 2 sockets on a rainy day.
> - but then you've got things like table locking if using MySQL 
> with eg myISAM engine so you'd have to probably double that to deal
> with the slower queries - make it 4 sockets.
> I've only made FreeRADIUS cry with mySQL when hitting it with
> really big slow queries at which point it choked all its handles
> and started to get really angry but a couple of optimisations later
> with some indexes and a change of DB engine (InnoDB) and things
> were fine - to ensure future happiness a migration to postgres
> was undertaken (pretty painless on the FR side of things...updating
> other code was more ...interesting... lets say) and we then moved
> to buffered_sql for the heavy stuff - that thread chugs along in
> the background inserting/updating table values when it needs to.
> FreeRADIUS and accouting DB took up too much time a while back..
> a distraction that I could have done without but since the move to a 
> better DB (I know..i'm stirring now..) and moving to 'out of band'
> DB updates its 'just done its job(tm)'
> PS there is an upcoming webcast about FreeRADIUS and mysql clusters
> - if you are into MySQL and performance/reliability I'd wholely
> recommend getting onto that.
> alan
> -
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