On Tue, 2002-01-15 at 06:27, Culley Harrelson wrote:
> DBBalancer looks interesting. Looks like you are part of the development
> team with this project?
I am packaging it for Debian, and I am using it. All the C++ coding is
being done by Daniel Varela.
> What sort of performance difference to you see?
For most things the performance is roughly equivalent to using
persistent connections. If your resultsets are very large you will see
a performance impact because of the extra layer.
When I first started using it I benchmarked one of the applications I
use and decided it was around 5-10% faster than persistent connections,
but that was with small recordsets.
The main performance advantage for me is that I can have fewer database
connections than apache processes. Each page served on my sites usually
has a mix of database content and static (image) content, and apache
doesn't need to have a database operating for the static stuff, so I
only need around 30% database clients vs apache clients. Persistent
connections would have a 1 for 1 match, after they have been running for
a while. This means less memory pressure on the system, which is the
big win for me.
> When I made the decision to go with php/postgres as my primary
> development technologies I never even started using persistant
> connections because of all the mixed reviews. The database is local
> to the web server and performance is fine. I would be interested in
> hearing more about this connection pooling though...
There are some things you have to watch out for:
- use of temp tables
- transactions that you forgot to commit / rollback
That's the price you pay :-)
The biggest advantage of DBBalancer is probably that it doesn't require
you to make any changes to your PHP, other than in the pg_connect
statement - it's just as if you were connecting to a different database
server, because it supports the PostgreSQL interface natively. Other
connection pooling approaches may want you to load a different module
into PHP, or use a different set of PHP functions. This means that the
layer is very thin, as well.
Cheers,
Andrew.
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