Re: PostgreSQL versus MySQL for GPS Data

Juan Pereira wrote:
> Craig Ringer wrote:
>
>
> >> You're almost always better off using a single table with a composite
> >> primary key like (truckid, datapointid) or whatever. If you'll be doing
> >> lots of queries that focus on individual vehicles and expect performance
> >> issues then you could partition the table by truckid, so you actually do
> >> land up with one table per truck, but transparently accessible via table
> >> inheritance so you can still query them all together.
>
> Quite interesting!
>
> The main reason why we thought using a table per truck was because
> concurrent load: if there are 100 trucks trying to write in the same table,
> maybe the performance is worse than having 100 tables, due to the fact that
> the table is blocked for other queries while the writing process is running,
> isn't it?

Wow, you are carrying around a lot of MySQL baggage with you. ;-)

You should probably read this:

http://www.postgresql.org/docs/8.3/static/mvcc-intro.html

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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