On 26.01.2011 16:46, Felix Schmidt @ Oracle wrote:
Everybody,
I'm interested in the query optimizer of PostgreSQL DB. Where could I
find useful documentation or could you send me a pointer in the source code?
The relevant source code is in src/backend/optimizer directory. If you
google around, you'll find introductory presentations, but I can't
recommend any particular one.
What kind of parallelism does PostgreSQL use for operators, like
selection or join?
The short answer is "none". Each PostgreSQL backend is a one
single-threaded process, one query will only utilize one CPU
(http://wiki.postgresql.org/wiki/FAQ#How_does_PostgreSQL_use_CPU_resources.3F).
If you search the archives, you'll find discussion on how it might one
day be improved, but nothing concrete has been done.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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