Re: go for a script! / ex: PostgreSQL vs. MySQL

Nick,

> Sounds good to me. I will carry on working on it but I would definitely
> need some help, or at least a list of parameters to tweak, and some
> recomended values based on data about the puter in question.

> shared_buffers = 1/16th of total memory
> effective_cache_size = 80% of the supposed kernel cache.

But only if it's a dedicated DB machine. If it's not, all memory values
should be cut in half.

> I guess we also may be able to offer a simple and advanced mode. Simple
> mode would work on these recomended values, but kick it into advanced
> mode and the user can tweak things more finely. This would only be
> recomended for the Guru's out there of course. This may take a bit more
> time to do though.

What I would prefer would be an interactive script which would, by asking the
user simple questions and system scanning, collect all the information
necessary to set:

max_connections
shared_buffers
sort_mem
vacuum_mem
effective_cache_size
random_page_cost
max_fsm_pages
checkpoint_segments & checkpoint_timeout
tcp_ip

and on the OS, it should set:
shmmax & shmmall
and should offer to create a chron job which does appropriate frequency VACUUM
ANALYZE.

> As I said in the previous email I have only got access to Linux, so
> cross-platform help would be good too. I will try to make it as easy to
> do cross platform stuff as possible of course.

Let's get it working on Linux; then we can rely on the community to port it to
other platforms. I myself can work on the ports to Solaris and OS X.

--
Josh Berkus
Aglio Database Solutions
San Francisco