Re: How to keep a table in memory?

adrobj wrote:
> I have a pretty small table (~20MB) that is accessed very frequently and
> randomly, so I want to make sure it's 100% in memory all the time. There is
> a lot of other staff that's also gets accessed frequently, so I don't want
> to just hope that Linux file cache would do the right thing for me.
>
> Is there any way to do that?
>
> One idea I have in my head is to start a process that does mmap() and
> mlock() with the table file. Will it work? If so, are there any potential
> problems?

Just leave it to the cache management algorithms in Postgres and Linux.
If it really is frequently accessed, it should stay in Postgres shared
buffers.

You can use the pg_buffercache contrib module to see what's in cache.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com