If its the OS cache the kernel ought to free the memory when there is something else worth caching. Its not a big deal if the cache is full so long as the system still performs well.
On Tue, Sep 30, 2008 at 9:51 AM, Denis Gasparin <denis@edistar.com> wrote:
Tom Lane ha scritto:
> Denis Gasparin <denis@edistar.com> writes: > >> I'm evaluating to issue the drop_caches kernel command (echo 3 > >> /proc/sys/vm/drop_caches) in order to free unused pagecache, directory >> entries and inodes. >> > > Why in the world would you think that's a good idea? > > regards, tom lane > >
We see cached memory growing on constant base, even if there are no connections to database.
We have some tables that are truncated and reloaded with updated data on regular basis (3,4 days).
It seems like postgres or the operating system (linux) is keeping in cache that old data even if it has been deleted.
We're searching a way to free that memory without shutting down pgsql.
