bricklen <brick...@gmail.com> writes:
> On Fri, Nov 24, 2017 at 6:54 AM, hmidi slim <hmidi.sl...@gmail.com> wrote:
>> I'm trying to analyze some queries using the explain instructions and the
>> option analyze and buffers. I realized that the query refers to the cache
>> memory to return the results. Is there any solution to clear the cache in
>> postgresql inorder to get execution time of the query when it get data from
>> disk and not from cache memory?
> If you are on a (non-production) *nix server you can use:
> sync && echo 3 > /proc/sys/vm/drop_caches
You would also need to restart the postmaster, to get rid of whatever
is in Postgres' shared buffers.
regards, tom lane
