On Thu, Aug 11, 2016 at 8:45 AM, Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > Jim Nasby <Jim.Nasby@xxxxxxxxxxxxxx> writes: >> I never dug into why. As Tom posited, decompression might explain the >> time to get a single key out. Getting 10 keys instead of just 1 wasn't >> 10x more expensive, but it was significantly more expensive than just >> getting a single key. > > What were you doing to "get ten keys out"? If those were ten separate > JSON operators, they'd likely have done ten separate decompressions. > You'd have saved something by having the TOAST data already fetched into > shared buffers, but it'd still hardly be free. Huh -- FWICT there is no way to pull N values from a jsonb with # of items M for any value of N other than 1 or M with a single operation. merlin -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
