Tom Lane wrote:
> Huh, so on a percentage basis the Limit-node overhead is actually
> pretty significant, at least for a trivial seqscan plan like this
> case. (This is probably about the worst-case scenario, really,
> since it's tough to beat a simple seqscan for cost-per-emitted-
> row. Also I g
"Kevin Grittner" writes:
> Tom Lane wrote:
>> 1.35ms out of what?
> Without the limit node the runtimes (after "priming" the cache)
> were:
> 1.805, 2.533
> 1.805, 2.495
> 1.800, 2.446
> 1.818, 2.470
> 1.804, 2.502
> The first time for each run is "Total runtime" reported by EXPLAIN,
> the seco
Tom Lane wrote:
> "Kevin Grittner" writes:
>> I ran some quick tests on my i7 under Linux. Plan time was
>> increased by about 40 microseconds (based on EXPLAIN runtime)
>> and added a limit node to the plan. Execution time on a SELECT *
>> FROM tenk1 in the regression database went up by 1.35 ms
"Kevin Grittner" writes:
> Pavan Deolasee wrote:
>> I would tend to think that is the latter. While undoubtedly
>> limit/offset clause will add another node during query planning
>> and execution, AFAICS the OFFSET 0 and LIMIT ALL cases are
>> optimized to a good extent. So the overhead of having
Pavan Deolasee wrote:
> Amitabh Kant wrote:
>> Our scripts automatically add "LIMIT ALL" & "OFFSET 0" to every
>> select query if no values are passed on for these parameters. I
>> remember reading through the mailing list that it's better not
>> to pass them if they are not needed as they add a
On Thu, Dec 13, 2012 at 9:38 AM, Amitabh Kant wrote:
> Hi
>
> Our scripts automatically add "LIMIT ALL" & "OFFSET 0" to every select query
> if no values are passed on for these parameters. I remember reading through
> the mailing list that it's better not to pass them if they are not needed as
>
Hi
Our scripts automatically add "LIMIT ALL" & "OFFSET 0" to every select
query if no values are passed on for these parameters. I remember reading
through the mailing list that it's better not to pass them if they are not
needed as they add a cost to the query plan. Is this the case, or am i
loo
