On Thu, 19 Mar 2009, Oleg Bartunov wrote:
On Thu, 19 Mar 2009, Tom Lane wrote:
Oleg Bartunov writes:
We usually say about 200 unique values as a limit for
gist_int_ops.
That seems awfully small ... should we make gist_intbig_ops the default,
or more likely, raise the signature size of both
On Thu, 19 Mar 2009, Tom Lane wrote:
Oleg Bartunov writes:
We usually say about 200 unique values as a limit for
gist_int_ops.
That seems awfully small ... should we make gist_intbig_ops the default,
or more likely, raise the signature size of both opclasses? Even at a
crossover point of 10
Oleg Bartunov writes:
> We usually say about 200 unique values as a limit for
> gist_int_ops.
That seems awfully small ... should we make gist_intbig_ops the default,
or more likely, raise the signature size of both opclasses? Even at a
crossover point of 1 I'm not sure that many real-world
We usually say about 200 unique values as a limit for
gist_int_ops.
On Wed, 18 Mar 2009, Tom Lane wrote:
Ron Mayer writes:
Oleg Bartunov wrote:
OB:> it's not about short or long arrays, it's about small or big
OB:> cardinality of the whole set (the number of unique elements)
I'm re-reading
Ron Mayer writes:
> Oleg Bartunov wrote:
> OB:> it's not about short or long arrays, it's about small or big
> OB:> cardinality of the whole set (the number of unique elements)
> I'm re-reading the docs and still wasn't obvious to me. A
> potential docs patch is attached below.
Done, though no
Tom Lane wrote:
> Ron Mayer writes:
>> vm=# create index "gist7" on tmp_intarray_test using GIST (my_int_array
>> gist__int_ops);
>> CREATE INDEX
>> Time: 2069836.856 ms
>
>> Is that expected, or does it sound like a bug to take over
>> half an hour to index 7 rows of mostly 5 and 6-elem
Ron Mayer writes:
> vm=# create index "gist7" on tmp_intarray_test using GIST (my_int_array
> gist__int_ops);
> CREATE INDEX
> Time: 2069836.856 ms
> Is that expected, or does it sound like a bug to take over
> half an hour to index 7 rows of mostly 5 and 6-element
> integer arrays?
I p
Ron Mayer wrote:
> This table summarizes some of the times, shown more completely
> in a script below.
> =
> create gist index on 1 = 5 seconds
> create gist index on 2 = 32 seconds
> create gist index on 3 = 39
Short summary:
* extremely slow intarray indexes with gist__int_ops
* gist__intbig_ops seems much faster even with short arrays
* gin seems much much faster for inserts and creation(and queries)
I was debugging a system with a table that slowed to where individual
inserts were taking
