Alexander Steffens writes:
> I assume there is now a hashed ANTI-SEMI-JOIN operator implemented?
What does EXPLAIN say about it?
regards, tom lane
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Congratulations PostgreSQL-Team for your work!
with the current 8.4 B1 Version of PostgreSQL the bad execution time
of my example-Query containing a NOT EXISTS
changed from "aborted after hours" to just 5 seconds - double as quick
as my result with MS-SQL.
That's wonderful!
> insert into t1
> se
So sorry, I send you only the half of information:
MS-SQL uses the the plan with only nested loops when i have abt less
than 100 tuples in both the tables (="small")
when t1 gets abt > 1000 tuples (="medium") it switches to the
hash-anti-semi-join, when both tables gets more than 1000 tuples
(="bi
Gregory Stark <[EMAIL PROTECTED]> writes:
> "Tom Lane" <[EMAIL PROTECTED]> writes:
>> It's possible that MS-SQL is doing something analogous to the
>> hashed-subplan approach (hopefully with suitable tweaking for the NULL
>> case) but even then it's hard to see how it could take only 9 sec.
>> The
"Tom Lane" <[EMAIL PROTECTED]> writes:
> It's possible that MS-SQL is doing something analogous to the
> hashed-subplan approach (hopefully with suitable tweaking for the NULL
> case) but even then it's hard to see how it could take only 9 sec.
> The cartesian product is too big.
Fwiw it seems MS
Gregory Stark <[EMAIL PROTECTED]> writes:
>> insert into t1
>> select distinct (t1.a + t2.a)*2
>> from t1,t2
>> where not exists (
>> select * from t1 tt where tt.a = (t1.a + t2.a)*2
>> )
> What plan does MS-SQL use to complete this? I wonder whether it's producing
> the same answer Postgres is.
"Alexander Steffens" <[EMAIL PROTECTED]> writes:
> Hello, I have found an Query (with data)
> that need to execute on MS-SQL 2005 < 9sec,
> on Postgresql I will stop it now after more than 30 mins:
> insert into t1
> select distinct (t1.a + t2.a)*2
> from t1,t2
> where not exists (
> select * fr
The following bug has been logged online:
Bug reference: 3826
Logged by: Alexander Steffens
Email address: [EMAIL PROTECTED]
PostgreSQL version: 8.3b4
Operating system: Win2003R2x64
Description:Very Slow Execution of examplequery (wrong plan?)
Details:
Hello, I have
