On 01/06/2011, at 11:45 AM, Jarrod Chesney wrote:
> I'm executing 30,000 single delete statements in one transaction.
>
> At this point i'm looking into combining the multiple deletes into one
> statement and breaking my big transaction into smaller ones of about 100
> deletes or so.
>
> On 0
On Wed, Jun 1, 2011 at 7:54 PM, Robert James wrote:
> Hi. I'm interested in understanding the differences between
> CLUSTERing a table and making a dedicated one.
>
> We have a table with about 1 million records. On a given day, only
> about 1% of them are of interest. That 1% changes every day
On Wed, Jun 1, 2011 at 6:28 PM, CS DBA wrote:
> On 06/01/2011 03:38 PM, Kevin Grittner wrote:
>>
>> CS DBA wrote:
>>
>>> The app wants to run a query like this:
>>>
>>> select count(pri_num) from max_xtrv_st_t
>>> where pri_num in (select max(pri_num) from max_xtrv_st_t where 1=1
>>>
> -Original Message-
> From: pgsql-performance-ow...@postgresql.org [mailto:pgsql-performance-
> ow...@postgresql.org] On Behalf Of Robert James
> Sent: Wednesday, June 01, 2011 5:55 PM
> To: pgsql-performance@postgresql.org
> Subject: [PERFORM] CLUSTER versus a dedicated table
>
> Hi.
A query I has spends a long time on Hash Joins (and Hash Left Joins).
I have a few questions:
1. When does Postgres decide to do a Hash Join, over another type of Join?
2. Do Hash Joins normally perform poorly? What can I do to speed them up?
3. What can I do to enable Postgres to use a faster ty
Hi. I'm interested in understanding the differences between
CLUSTERing a table and making a dedicated one.
We have a table with about 1 million records. On a given day, only
about 1% of them are of interest. That 1% changes every day (it's
WHERE active_date = today), and so we index and cluster
On 06/01/2011 03:15 PM, Merlin Moncure wrote:
On Wed, Jun 1, 2011 at 3:14 PM, CS DBA wrote:
Hi All;
We have a table with approx 200 columns. about a dozen columns are text data
types and the rest are a mix of integers , bigint's and double precision
types.
The table has about 25million rows.
On 06/01/2011 03:38 PM, Kevin Grittner wrote:
CS DBA wrote:
The app wants to run a query like this:
select count(pri_num) from max_xtrv_st_t
where pri_num in (select max(pri_num) from max_xtrv_st_t where 1=1
group by tds_cx_ind, cxs_ind_2)
Why not something
CS DBA wrote:
> The app wants to run a query like this:
>
> select count(pri_num) from max_xtrv_st_t
> where pri_num in (select max(pri_num) from max_xtrv_st_t where 1=1
> group by tds_cx_ind, cxs_ind_2)
Why not something simpler? There are a number of possibi
On Wed, Jun 1, 2011 at 3:14 PM, CS DBA wrote:
> Hi All;
>
> We have a table with approx 200 columns. about a dozen columns are text data
> types and the rest are a mix of integers , bigint's and double precision
> types.
>
> The table has about 25million rows.
>
>
> The app wants to run a query li
Hi All;
We have a table with approx 200 columns. about a dozen columns are text
data types and the rest are a mix of integers , bigint's and double
precision types.
The table has about 25million rows.
The app wants to run a query like this:
select count(pri_num) from max_xtrv_st_t
where pr
On Tue, 2011-05-31 at 10:20 +0300, Jenish wrote:
> Hi All,
>
> I have created partition on table Round_Action , which has 3 child
> partition tables.
>
>
> When I am firing a simple select query with limit on parent table it
> is taking huge time to execute. But when I am firing this query
> d
On Wed, Jun 1, 2011 at 4:19 AM, Reuven M. Lerner wrote:
> Hi, everyone.
>
> First of all, thanks for all of your help several days ago. The
> improvements to our program were rather dramatic (in a positive sense).
>
> Based on the help that everyone gave, I'm working on something similar,
> tryin
Hi, everyone.
First of all, thanks for all of your help several days ago. The
improvements to our program were rather dramatic (in a positive sense).
Based on the help that everyone gave, I'm working on something similar,
trying to use regexp_replace to transform a string into the result of
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