On 12/11/2011 5:02 p.m., Simon Slavin wrote:
On 12 Nov 2011, at 3:43am, Josh Gibbs wrote:
We are struggling to find a way to rework this query in a way
that performs efficiently for large data sets.
It's all about the indexes.
The problem with this query seems to be related to the
Josh Gibbs jgi...@imailds.com wrote:
The timestamps are already integers. We stumbled across that CAST operation
optimization purely by accident. I don't remember what led to it, but
we found
that it gave a measurable performance boost casting the integer as an
integer.
This works by
Josh Gibbs jgi...@imailds.com wrote:
To reiterate from my original question, if we don't add the order by then
the results come back at a very acceptable speed. But of course we'd
then have to iterate through the results ourselves to siphon off the
top item set that we're after. I'd really
On 12 Nov 2011, at 2:37pm, Igor Tandetnik wrote:
ANALYZE
Yeah. Do an ANALYZE. Then test timing with and without the CAST. See if it
helps.
I don't understand why your query should be faster when you suppress a useful
index. Oh wait. Your entire WHERE clause is about the joined table.
On 13/11/2011 3:37 a.m., Igor Tandetnik wrote:
Josh Gibbsjgi...@imailds.com wrote:
The timestamps are already integers. We stumbled across that CAST operation
optimization purely by accident. I don't remember what led to it, but
we found
that it gave a measurable performance boost casting
On 13/11/2011 3:45 a.m., Igor Tandetnik wrote:
Josh Gibbsjgi...@imailds.com wrote:
To reiterate from my original question, if we don't add the order by then
the results come back at a very acceptable speed. But of course we'd
then have to iterate through the results ourselves to siphon off
Hi all,
We are struggling to find a way to rework this query in a way
that performs efficiently for large data sets.
The goal is to find the top x most active senders of e-mails
within a date range.
The killer of this query is the ORDER BY clause. Without it
the results are quick and snappy.
On 12 Nov 2011, at 3:43am, Josh Gibbs wrote:
We are struggling to find a way to rework this query in a way
that performs efficiently for large data sets.
It's all about the indexes.
The goal is to find the top x most active senders of e-mails
within a date range.
Do you frequently do
