The data size is about 200 GB. I would have noticed increase on writes. No
backup activity is running (actually I don't do conventional backups).
Any theories?
Thank you for your interest.
Kind regards,
--
Luis Motta Campos
On 23 Oct 2011, at 14:06, Tyler Poland tpol...@engineyard.com wrote:
Claudio,
Thank you for your interest.
I will wait for the issue to happen again and will see what kind of information
I can get back with strace. This is indeed something I didn't think of trying
yet.
I'll keep you people posted on this.
Much appreciated on the new approaches and fresh
Thank you for sharing your experience, Howard.
As those are replica servers, I don't care much about losing a second worth of
data in case of power failure. I believe the data centre has double independent
power sources, and my hardware man assured me if the power goes down at the
data centre
I have a very large table - approx 3 or 4 gig in size.
When i initiate a process on my webpage - mysql starts to create a
temporary table in /tmp directory.
Is there a way i can create this file/table ahead of time so mysql
does not have to create it ?
thanks
mjh
--
MySQL General Mailing List
On Mon, Oct 24, 2011 at 10:52 AM, Joey L mjh2...@gmail.com wrote:
I have a very large table - approx 3 or 4 gig in size.
When i initiate a process on my webpage - mysql starts to create a
temporary table in /tmp directory.
Is there a way i can create this file/table ahead of time so mysql
Something you're doing is creating a very large temporary table as
part of handling it's query. Usual culprit would be something doing a
full table join combined with an order by or group by which would
typically cause MySQL to need to create a temp table.
You should do EXPLAINs on your
select id from table order by rand() limit 1;
is doing as example a dumb temporary table with the full size
Am 24.10.2011 17:03, schrieb Joey L:
On Mon, Oct 24, 2011 at 10:52 AM, Joey L mjh2...@gmail.com wrote:
I have a very large table - approx 3 or 4 gig in size.
When i initiate a process
At 10:34 AM 10/24/2011, you wrote:
select id from table order by rand() limit 1;
is doing as example a dumb temporary table with the full size
Because it has to sort the entire table, then it
returns the one row. This of course is extremely inefficient. :)
You need to choose a random row by
You should do EXPLAINs on your slow-running queries to find out which ones
are likely... If it is generating a 30gig file, I'd expect it must be a very
slow query.
I know why the files are being created - but is there anything i can
do on the server to accomodate for large file operations ?
MySQLTuner 1.2.0 - Major Hayden ma...@mhtx.net
Bug reports, feature requests, and downloads at http://mysqltuner.com/
Run with '--help' for additional options and output filtering
Please enter your MySQL administrative login: root
Please enter your MySQL administrative password:
Am 24.10.2011 18:02, schrieb mos:
At 10:34 AM 10/24/2011, you wrote:
select id from table order by rand() limit 1;
is doing as example a dumb temporary table with the full size
Because it has to sort the entire table, then it returns the one row. This of
course is extremely inefficient.
Am 24.10.2011 18:27, schrieb Joey L:
Performance Metrics -
[--] Up for: 10s (2K q [237.300 qps], 591 conn, TX: 947K, RX: 261K)
[!!] Key buffer size / total MyISAM indexes: 2.0G/12.0G
[!!] Key buffer hit rate: 89.9% (5K cached / 524
Dear all,
Benetl, a free ETL tool for MySQL, is out in version 3.8.
It is now supporting official MySQL (5.x) driver(s), not provided.
Benetl is freely dowloadable at: http://www.benetl.net
Please read documentation to see how to use the official MySQL driver
instead of the provided driver.
- Original Message -
From: Joey L mjh2...@gmail.com
I know why the files are being created - but is there anything i can
do on the server to accomodate for large file operations ?
*We* don't, however :-) If you'd care to enlighten us as to the particular job
and why [you believe
I know this is a common problem, and I've been struggling with it for a full
day now but I can't get it.
I also tried a few sites for examples:
http://www.artfulsoftware.com/infotree/queries.php#101
http://forums.devarticles.com/general-sql-development-47/select-max-datetime
-problem-10210.html
At 11:32 AM 10/24/2011, Reindl Harald wrote:
Am 24.10.2011 18:02, schrieb mos:
At 10:34 AM 10/24/2011, you wrote:
select id from table order by rand() limit 1;
is doing as example a dumb temporary table with the full size
Because it has to sort the entire table, then it returns the one
Am 24.10.2011 23:31, schrieb mos:
At 11:32 AM 10/24/2011, Reindl Harald wrote:
Am 24.10.2011 18:02, schrieb mos:
At 10:34 AM 10/24/2011, you wrote:
select id from table order by rand() limit 1;
is doing as example a dumb temporary table with the full size
Because it has to sort
A kind (and shy) soul replied to me off list and suggested this solution,
however,
this takes 28 seconds (that's for a single customer_id, so this is not going
to scale).
Got any other suggestions? :-)
SELECT
c.customer_id,
c.email,
c.name,
c.username,
Okay, it seems I am learning... slowly...
So there needs to be a second WHERE in the sub-select...
To get ONE customer's last subscription (0.038s):
SELECT
c.customer_id,
c.email,
c.name,
c.username,
s.subscription_id,
s.`date`
FROM
At 05:31 PM 10/24/2011, Reindl Harald wrote:
Am 24.10.2011 23:31, schrieb mos:
At 11:32 AM 10/24/2011, Reindl Harald wrote:
Am 24.10.2011 18:02, schrieb mos:
At 10:34 AM 10/24/2011, you wrote:
select id from table order by rand() limit 1;
is doing as example a dumb temporary table
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