Hi Rick,
I thought you have to dedicate 70-80% of available RAM not a total RAM.
Saying if I have 2 gig of RAM on my exclusively innodb box, and I
dedicate 1.4Gig to innodb pool, my 64-bit linux machine will start
swapping heavily.
If I set it to 800-900M, it just fine and I have like 100M of RAM left
for some occasional process. I did try it.
Thanks,
Igor
On 16/04/13 16:21, Rick James wrote:
Run your query twice; take the second time. For most queries the first run
brings everything into cache, then the second gives you a repeatable, though
cached, timing.
Please provide EXPLAIN SELECT, SHOW CREATE TABLE, and we will critique your
indexes and query plan.
Handler* is another way to get consistent values. These numbers are unaffected
by caching.
1GB buffer_pool? You have only 2GB of available RAM? Normally, if you are
running only InnoDB, the buffer_pool should be set to about 70% of available
RAM.
-----Original Message-----
From: Ananda Kumar [mailto:anan...@gmail.com]
Sent: Tuesday, April 16, 2013 2:06 AM
To: Ilya Kazakevich
Cc: MySQL
Subject: Re: Mesaure query speed and InnoDB pool
Does your query use proper indexes.
Does your query scan less number blocks/rows can you share the explain
plan of the sql
On Tue, Apr 16, 2013 at 2:23 PM, Ilya Kazakevich <
ilya.kazakev...@jetbrains.com> wrote:
Hello,
I have 12Gb DB and 1Gb InnoDB pool. My query takes 50 seconds when it
reads data from disk and about 2 seconds when data already exists in
pool. And it may take 10 seconds when _some_ pages are on disk and
some are in pool.
So, what is the best way to test query performance? I have several
ideas:
* Count 'Innodb_rows_read' or 'Innodb_pages_read' instead of actual
time
* Set pool as small as possible to reduce its effect on query speed
* Set pool larger than my db and run query to load all data into pool
and measure speed then
How do you measure your queries' speed?
Ilya Kazakevich
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