Hi Jim,
On Tue, Dec 30, 2008 at 5:54 PM, Jim Lyons jlyons4...@gmail.com wrote:
On Sat, Dec 27, 2008 at 12:38 PM, Jake Maul jakem...@gmail.com wrote:
3) Obviously it'd probably be faster if you weren't using
SQL_NO_CACHE... guessing you just did that to show us what it's like
that way?
Hi
I am trying to get to grips with understanding mysql performance.
I have the following query:
select sql_no_cache count(*), date_format(calldate, '%y-%m-%d') as m
from cdr_warehouse group by m;
This gives me:
115 rows in set (59.52 sec)
mysql explain select count(*),
if you weren't using
SQL_NO_CACHE... guessing you just did that to show us what it's like
that way?
4) I'd check the values of sort_buffer_size and read_rnd_buffer_size.
Perhaps you could benefit from raising them slightly.
As for general performance tips, Here's a couple scripts I like to use
In the last episode (Dec 27), Chris Picton said:
I am trying to get to grips with understanding mysql performance.
I have the following query:
select sql_no_cache count(*), date_format(calldate, '%y-%m-%d') as m from
cdr_warehouse group by m;
This gives me:
115 rows in set (59.52 sec)
Hi,
On Sat, Dec 27, 2008 at 6:15 PM, Chris Picton ch...@ecntelecoms.com wrote:
Hi
I am trying to get to grips with understanding mysql performance.
I have the following query:
select sql_no_cache count(*), date_format(calldate, '%y-%m-%d') as m from
cdr_warehouse group by m;
This gives
Mmm I just tested this and it does indeed work (although i tested with
slightly less rows :o) )
explain select count(*) , date_format(calldate, '%y-%m-%d') as m from
cdr_warehouse group by m \G
*** 1. row ***
id: 1
select_type: SIMPLE
