Hi joerg,
that was a excellent explanation.
Regards,
Pradeep Chandru.
Joerg Bruehe wrote:
Hi !
Parikh, Dilip Kumar schrieb:
Hi ,
So you are trying to say that 1) when the Table has Low Cardinality, Mysql wont
use Index? Is this the logic behind your words?
Extreme example:
If
Hi !
Parikh, Dilip Kumar schrieb:
>
> Hi ,
>
> So you are trying to say that 1) when the Table has Low Cardinality, Mysql
> wont use Index? Is this the logic behind your words?
Extreme example:
If you are manually looking up one entry from a list of five (say, in a
cookbook), would you go th
, 2008 11:36 AM
To: Johan Thorvaldsson
Cc: mysql@lists.mysql.com <mailto:mysql@lists.mysql.com>
Subject: Re: Fwd: Why dont my query use the index keys?
Hi Johan,
the query is going for a temporary table creation "Using temporary;
Using filesort"
In case your s
force the query to use the index.
>
> *Thanks & Regards,*
> *Dilipkumar*
>
>
> *From:* chandru [mailto:[EMAIL PROTECTED]
> *Sent:* Thursday, September 18, 2008 12:23 PM
> *To:* Parikh, Dilip Kumar
> *Cc:* Johan Thorvaldsson; mysql@lists.mysql.com
> *S
lso looks like ok seems let me check, Please try
>>> to send the output of global status.
>>>
>>>Show global status;
>>>
>>>
>>>
>>> Thanks & Regards,
>>>Dilipkumar
>>>
>>>-Original Me
PROTECTED]
*Sent:* Thursday, September 18, 2008 12:23 PM
*To:* Parikh, Dilip Kumar
*Cc:* Johan Thorvaldsson; mysql@lists.mysql.com
*Subject:* Re: Fwd: Why dont my query use the index keys?
Hi Dilip,
I dont think forcing MySQL to use Index can improve your
performance. MySQL
gards,
Dilipkumar
-Original Message-
From: chandru [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 18, 2008 11:36 AM
To: Johan Thorvaldsson
Cc: mysql@lists.mysql.com <mailto:mysql@lists.mysql.com>
Subject: Re: Fwd: Why dont my query use the index keys?
H
, Please try to send
> the output of global status.
>
> Show global status;
>
>
>
> Thanks & Regards,
> Dilipkumar
>
> -Original Message-
> From: chandru [mailto:[EMAIL PROTECTED] <[EMAIL PROTECTED]>]
> Sent: Thursday, September 18, 2008 11:3
, Please try to send
> the output of global status.
>
> Show global status;
>
>
>
> Thanks & Regards,
> Dilipkumar
>
> -Original Message-
> From: chandru [mailto:[EMAIL PROTECTED] <[EMAIL PROTECTED]>]
> Sent: Thursday, September 18, 2008 11:3
m: chandru [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 18, 2008 12:23 PM
To: Parikh, Dilip Kumar
Cc: Johan Thorvaldsson; mysql@lists.mysql.com
Subject: Re: Fwd: Why dont my query use the index keys?
Hi Dilip,
I dont think for
global status;
Thanks & Regards,
Dilipkumar
-Original Message-
From: chandru [mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 18, 2008 11:36 AM
To: Johan Thorvaldsson
Cc: mysql@lists.mysql.com
Subject: Re: Fwd: Why dont my query use the index keys?
Hi Johan,
the query is going
aldsson
Cc: mysql@lists.mysql.com
Subject: RE: Fwd: Why dont my query use the index keys?
Hi johan,
U can use and try to write a query to use index in it (like use index(index
name) before where condition.
And other variables also looks like ok seems let me check, Please try to send
the output of
inal Message-
From: chandru [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 18, 2008 11:36 AM
To: Johan Thorvaldsson
Cc: mysql@lists.mysql.com
Subject: Re: Fwd: Why dont my query use the index keys?
Hi Johan,
the query is going for a temporary table creation "Using temporary; Using
Hi johan,
you have allocated 4M for your sort buffer size is ok. So i feel that
the query is loading more than 4MB of data so it is creating a temporary
file to do a sorting. please try to put some logic into the query that
you use to load the appropriate data. I find that the tag_id has a
car
mysql> show global variables like 'sort%';
+--+-+
| Variable_name| Value |
+--+-+
| sort_buffer_size | 4194296 |
+--+-+
1 row in set (0.01 sec)
18 sep 2008 kl. 08.05 skrev chandru:
Hi Johan,
the query is going for a t
D]>
Datum: ti 16 sep 2008 13.19.43 GMT+02:00
Till: "Johan Thorvaldsson" <[EMAIL PROTECTED]>
Kopia: mysql@lists.mysql.com
Ämne: Re: Why dont my query use the index keys?
Hi Johan,
Its doing a range based search, so its using index.
regards
anandkl
On 9/16/08, Johan Thorvaldss
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