Re: Raw devices and MySQL

2005-10-14 Thread Alec . Cawley
Logan, David (SST - Adelaide) [EMAIL PROTECTED] wrote on 14/10/2005 
03:28:15:

 Hi Listers,
 
 Does anybody know if the MyISAM engine (apart from InnoDB) allows the
 use of raw disk space rather than having cooked files? If not, is this
 feature likely to be included in a future release? I had a quick scour
 of the MySQL website but can't seem to find a page with upcoming
 features. Is there such a beast?

Given the way MyISAM works, I would have thought it very unlikely that 
this would ever happen. It would mean the SQL team developing their own 
special-purpose file system. Why bother, when they already have such a 
file system, called InnoDB? It is difficult to see what gain there would 
be for investing a very large amount of effort which could probably better 
spent elsewhere. As I understand it, the gains of using raw devices with 
InnoDB are, while not zero, small. 

Why do you want such a feature?

Alec



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RE: Raw devices and MySQL

2005-10-14 Thread Logan, David (SST - Adelaide)
Hi Alec,

Thanks for the response. You are probably quite right about the gains,
mostly my query was through curiosity more than anything. I use raw
devices with Informix and a couple of other databases and there are
small improvements to be seen on these products. On very large scale
implementations, the small things can often translate into user
satisfaction and that is a big part of my job 8-)

Unfortunately I don't always get any say on the how and why of the
clients application design and so have to make the best of what I have
been given to manage. Often we are presented with the hardware as a
fait accompli so if we can get an improvement, no matter how small,
they tend to become important.

Regards

David Logan
Database Administrator
HP Managed Services
148 Frome Street,
Adelaide 5000
Australia

+61 8 8408 4273 - Work
+61 417 268 665 - Mobile
+61 8 8408 4259 - Fax


-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 
Sent: Friday, 14 October 2005 6:53 PM
To: Logan, David (SST - Adelaide)
Cc: MySQL List
Subject: Re: Raw devices and MySQL

Logan, David (SST - Adelaide) [EMAIL PROTECTED] wrote on 14/10/2005

03:28:15:

 Hi Listers,
 
 Does anybody know if the MyISAM engine (apart from InnoDB) allows the
 use of raw disk space rather than having cooked files? If not, is this
 feature likely to be included in a future release? I had a quick scour
 of the MySQL website but can't seem to find a page with upcoming
 features. Is there such a beast?

Given the way MyISAM works, I would have thought it very unlikely that 
this would ever happen. It would mean the SQL team developing their own 
special-purpose file system. Why bother, when they already have such a 
file system, called InnoDB? It is difficult to see what gain there would

be for investing a very large amount of effort which could probably
better 
spent elsewhere. As I understand it, the gains of using raw devices with

InnoDB are, while not zero, small. 

Why do you want such a feature?

Alec



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MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]


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Re: Raw Devices in MySQL?

2002-02-21 Thread Jeremy Zawodny

On Thu, Feb 21, 2002 at 04:10:58PM -0500, Lou Picciano / Essex Systems wrote:
 Have a feeling I know the answer already, but ­ here goes! ...
 
 Does anyone know if (and how) MySQL supports raw devices?  I¹ve been
 searching the docs; can find nothing...

InnoDB can use raw devices.
-- 
Jeremy D. Zawodny, [EMAIL PROTECTED]
Technical Yahoo - Yahoo Finance
Desk: (408) 349-7878   Fax: (408) 349-5454   Cell: (408) 685-5936

MySQL 3.23.47-max: up 14 days, processed 460,706,325 queries (371/sec. avg)

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