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Re: Can MySql database store images?

From Tim Watts <tw@dionic.net>
Newsgroups comp.databases.mysql
Subject Re: Can MySql database store images?
Followup-To comp.databases.mysql
Date 2011-04-25 13:59 +0100
Organization A noiseless patient Spider
Message-ID <8q7g88-dqd.ln1@squidward.dionic.net> (permalink)
References (7 earlier) <ip236r$v3q$1@dont-email.me> <kikf88-1rv.ln1@squidward.dionic.net> <ip3ijr$f0q$1@dont-email.me> <a31g88-6ii.ln1@squidward.dionic.net> <ip3m17$39q$1@news.albasani.net>

Followups directed to: comp.databases.mysql

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The Natural Philosopher wrote:

> Tim Watts wrote:
> 
>> I suggest you top talking now and "man rsync". It does sync filesystems.
>> It also has the option to backup (divert to another directory tree) any
>> file that it is about to delete or update on the target. There are your
>> incrementals. I've been running that method for 10 years - it works.
>> 
> 
> I can only talk from personal experience. I have been rsyncing an ISAM
> based mySQL system containing images over a very slow connection.
> 
> 
> I assumed at a first that if I added an image,, the whole table would be
> rsynced, but this is not the case.
> 
> It seems to be smart enough to send the changes only.
> 
> I also expected that simply copyingh  a live system would result in a
> pretty inconsistent database. It doesn't. I can dump the files into a
> mysql directory structure and recreate the original database with 100%
> accuracy.
> 
> This is NOT a highly trafficed site, so its obviously  a function of
> that, but it does suggest that rsync and mysql are better designed than
> certain people give them credit for.

So you're doing a hot copy type backup? That is valid provided you can lock 
the tables correctly. That's quite dependant on which engine is used in 
MySQL isn't it? In PostgreSQL it wouldn't be valid to do that so you'd have 
to do a full dump[1]. Having just checked, it is a suitable method for 
MyISAM - but what would you do if using InnoDB?

[1] Admittedly you can play about with transferring WAL journals as an 
incremental method, but from time to time you really need to get a fresh 
full dump. Or you could use full DB replication if your system/version 
supports it.

My argument here is, unless you really *need* to pull off having a massive 
DB, why not keep it small and simpler if sticking binary lumps into a 
filessystem makes for a smaller more efficient DB, quicker backups, quicker 
restore and maintenance operations and so on?

Back to the case in point, the photos database:

If you have a disaster recovery scenario - you could have a DB restore of 
metadata done fairly fast and the site back up. If you also needed to 
restore the filesystem with the actual photos, this could be run afterwards 
and the sites would gradually come back on by one. If you shove all the 
photos into the database, you won't have anything back until the entire 
restore is complete, unless you break the backup into 2 segments - one with 
all the tables and metadata *except* the photos table, and another one for 
the photos table.

I have never argued that a DB (MySQL or anything else) cannot handle photo 
data, but I'm arguing "just because you can do it, doesn't mean you should".

I take a holistic approach as I'm the one running the servers and datastores 
and backups - which means if backing up a heavily laden DB server is going 
to take hours or days and thus require special handling, there had better be 
a good reason it needs to. The whim of a DB application programmer wouldn't 
be good enough unless they could demonstrate a technical reason for it.

-- 
Tim Watts

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Thread

Can MySql database store images? "Robert Crandal" <rcranz143101@gmail.com> - 2011-04-23 23:47 -0700
  Re: Can MySql database store images? "J.O. Aho" <user@example.net> - 2011-04-24 09:23 +0200
    Re: Can MySql database store images? "Robert Crandal" <rcranz143101@gmail.com> - 2011-04-24 01:19 -0700
      Re: Can MySql database store images? "J.O. Aho" <user@example.net> - 2011-04-24 11:13 +0200
  Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-24 11:17 +0100
  Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-24 13:06 +0100
  Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 08:42 -0400
    Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-24 14:45 +0100
      Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 10:27 -0400
        Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-24 19:04 +0100
          Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 14:44 -0400
            Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-24 20:51 +0100
              Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 17:03 -0400
                Re: Can MySql database store images? Hans Castorp <REWYRLXHEGHO@spammotel.com> - 2011-04-24 23:18 +0200
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 19:55 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 08:30 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 06:32 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 12:04 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 07:18 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 13:32 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 09:09 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 14:17 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 19:29 -0400
                Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-25 12:30 +0100
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 13:59 +0100
                Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-25 18:10 +0100
        Re: Can MySql database store images? Norman Peelman <npeelman@cfl.rr.com> - 2011-04-24 16:40 -0400
          Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 17:05 -0400
            Re: Can MySql database store images? Norman Peelman <npeelman@cfl.rr.com> - 2011-04-25 02:57 -0400
              Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 08:59 +0100
                Re: Can MySql database store images? Norman Peelman <npeelman@cfl.rr.com> - 2011-04-25 21:41 -0400
                Re: Can MySql database store images? Norman Peelman <npeelman@cfl.rr.com> - 2011-04-26 06:20 -0400
                Re: Can MySql database store images? dougatmilmacdotcom@example.com (Doug Miller) - 2011-04-26 14:10 +0000
                Re: Can MySql database store images? Norman Peelman <npeelman@cfl.rr.com> - 2011-04-26 22:24 -0400
                Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-27 08:24 +0100
                Re: Can MySql database store images? Norman Peelman <npeelman@cfl.rr.com> - 2011-04-27 06:41 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-27 12:32 +0100
                Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-27 15:07 +0100
                Re: Can MySql database store images? "Peter H. Coffin" <hellsop@ninehells.com> - 2011-04-27 07:11 -0500
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-27 13:34 +0100
                Re: Can MySql database store images? "Peter H. Coffin" <hellsop@ninehells.com> - 2011-04-27 09:25 -0500
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-27 16:32 +0100
      Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 10:28 -0400
        Re: Can MySql database store images? Norman Peelman <npeelman@cfl.rr.com> - 2011-04-24 16:43 -0400
          Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 08:36 +0100
            Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 06:34 -0400
              Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 11:50 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 07:20 -0400
          Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-25 12:42 +0100
    Re: Can MySql database store images? Luuk <Luuk@invalid.lan> - 2011-04-24 16:27 +0200
      Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-24 15:38 +0100
        Re: Can MySql database store images? Luuk <Luuk@invalid.lan> - 2011-04-24 16:41 +0200
        Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-24 19:07 +0100
          Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 14:46 -0400
            Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-24 21:01 +0100
              Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 17:10 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 08:23 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 06:39 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 12:00 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 07:27 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 13:42 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 09:12 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 14:23 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 19:31 -0400
                Re: Can MySql database store images? "Mr. B-o-B" <mr.chew.baka@gmail.com> - 2011-04-25 20:30 -0500
          Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-25 12:21 +0100
            Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 13:46 +0100
      Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 13:23 -0400
        Re: Can MySql database store images? Luuk <Luuk@invalid.lan> - 2011-04-24 20:31 +0200
          Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 14:48 -0400
            Re: Can MySql database store images? Luuk <Luuk@invalid.lan> - 2011-04-24 21:11 +0200
    Re: Can MySql database store images? Axel Schwenke <axel.schwenke@gmx.de> - 2011-04-24 21:24 +0200
      Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 17:34 -0400
        Re: Can MySql database store images? Luuk <Luuk@invalid.lan> - 2011-04-25 12:04 +0200
          Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 06:40 -0400
            Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 11:48 +0100
              Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 07:28 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 13:36 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 09:17 -0400
                Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 14:30 +0100
                Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-25 18:13 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 19:37 -0400
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 19:35 -0400
    Re: Can MySql database store images? "Robert Crandal" <rcranz143101@gmail.com> - 2011-04-24 13:13 -0700
      Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 17:35 -0400
  Re: Can MySql database store images? Axel Schwenke <axel.schwenke@gmx.de> - 2011-04-24 21:29 +0200
    Re: Can MySql database store images? "Robert Crandal" <rcranz143101@gmail.com> - 2011-04-24 14:37 -0700
      Re: Can MySql database store images? Axel Schwenke <axel.schwenke@gmx.de> - 2011-04-25 00:41 +0200
        Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 20:16 -0400
          Re: Can MySql database store images? Axel Schwenke <axel.schwenke@gmx.de> - 2011-04-25 12:12 +0200
            Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 07:31 -0400
        Re: Can MySql database store images? Tim Watts <tw@dionic.net> - 2011-04-25 08:43 +0100
        Re: Can MySql database store images? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-05-01 09:59 +0200
      Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 20:03 -0400
    Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 17:39 -0400
      Re: Can MySql database store images? Axel Schwenke <axel.schwenke@gmx.de> - 2011-04-25 00:46 +0200
        Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-24 20:18 -0400
          Re: Can MySql database store images? Luuk <Luuk@invalid.lan> - 2011-04-25 12:13 +0200
            Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 06:43 -0400
              Re: Can MySql database store images? Luuk <Luuk@invalid.lan> - 2011-04-25 13:40 +0200
                Re: Can MySql database store images? The Natural Philosopher <tnp@invalid.invalid> - 2011-04-25 12:43 +0100
                Re: Can MySql database store images? Jerry Stuckle <jstucklex@attglobal.net> - 2011-04-25 09:19 -0400
                Re: Can MySql database store images? Luuk <Luuk@invalid.lan> - 2011-04-25 16:46 +0200

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