Hi, I don't want to get in the way, but I am experiencing similar issues. Here's the
problem I'm trying to find a resolution to:
We have one instance of MySQL (it was configured and installed once). This instance
has
one 'test' 'database', and one 'mysql' 'database'. The mysql database contains the
grant
tables.
I want to create a few other 'databases'. One should be used for keeping recipies, for
instance, and the other will contain the data I use for the electronic key card system
I
use in my house (for instance). Both databases run under the same 'instance'.
The recipe database is updated frequently, because I am active in a cook's collective
and
we routinely update each other's recipies as we develop more refined ways of making the
dishes. The key card database is not updated frequently, but is heavily accessed by
several custom-made hardware devices.
One day, a bug in the network protocol I use to connect the card swipe device to the
database causes some of the data in the database to become corrupted in the key card
database. This happens as I get home late at night after bar hopping, and I don't
discover it until noon. The corruption involves data that was deleted, so I need to
restore that database to just before midnight, using the full backup I wisely took at
8PM
before going out to the bars, in conjunction with the update log which I have on a
RAID5
device for protection.
The problem is, that if I restore the database from the last cold backup, then apply
the
update log until midnight, I will lose all transactions that occurred against the
recipe
database between midnight and noon the next day!
Oracle and SQL Server allow you to restore databases independently of one another. I
cannot discern the method to do so in MySQL. Surely this is a common requirement? Is
there an easy answer I have overlooked during my evaluation of the restore options?
By the way, the above scenario assumes MyISAM table types. I understand from other
postings that InnoDB can restrict the options even further. The obvious solution seems
to be separate MySQL 'instances' for each database you want, so that the transaction
logs
are kept distinct from one another. If this is the preferred solution, I would be
interested to hear how some production environments have been set up.
Thanks!
Josh Horton
Francisco Reinaldo wrote:
Hi Chris,
I am Tom, you know your manager, did you say that I am
wrong!!!
Just kidding :-).
Well I cannot find any good reason for having two
databases in two different instance. Do you have two
Oracles or Microsoft SQL Server instances in the
computer? Nope.
The only reason when that is acceptable, is when you
want to keep two version of the same database engine.
Like having 3.23 and 4.0.
Having two MySQL instances is going to complicate
things making everything more difficult to maintain
and install.
Good Luck.
--- Cal Evans [EMAIL PROTECTED] wrote:
The pros are you can run them under separate
user/group ids therefore you
can make it much harder for someone with access to
only one to get to the
other's data.
The cons are that you will have 2 copies running
therefore it will take
longer to maintain.
=C=
*
* Cal Evans
* Journeyman Programmer
* Techno-Mage
* http://www.calevans.com
*
-Original Message-
From: Chris Stefanick
[mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 05, 2002 7:56 AM
To: MySQL Support
Subject: setting up two instances of mySQL
I have one product already using a mySQL database.
We just inherited a new
product (via an acquisition) that uses it's own
mySQL database which we're
going to stick on the same server. My manager wants
me to setup a second
instance of mySQL on the machine for the new
product's database. I don't
see the point. Why not just have both databases
running under the same
instance of mySQL? Which brings me to my question.
What are the pros and
cons of setting up multiple instances of mySQL on
the same machine?
Thanks so much,
CS
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