473,324 Members | 1,856 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,324 software developers and data experts.

multiple databases in one instance

What is the IBM recommendation for the number of DB2-LUW databases per
instance on AIX? With Oracle, it is one-to-one. In DB2 multiple
databases can co-exist in an instance but is this recommended? What
should be considered in making this decision?
Sep 30 '08 #1
1 7358
ri***********@ama-assn.org wrote:
What is the IBM recommendation for the number of DB2-LUW databases per
instance on AIX? With Oracle, it is one-to-one. In DB2 multiple
databases can co-exist in an instance but is this recommended? What
should be considered in making this decision?
Richard,

I've got a production instance running over 30 databases, and development
ones running over 50. Most of theses are small databases which are fairly
lightly used; if you had something which was very large or very heavily
utilised then I'd give it a dedicated instance.

I'm not sure there is an "official" IBM recommendation, but I think in
general they'd consider that 30 databases was too many for one instance !!!

Some things I've found -

Some tools expects that you've only got one database in an instance,
especially some of the tuning ones. In fact you'd almost think some of
them only expected you to run one database per box : you'd think the tools
were written by a hardware vendor ... oh wait, did I miss something ;-)

Multiple databases per instance is more memory efficient than lots of
instances with one database each. The new STMM (Self Tuning Memory
Management) seems to work fine with multiple databases in an instance. I'm
not sure that WLM (Work Load Management) is as happy about this.

There have been reports that the new thread-based model is less tolerant of
high numbers of databases per instance than the old process-based one was,
especially for 32-bit instances. That should not affect most people these
days however.

HTH

Phil Nelson
ScotDB Limited


Sep 30 '08 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

2
by: RJ | last post by:
We currently send product releases to our customers, and often have to include scripts that need to be ran on the Oracle databases (also do it for SqlServer customers, but we use a different set of...
1
by: Sergio | last post by:
Hi everybody, I have the following scenario. Several computers with shared disk in a LAN. Each of these computer has a MySQL server that serves several databases. I have several clients that...
11
by: Mike | last post by:
Looking to find any information on how to properly configure multiple instances of DB2. This is on Win2k db2 ver 7.2. I am basically looking for information on how the multiple instance settings...
5
by: hikums | last post by:
How are multiple instances monitored? For example, there are 30 instances running on a AIX BOX running DB2 V8, is ps -ef |grep "inst" the best way to see if the instance is running, where instanes...
1
by: Andy S. | last post by:
Hi, I'm running DB2 V 7.1 and I wish to write a SELECT query that queries tables in multiple tables in different databases on the same instance. Is this possible and if so, what should the FROM...
9
by: TC | last post by:
I need to design a system which represents multiple "projects" in SQL Server. Each project has the same data model, but is independent of all others. My inclination is to use one database to store...
1
by: jdokos | last post by:
Hi, Has anyone used STMM with multiple instances on the same machine in V9? From all the documentation I have read it looks like this should work and that there is nothing 'special' that needs...
6
by: GregG | last post by:
Greetings, I've inherited a project which requires the use of multiple Access databases, each containing a dozen or so tables each. I need to perform queries which included relations and results...
10
by: Frankie | last post by:
It appears that System.Random would provide an acceptable means through which to generate a unique value used to identify multiple/concurrent asynchronous tasks. The usage of the value under...
0
by: ryjfgjl | last post by:
ExcelToDatabase: batch import excel into database automatically...
0
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: jfyes | last post by:
As a hardware engineer, after seeing that CEIWEI recently released a new tool for Modbus RTU Over TCP/UDP filtering and monitoring, I actively went to its official website to take a look. It turned...
1
by: PapaRatzi | last post by:
Hello, I am teaching myself MS Access forms design and Visual Basic. I've created a table to capture a list of Top 30 singles and forms to capture new entries. The final step is a form (unbound)...
1
by: Defcon1945 | last post by:
I'm trying to learn Python using Pycharm but import shutil doesn't work
1
by: Shællîpôpï 09 | last post by:
If u are using a keypad phone, how do u turn on JavaScript, to access features like WhatsApp, Facebook, Instagram....
0
by: af34tf | last post by:
Hi Guys, I have a domain whose name is BytesLimited.com, and I want to sell it. Does anyone know about platforms that allow me to list my domain in auction for free. Thank you
0
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.