Solved

multiple databases staying in real-time sync

Posted on 2006-10-23
3
293 Views
Last Modified: 2006-11-18
Hello Experts,

   I'm looking for opinions/suggestions on a project I'm working on.  I have four stations/PC's setup which will be used to submit user data from a form to a mysql database housed locally on each station.  The reason for housing locally is each station is independent of each other if for some reason hardware/software failure occurs.  My problem is:  I need to keep all submitted data updated on all 4 stations so that I do not get repeat data entered from two different workstations.  I'm thinking some type of automated sync, or sync every second, or sync per transaction.  Any opinions/suggestions on the best way to approach this is greatly appreciated.

Thanks
0
Comment
Question by:itwanlan
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 22

Expert Comment

by:NovaDenizen
ID: 17796982
Your requirements are somewhat contradictory.  You want things to stay synchronized, but you also want them to keep working even when communications go down.  I think you need to decide which of those requirements is more important.  

If avoidance of inconsistency is more important, then you need a single central server.  If your communications go down to the central server, you can't make any changes.  You could use replication to maintain a local read-only copy of the central server so you could still have access to an old copy of the data when communications are down.

If it's more important to let people make changes while communications is down, then you have to maintain 4 separate local databases, and you need a piece of software that can look at the timestamps on the most recent records in each database and fix any inconstencies that are detected, so consistency is eventually restored.  Consistency is something that is continually lost and regained.  
0
 
LVL 6

Accepted Solution

by:
chigs20 earned 250 total points
ID: 17796994
What you're looking for is a Master/Master setup (Each server acts as a master and a slave).  Here is an article explaining it and how to:
http://dev.mysql.com/tech-resources/articles/advanced-mysql-replication.html
0
 

Author Comment

by:itwanlan
ID: 17815657
Thanks for the answer chigs.

I think this will be exactly what we are looking for.
0

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
change database name 2 46
How do uses indexes to maximize MySQL Searches 14 75
mysql query for sum() 3 58
Make outcome of query just echo out once for each foreign id 4 36
All XML, All the Time; More Fun MySQL Tidbits – Dynamically Generate XML via Stored Procedure in MySQL Extensible Markup Language (XML) and database systems, a marriage we are seeing more and more of.  So the topics of parsing and manipulating XM…
I have been using r1soft Continuous Data Protection (http://www.r1soft.com/linux-cdp/) for many years now with the mySQL Addon and wanted to share a trick I have used several times. For those of us that don't have the luxury of using all transact…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question