Comments on: bi-directional data synchronization on System i for db2 databases http://itknowledgeexchange.techtarget.com/itanswers/bi-directional-data-synchronization-on-system-i-for-db2-databases/ Fri, 25 May 2012 03:07:58 +0000 http://wordpress.org/?v=2.6.2 By: TomLiotta http://itknowledgeexchange.techtarget.com/itanswers/bi-directional-data-synchronization-on-system-i-for-db2-databases/#comment-74572 TomLiotta Sun, 07 Mar 2010 11:44:34 +0000 #comment-74572 [I]We would like to develop a custom sync solution using triggers and cross-reference files.[/I] I'm not clear what the question actually is. From that statement, it looks like you already know what you need to know. What's going to be interesting will be the "bi-directional" part. You'll have File1A in LibA and File1B in LibB. When File1A is updated, your xref table may say that File1B needs to be updated in a similar way. That's easy enough. But if it's "bi-directional", it would seem that you'll also want updates to File1B to be reflected in File1A, thereby potentially starting an infinite loop. Part of the trick, then, will be detecting the [I]source[/I] of the updates. If they're coming out of a trigger in the other database, you don't want to reflect those updates back in the other direction. Did you settle on a method? Tom We would like to develop a custom sync solution using triggers and cross-reference files.

I’m not clear what the question actually is. From that statement, it looks like you already know what you need to know.

What’s going to be interesting will be the “bi-directional” part.

You’ll have File1A in LibA and File1B in LibB. When File1A is updated, your xref table may say that File1B needs to be updated in a similar way. That’s easy enough.

But if it’s “bi-directional”, it would seem that you’ll also want updates to File1B to be reflected in File1A, thereby potentially starting an infinite loop.

Part of the trick, then, will be detecting the source of the updates. If they’re coming out of a trigger in the other database, you don’t want to reflect those updates back in the other direction.

Did you settle on a method?

Tom

]]> By: Aroyzen http://itknowledgeexchange.techtarget.com/itanswers/bi-directional-data-synchronization-on-system-i-for-db2-databases/#comment-51039 Aroyzen Fri, 04 Jan 2008 21:43:47 +0000 #comment-51039 Thanks for the answer, but let me clarify on my question. We are planning to have both databases on the same system, but the new database will be DDL-defined files as oppose for the existing one being DDS and the new tables will not be a mirror of existing files. We would like to develop a custom sync solution using triggers and cross-reference files. May be you have some suggestions about that. Thanks in advance. Thanks for the answer, but let me clarify on my question. We are planning to have both databases on the same system, but the new database will be DDL-defined files as oppose for the existing one being DDS and the new tables will not be a mirror of existing files. We would like to develop a custom sync solution using triggers and cross-reference files. May be you have some suggestions about that. Thanks in advance.

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