SQL Remote replication problem
We have an ASA 7.0.3.2046 setup with several branches replicating to and
from a consolidated database via SQL Remote. At each end we have the
following trigger on one of our tables:
alter trigger
DBA.tub_item before update on auction.item
referencing old as old_upd new as new_upd
for each row
begin
if current remote user is null then
set new_upd.last_modified_by=current user;
set new_upd.date_last_modified=getdate(*)
end if
end
The problem that sometimes occurs is this. A user updates a field on the
item table, which fires the trigger. The update action and the trigger
action are replicated to the consolidated database (we have replication of
trigger actions turned on). On the consolidated database the trigger fires
but does nothing, caught by the "if current remote user" condition. So far,
so good but then the consolidated database replicates the trigger action,
but not the original update action, back to the branch database again, where
it may override actions taken on the branch database during the time it took
for replication to occur.
Has anyone else seen, and preferably solved, a problem like this?
David Tillotson
Pickles Auctions
david.tillotson@pickles.com.au
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0 |
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David
4/10/2003 10:05:56 PM
sybase.sqlanywhere.replication
4591 articles. 
0 followers.
1 Replies
649 Views
This is a conflict resolution issue. Have you implemented a conflict resolution trigger? If not, you may need to. The default rule is 'last one in wins' which means the last update to reach the consolidated will be retained. The result of a conflict resolution will be echoed back to all subscribers. As you noted there may be temporary inconsistencies, but assuming that the last update originating at the remote was already being replicated, the system will catch up with a consistent state at all sites. -- ----------------------------------------------- Robert Waywell Sybase Adaptive Server Anywhere Developer - Version 8 Sybase Certified Professional Sybase's iAnywhere Solutions Please respond ONLY to newsgroup EBF's and Patches: http://downloads.sybase.com choose SQL Anywhere Studio >> change 'time frame' to all To Submit Bug Reports: http://casexpress.sybase.com/cx/cx.stm SQL Anywhere Studio Supported Platforms and Support Status http://my.sybase.com/detail?id=1002288 Whitepapers, TechDocs, and bug fixes are all available through the iAnywhere Developer Community at www.ianywhere.com/developer "David Tillotson" <david.tillotson@pickles.com.au> wrote in message news:eqUMd46$CHA.331@forums-2-dub... > We have an ASA 7.0.3.2046 setup with several branches replicating to and > from a consolidated database via SQL Remote. At each end we have the > following trigger on one of our tables: > > alter trigger > DBA.tub_item before update on auction.item > referencing old as old_upd new as new_upd > for each row > begin > if current remote user is null then > set new_upd.last_modified_by=current user; > set new_upd.date_last_modified=getdate(*) > end if > end > > The problem that sometimes occurs is this. A user updates a field on the > item table, which fires the trigger. The update action and the trigger > action are replicated to the consolidated database (we have replication of > trigger actions turned on). On the consolidated database the trigger fires > but does nothing, caught by the "if current remote user" condition. So far, > so good but then the consolidated database replicates the trigger action, > but not the original update action, back to the branch database again, where > it may override actions taken on the branch database during the time it took > for replication to occur. > > Has anyone else seen, and preferably solved, a problem like this? > > > David Tillotson > Pickles Auctions > david.tillotson@pickles.com.au > > >
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Robert
4/11/2003 2:56:02 PM
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