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Merge Replication and Trigger Problem

P: n/a
Hi,

I have an issue with my replication at the moment. I will try to
describe the scenario accurately.

I am using MS SQL 2000 SP4 with Merge Replication. Subscribers connect
to the publisher to upload/download changes. I have a trigger set up on
one table which updates another, here is an example of the trigger:

"CREATE TRIGGER qt_t_projTotal ON dbo.qt_quotes
FOR INSERT, UPDATE, DELETE
AS
declare @projTotal as money
declare @projId as int
declare @projcurrtype as int

select @projId = project_id from inserted
select @projcurrtype = proj_curr_type from qt_projects where project_id
= @projId

--Get project total from the sum of table [qt_quotes]
select @projTotal = (select
sum(dbo.fConvertCurrency(quot_grnd_totl,quot_curr_ type,@projcurrtype))
as quoteTotal from qt_quotes where project_id = @projId)

--Update projects record with new project total
update qt_projects
set proj_act_totl = @projTotal
where project_id = @projId"

I feel my trigger maybe setup incorrectly in that replication thinks an
insert is occurring instead of an update. (Im quite new to triggers)
What is happening is a conflict is occuring with the following message:

"The row was inserted at Server.Publisher' but could not be inserted at
'Subscriber.database'. INSERT statement conflicted with COLUMN FOREIGN
KEY constraint 'FK_qt_quotes_qt_projects'. The conflict occurred in
database 'Publisher', table 'qt_projects', column 'project_id'."

What is also happening as a result of this conflict (I think) is the
record in question is getting deleted from the Publisher. This is
causing huge problems as it is proving quite difficult to get these
records back in the system due to identity values.

Can anyone guide me to what might be happeing here, is it the trigger?

Jan 4 '07 #1
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8 Replies


P: n/a
Benzine wrote:
Hi,

I have an issue with my replication at the moment. I will try to
describe the scenario accurately.

I am using MS SQL 2000 SP4 with Merge Replication. Subscribers connect
to the publisher to upload/download changes. I have a trigger set up on
one table which updates another, here is an example of the trigger:

"CREATE TRIGGER qt_t_projTotal ON dbo.qt_quotes
FOR INSERT, UPDATE, DELETE
AS
declare @projTotal as money
declare @projId as int
declare @projcurrtype as int

select @projId = project_id from inserted
select @projcurrtype = proj_curr_type from qt_projects where project_id
= @projId

--Get project total from the sum of table [qt_quotes]
select @projTotal = (select
sum(dbo.fConvertCurrency(quot_grnd_totl,quot_curr_ type,@projcurrtype))
as quoteTotal from qt_quotes where project_id = @projId)

--Update projects record with new project total
update qt_projects
set proj_act_totl = @projTotal
where project_id = @projId"
First thing to notice here is that your trigger is going to have issues
with any multi-row insert/update/delete statements. You need to get
that fixed.

However, I don't think that's your problem...
I feel my trigger maybe setup incorrectly in that replication thinks an
insert is occurring instead of an update. (Im quite new to triggers)
What is happening is a conflict is occuring with the following message:

"The row was inserted at Server.Publisher' but could not be inserted at
'Subscriber.database'. INSERT statement conflicted with COLUMN FOREIGN
KEY constraint 'FK_qt_quotes_qt_projects'. The conflict occurred in
database 'Publisher', table 'qt_projects', column 'project_id'."

What is also happening as a result of this conflict (I think) is the
record in question is getting deleted from the Publisher. This is
causing huge problems as it is proving quite difficult to get these
records back in the system due to identity values.

Can anyone guide me to what might be happeing here, is it the trigger?
Merge replication is funny. So far as I can work out, in 2000, you
cannot force the merges to happen in a particular order. So it's
possible for it to merge data in the referencing table before it merges
data in the referenced table, for a particular foreign key.

In our systems, we've marked all of the foreign keys as "not for
replication", which has eliminated these kinds of errors for us. I'm
not sure what your options are if you cannot cope with "orphan" rows
appearing for brief moments of time.

On a side note (not applicable to OP), in 2005 you can specify the
order in which articles are processed. But I can't see how that can be
useful to anyone, since, in general, you would want to process inserts
in one order (for foreign keys to always work), and deletes in the
opposite order, surely?

Damien

Jan 4 '07 #2

P: n/a
Thanks for your reply Damien,

Is unchecking "Enforce relationships for replication" the same as
marking FK "Not for Replication"

Damien wrote:
Benzine wrote:
Hi,

I have an issue with my replication at the moment. I will try to
describe the scenario accurately.

I am using MS SQL 2000 SP4 with Merge Replication. Subscribers connect
to the publisher to upload/download changes. I have a trigger set up on
one table which updates another, here is an example of the trigger:

"CREATE TRIGGER qt_t_projTotal ON dbo.qt_quotes
FOR INSERT, UPDATE, DELETE
AS
declare @projTotal as money
declare @projId as int
declare @projcurrtype as int

select @projId = project_id from inserted
select @projcurrtype = proj_curr_type from qt_projects where project_id
= @projId

--Get project total from the sum of table [qt_quotes]
select @projTotal = (select
sum(dbo.fConvertCurrency(quot_grnd_totl,quot_curr_ type,@projcurrtype))
as quoteTotal from qt_quotes where project_id = @projId)

--Update projects record with new project total
update qt_projects
set proj_act_totl = @projTotal
where project_id = @projId"
First thing to notice here is that your trigger is going to have issues
with any multi-row insert/update/delete statements. You need to get
that fixed.

However, I don't think that's your problem...
I feel my trigger maybe setup incorrectly in that replication thinks an
insert is occurring instead of an update. (Im quite new to triggers)
What is happening is a conflict is occuring with the following message:

"The row was inserted at Server.Publisher' but could not be inserted at
'Subscriber.database'. INSERT statement conflicted with COLUMN FOREIGN
KEY constraint 'FK_qt_quotes_qt_projects'. The conflict occurred in
database 'Publisher', table 'qt_projects', column 'project_id'."

What is also happening as a result of this conflict (I think) is the
record in question is getting deleted from the Publisher. This is
causing huge problems as it is proving quite difficult to get these
records back in the system due to identity values.

Can anyone guide me to what might be happeing here, is it the trigger?

Merge replication is funny. So far as I can work out, in 2000, you
cannot force the merges to happen in a particular order. So it's
possible for it to merge data in the referencing table before it merges
data in the referenced table, for a particular foreign key.

In our systems, we've marked all of the foreign keys as "not for
replication", which has eliminated these kinds of errors for us. I'm
not sure what your options are if you cannot cope with "orphan" rows
appearing for brief moments of time.

On a side note (not applicable to OP), in 2005 you can specify the
order in which articles are processed. But I can't see how that can be
useful to anyone, since, in general, you would want to process inserts
in one order (for foreign keys to always work), and deletes in the
opposite order, surely?

Damien
Jan 4 '07 #3

P: n/a
Benzine wrote:
Thanks for your reply Damien,

Is unchecking "Enforce relationships for replication" the same as
marking FK "Not for Replication"
Um, yes, I believe so. (Being a poncy type, I tend to do all this kind
of work through writing SQL rather than using Enterprise Manager, but
it looks like it's the sensible choice).

Damien

Jan 4 '07 #4

P: n/a
Damien wrote:
On a side note (not applicable to OP), in 2005 you can specify the
order in which articles are processed. But I can't see how that can be
useful to anyone, since, in general, you would want to process inserts
in one order (for foreign keys to always work), and deletes in the
opposite order, surely?
I suppose it could work if (1) the order is reversed for deletes, either
automatically or by request, or (2) cascade-delete triggers are used.
Jan 4 '07 #5

P: n/a
Thanks allot for your help.
I will make the changes and issue a new snapshot then cross my fingers.

On Jan 5, 1:02 am, "Damien" <Damien_The_Unbelie...@hotmail.comwrote:
Benzine wrote:
Thanks for your reply Damien,
Is unchecking "Enforce relationships for replication" the same as
marking FK "Not for Replication"Um, yes, I believe so. (Being a poncy type, I tend to do all this kind
of work through writing SQL rather than using Enterprise Manager, but
it looks like it's the sensible choice).

Damien
Jan 4 '07 #6

P: n/a
Hi Damien,

You wouldnt by chance have a script that can update the
status_for_replication to Not_For_Replication for all FK's?

Ben

On Jan 4, 7:37 pm, "Damien" <Damien_The_Unbelie...@hotmail.comwrote:
Benzine wrote:
Hi,
I have an issue with my replication at the moment. I will try to
describe the scenario accurately.
I am using MS SQL 2000 SP4 with Merge Replication. Subscribers connect
to the publisher to upload/download changes. I have a trigger set up on
one table which updates another, here is an example of the trigger:
"CREATE TRIGGER qt_t_projTotal ON dbo.qt_quotes
FOR INSERT, UPDATE, DELETE
AS
declare @projTotal as money
declare @projId as int
declare @projcurrtype as int
select @projId = project_id from inserted
select @projcurrtype = proj_curr_type from qt_projects where project_id
= @projId
--Get project total from the sum of table [qt_quotes]
select @projTotal = (select
sum(dbo.fConvertCurrency(quot_grnd_totl,quot_curr_ type,@projcurrtype))
as quoteTotal from qt_quotes where project_id = @projId)
--Update projects record with new project total
update qt_projects
set proj_act_totl = @projTotal
where project_id = @projId"First thing to notice here is that your trigger is going to have issues
with any multi-row insert/update/delete statements. You need to get
that fixed.

However, I don't think that's your problem...
I feel my trigger maybe setup incorrectly in that replication thinks an
insert is occurring instead of an update. (Im quite new to triggers)
What is happening is a conflict is occuring with the following message:
"The row was inserted at Server.Publisher' but could not be inserted at
'Subscriber.database'. INSERT statement conflicted with COLUMN FOREIGN
KEY constraint 'FK_qt_quotes_qt_projects'. The conflict occurred in
database 'Publisher', table 'qt_projects', column 'project_id'."
What is also happening as a result of this conflict (I think) is the
record in question is getting deleted from the Publisher. This is
causing huge problems as it is proving quite difficult to get these
records back in the system due to identity values.
Can anyone guide me to what might be happeing here, is it the trigger?Merge replication is funny. So far as I can work out, in 2000, you
cannot force the merges to happen in a particular order. So it's
possible for it to merge data in the referencing table before it merges
data in the referenced table, for a particular foreign key.

In our systems, we've marked all of the foreign keys as "not for
replication", which has eliminated these kinds of errors for us. I'm
not sure what your options are if you cannot cope with "orphan" rows
appearing for brief moments of time.

On a side note (not applicable to OP), in 2005 you can specify the
order in which articles are processed. But I can't see how that can be
useful to anyone, since, in general, you would want to process inserts
in one order (for foreign keys to always work), and deletes in the
opposite order, surely?

Damien- Hide quoted text -- Show quoted text -
Jan 5 '07 #7

P: n/a
Benzine wrote:
Hi Damien,

You wouldnt by chance have a script that can update the
status_for_replication to Not_For_Replication for all FK's?

Ben
I'm afraid not. I believe that the first time I encountered this
problem for a project, what I ended up doing was scripting out all of
the foreign keys to a script file. Then using an editor with support
for regular expressions in find and replace (in my case, Visual
Studio), I edited the file to include the "NOT FOR REPLICATION" at the
appropriate places in the file (see Books On Line for ALTER TABLE to
find the right syntax). Then I wrote another script which just tore
down all existing foreign keys in the database. Applying these scripts
in the correct order produced the necessary changes.

On the second project, I had it included from the start, so I've never
had to do this again.

Damien

Jan 5 '07 #8

P: n/a
Thanks again.

Damien wrote:
Benzine wrote:
Hi Damien,

You wouldnt by chance have a script that can update the
status_for_replication to Not_For_Replication for all FK's?

Ben
I'm afraid not. I believe that the first time I encountered this
problem for a project, what I ended up doing was scripting out all of
the foreign keys to a script file. Then using an editor with support
for regular expressions in find and replace (in my case, Visual
Studio), I edited the file to include the "NOT FOR REPLICATION" at the
appropriate places in the file (see Books On Line for ALTER TABLE to
find the right syntax). Then I wrote another script which just tore
down all existing foreign keys in the database. Applying these scripts
in the correct order produced the necessary changes.

On the second project, I had it included from the start, so I've never
had to do this again.

Damien
Jan 5 '07 #9

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