Merge Replication – Bug In Business Logic Update Handler
Nov 17, 2006
I have got a business logic update conflict handler working, but I have had to work round what appears to be a bug.
Please can someone confirm if this is indeed a bug €“ and if it is a known bug?
My conflict handler needs to take some columns from the publisher row and some from the subscriber row in the event of conflict.
I can quite happily generate a custom dataset which contains the winning row that I want €“ I can see that because I can step through the conflict handler with debug when a conflict occurs.
However, just returning ActionOnUpdateConflict.AcceptCustomConflictData from the UpdateConflictsHandler method does not set the publisher and subscriber columns correctly. I end up with different values on the two databases.
I have found that the only way to get the correct rows on both publisher and subscriber is to create a new ADO connection to the publisher and actually perform an update €“ updating all the modified columns. This now works reliably in my testing.
Fortunately, due to business rules the frequency of update conflicts are likely to be very infrequent, but I would very much like to avoid having to do the €˜unnecessary€™ update.
Notes:
I am using column level tracking €“ but I have seen the problem with row level tracking too
I have mainly been using SP1 but have repeated the test on a configuration using the SP2 CTP €“ and the problem occurs there too
The problem is not due to complex logic in my code. If the method just sets customDataSet = publisherDataSet.Copy and then returns ActionOnUpdateConflict.AcceptCustomConflictData, the changed and winning publisher values are not sent to the subscriber
Any thoughts would be much appreciated
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Jul 23, 2007
Pocket PC 2003, SQL Compact Edition, SQL2005, IIS6.0
I implemented a business logic handler to deal with conflicts. When I deploy it on the SQL server which is also the web replication server, the logic handler seems working fine. However, if I deploy this handler to another web server. The logic handler failed to be loaded.
My enviroment settings are desribed as below.
Machine A, distributor, with database and publication. The business logic handler is deployed at C:Program FilesMicrosoft SQL Server90COMBusinessLogicHandler.dll. It's registered by using sp_registercustomresolver. The @assembly is specified as @assembly=C:Program FilesMicrosoft SQL Server90COMBusinessLogicHandler.dll';
Machine B, IIS server. The same business logic handler is deployed at C:Program FilesMicrosoft SQL Server90COMBusinessLogicHandler.dll on the Machine B itself.
When I ran the web replication, the Merge Agent reported the error as below.
Error loading custom assembly "C:Program FilesMicrosoft SQL Server90COMBusinessLogicHandler.dll", Error: "Could not load file or assembly 'C:\Program Files\Microsoft SQL Server\90\COM\BusinessLogicHandler.dll' or one of its dependencies. The given assembly name or codebase was invalid.
It seemed that the Merge Agent had trouble to find my logic handler because the path reported in the error log has two backward slashes. I have no idea where did that came from. I am not sure if that's the cause of the error. Without business logic handler. I had successfully finished web replication of Machine B to sync with Machine A. If I setup web replication directly on Machine A with business logic handler, I can successfully sync as well.
Does anyone has any idea about how to correctly deploy business logic handler on a web server?
Thanks,
Nigel
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Nov 7, 2006
I'm trying to implement a custom conflict resolver by inheriting from
Microsoft.SqlServer.Replication.BusinessLogicSupport.BusinessLogicModule. The replication is between a SQL Server 2005 Express subscriber and a SQL Server 2005 publisher/distributer.
The problem is that the resolver class in the DLL will not load; although, it does appear to find the DLL. (If I rename the DLL I get a "file not found error"). The exact error message is:
Microsoft.SqlServer.Replication.ComErrorException
"Error loading custom class "MergeConflictHandler" from custom assembly "MergeConflictHandler",
Error : "Could not load type 'MergeConflictHandler' from assembly 'MergeConflictHandler, Version=1.0.2502.22393, Culture=neutral, PublicKeyToken=0403e50cc4dc27fa'."."}
I placed the DLL in the directory of the program that calls SynchronizationAgent.Synchronize and tried it with and without being registered in the GAC. There was no change. Interestingly, when I move the file out of that location, but register it in the GAC, the file is not found. Thinking it may be a security problem, I gave Everyone Read & Execute and Read privileges. I believe the class is actually instantiated by replmerge.exe, an apparantly unmanaged app, so I tried marking it ComVisible. No Luck.
I registered the resolver with the following T-SQL code:
sp_registercustomresolver @article_resolver = 'eClinical Notes Conflict Resolver'
, @is_dotnet_assembly = 'true'
, @dotnet_assembly_name = 'MergeConflictHandler'
, @dotnet_class_name = 'MergeConflictHandler'
, @resolver_clsid = Null
The resolver I've created is not much more than a shell at this point. It is pasted below, but I tried using the code found on MSDN character-for-character and had the same problem.
using System;
using System.Text;
using System.Data;
using System.Data.Common;
using Microsoft.SqlServer.Replication.BusinessLogicSupport;
namespace MergeConflictHandler
{
public class MergeConflictHandler :
Microsoft.SqlServer.Replication.BusinessLogicSupport.BusinessLogicModule
{
// Variables to hold server names.
private string m_PublisherName;
private string m_SubscriberName;
private string m_Artical_Name;
public MergeConflictHandler()
{
}
// Implement the Initialize method to get publication
// and subscription information.
public override void Initialize(string publisher, string subscriber, string distributor, string publisherDB, string subscriberDB,string articleName)
{
m_PublisherName = publisher;
m_SubscriberName = subscriber;
m_Artical_Name = articleName;
}
// Declare what types of row changes, conflicts, or errors to handle.
public override ChangeStates HandledChangeStates
{
get
{
return ChangeStates.UpdateConflicts;
}
}
public override ActionOnUpdateConflict UpdateConflictsHandler(DataSet publisherDataSet, DataSet subscriberDataSet, ref DataSet customDataSet, ref ConflictLogType conflictLogType, ref string customConflictMessage, ref int historyLogLevel, ref string historyLogMessage)
{
if (m_Artical_Name == "PatientAllergies")
{
// Accept the updated data in the Subscriber's data set and apply it to the Publisher.
}
return ActionOnUpdateConflict.AcceptPublisherData;
}
}
}
Does anyone have any thoughts or advice? (Help!)
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Jul 10, 2006
hi,
i'm following steps described at: http://msdn2.microsoft.com/en-us/library/ms365150.aspx
all goes fine until step 6. of paragraph "To debug a business logic handler on a Web server using Web synchronization, or for a SQL Server Mobile Subscriber".
in my case when attaching to w3wp.exe i can only debug t-sql or native code. when i forcibly check 'managed' i get: "Unable to attach to the process. Access is denied". error picture:
http://img156.imageshack.us/my.php?image=debuggingerror7bp.jpg
i KNOW that the business logic handler gets loaded and executed because i am logging some info in it. i would be grateful for any suggestions.
TIA, kamil nowicki
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Oct 25, 2007
Hi,
I am performing the Merge Replication of Timesheet table between SQL server 2005 and SQL CE on the Pocket PC. For one of the article, I would like to perform web synch for only those rows which have certain field set to true.
I am trying to use Business Logic Handler to implement this logic. I am using following code out of sample on MSDN web site. However I am not sure if this code gets executed for each row for a table during synch or does this get executed once for each table? The answer would help me write logic on applying synch changes only for few rows.
Thanks
public override ActionOnDataChange UpdateHandler(SourceIdentifier updateSource,
DataSet updatedDataSet, ref DataSet customDataSet, ref int historyLogLevel,
ref string historyLogMessage)
{
if (updateSource == SourceIdentifier.SourceIsPublisher)
{
//check the approved status of the timesheet
if (updatedDataSet.Tables["tbl_timesheets"].Rows[0]["ts_approved"] == true)
{
// Set the reference parameter to write the line to the log file.
historyLogMessage = updatedDataSet.Tables["tbl_timesheets"].Rows[0]["ts_id"].ToString();
// Set the history log level to the default verbose level.
historyLogLevel = 1;
// Accept the updated data in the Subscriber's data set and apply it to the Publisher.
return ActionOnDataChange.AcceptData;
}
else
{
return ActionOnDataChange.RejectData;
}
}
else
{
return base.UpdateHandler(updateSource, updatedDataSet,
ref customDataSet, ref historyLogLevel, ref historyLogMessage);
}
}
Any Help is appreciated.
Thanks
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May 17, 2007
When running a business logic handler at the subscriber, you can override SubscriberInserts, SubscriberUpdates and SubscriberDeletes. Are these methods called when data is changed coming from the server to client, from the client to the server, or in both directions?
Thanks,
Bryan
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Oct 25, 2007
Hi,
I have 2 related tables in SQL 2005. I am using Business Logic Handler on one of those tables during Merge Replication to reject data for few rows during web synchronization. Once a row is rejected, I would like to run the Business Logic Handler for the related table to reject changes for the row with same foreign key as the rejected row in first table.
Not sure if I need to create separate Business Logic Handlers for each table or can it be achieved in a single Handler.
Also is it possible to get a list of rejected rows back from the handler?
Thanks for help.
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Mar 1, 2007
I am currenly have a simple merge replication topology. The publisher-distibutor is SQL Server 2005 and the subscriber is a SQL Server Express. The type of subscription is non anonymous pull.
I made a custom business logic handler class that is trying the following:
When a new record is inserted in a published table on the pubsliher, some additional records are added in a differenct table in subscriber. Then the "InsertHandler" method returns "AcceptData" in order to allow the agent to add the new record in current table also.
So I am establishing a new connection to the subscriber and I am trying to add the additional recs in the different table. The problem is that this different table is also published as read-only on the subscriber. So my insert fails saying that table is not updatable.
Is there any way to bypass this problem?
In fact I realised in general that when my custom logic handler performs some DML operations on the subscriber, these are NOT considered as part of the replication e.g. the NOT FOR REPLICATION constraints and triggers are active for these operations.
Is this normal?
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Apr 21, 2015
I am currently working with C and SQL Server 2012. My requirement is to Bulk fetch the records and Insert/Update the same in the other table with some business logic? How do i do this?
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Feb 26, 2008
Or maybe it can't find something it's looking for to make my additional symetrical with everything else. This is from one of my businesslogic files. What causes Visual Studio to not allow me to add something here and have it behave like the other parameters/ I'm talking about ShortDesc. Visual studio inserted () and the Get instead of GET like all the others. It would not allow me to capitalize the "get". There has to be a reason for this. Currently my program is adding all of the fields except the ShortDesc to the table in my database. Does anyone have any thoughts as to why this is the case?
#Region "Pvt Members" Private _ArticleID As System.Int32 Private _UserID As System.Int32 Private _WebSiteID As System.Int32 Private _ArticleTitle As System.String Private _Author As System.String Private _ShortDesc As System.String Private _ArticleText As System.String Private _AnchorText As System.String Private _ShowInDirectory As System.Boolean Private _Active As System.Boolean Private _DateAdded As System.DateTime#End Region#Region "Properties" Public Property ArticleID As System.Int32 GET Return _ArticleID End Get Set(ByVal Value As System.Int32) _ArticleID= Value End Set End Property Public Property UserID As System.Int32 GET Return _UserID End Get Set(ByVal Value As System.Int32) _UserID= Value End Set End Property Public Property WebSiteID As System.Int32 GET Return _WebSiteID End Get Set(ByVal Value As System.Int32) _WebSiteID= Value End Set End Property Public Property ArticleTitle As System.String GET Return _ArticleTitle End Get Set(ByVal Value As System.String) _ArticleTitle= Value End Set End Property Public Property Author As System.String GET Return _Author End Get Set(ByVal Value As System.String) _Author= Value End Set End Property Public Property ShortDesc() As System.String Get Return _ShortDesc End Get Set(ByVal value As System.String) End Set End Property Public Property ArticleText As System.String GET Return _ArticleText End Get Set(ByVal Value As System.String) _ArticleText= Value End Set End Property Public Property AnchorText As System.String GET Return _AnchorText End Get Set(ByVal Value As System.String) _AnchorText= Value End Set End Property Public Property ShowInDirectory As System.Boolean GET Return _ShowInDirectory End Get Set(ByVal Value As System.Boolean) _ShowInDirectory= Value End Set End Property Public Property Active As System.Boolean GET Return _Active End Get Set(ByVal Value As System.Boolean) _Active= Value End Set End Property Public Property DateAdded As System.DateTime GET Return _DateAdded End Get Set(ByVal Value As System.DateTime) _DateAdded= Value End Set End Property #End Region
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Feb 21, 2006
Hi, I'am using several SQL 2000 servers with different working merge-replications. Actually I wrote a .NET assembly which makes updates to key values in one of the replicated tables:
Ex:
update ReplTable set key = -key where key between (1 and 100)
Loop
......
update ReplTable set key = NewKey where key = ....
end of loop
Intention is to resort the datarows. So I made two updates to every keyvalue in a very short time. At the ConflictViewer I got messages like:
"The row was inserted at 'ServerX' but could not be inserted at 'ServerY'. Violation of PRIMARY KEY constraint 'PK_xxxx. Cannot insert duplicate key in object 'ReplTable'. "
The replication did only deliver one (the last) update - this makes the violation. Is there a possibility to make the mergeagent known that I wanted to deliver every transaction? Is there a parameter in the agents profile?
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Apr 5, 2006
Hey guys,I have to import a csv file to my database and then add
some values to other fields based on these values. At present I use a
store procedure that does a bulk insert and then I use an update and
fetch inside the sql to perform these updates. I am not sure if this is
the best way. Is this bad, since some amount of busniess logic is in
the store procedure?If it is, how can I do this better?Thanks for the answer.
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May 21, 2008
I am working with stored procedures to provide conditional business logic for a customer based on triggers. Is it possible for a stored procedure to execute an external program ie opening or distributing a crystal report?
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Dec 4, 2014
I have a database with enabling merge replication.
Then the problem is update query is taking more time.
But when I disable the merge triggers then it'll update quickly.
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Mar 16, 2007
I guess I just don't get the reasoning behind the new SqlDataSource control. Haven't we just spent the last decade or so evangelizing and learning how and why to separate business logic from the display in VB 6 and VS.NET? In this age of programming for disparate devices (desktop, mobile, PocketPC, etc.) when this separation makes more sense than ever, why is MS pushing us to go back to putting our logic and data access rules and objects back in the display? It doesn't make sense. Why would anyone do this? And why would all the experts and MVPs at ASP.NET, DevX, 4GuysFromRolla, etc., go along with this?
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May 27, 2015
ALTER TABLE [dbo].[bkrm_lendcoll] ADD CONSTRAINT
   ReqdCovgAmt_constraint33 CHECK   Â
( caseÂ
 when CovgAmt = 0 and  ReqdCovgAmt = 0 then 1
 when CovgAmt = 0 and  ReqdCovgAmt = 1 then 1
 when CovgAmt = 1 and  ReqdCovgAmt = 0 then 1
 when CovgAmt = 1 and  ReqdCovgAmt = 1 then 0
end =1
)
This is my first attempt to add a constraint for business logic. Â The desired behavior is that the two columns together have the same behavior as a radio button. Â (one can be true, the other true, both can be false, but both cannot be true.) I get this error when I attempt to update it.
The ALTER TABLE statement conflicted with the CHECK constraint "ReqdCovgAmt_constraint33". The conflict occurred in database "Std", table "dbo.lendcoll".
So, basically my question is, when you have two bit columns and want them to have the truth table such as described, how can I set a Check constraint to enforce this?
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Oct 30, 2006
I have a merge replication topology that allows some subscribers (clients) to retreive a number for certain columns (ie invoice number, order number, etc).
I have implemented a custom business logic handler to check for inserts from the subscriber and before updating the server, I call a stored proc on the server to generate a new number. I update the data set and call ActionOnDataChange.AcceptCustomData. This works great for the publication db but I am trying to get this new number back into the subscription db. I am using web synchronization so I really don't have a connection back to the subscriber database.
Any Ideas? I was thinking about keeping track of the updates myself and build a sql string and somehow get that back to the subscriber to run updates for those columns... I am wondering if I am pushing the limits of the business logic handler? Was it designed to do this? Of course the easy answer is to modify my client application but I am trying to avoid that at this point.
Any help/suggestions would be greatly appreciated!
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Dec 3, 2014
I have a database with enabling merge replication.
Then the problem is update query is taking more time.But when I disable the merge triggers then it'll update quickly.
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May 13, 2006
Hi ,
I am trying to create Replication Topology (Merge Replication) like below.
Subscriber1 --> Publisher <-- Subscriber2.
I have created both subscribers with Subscription Type as Server with Priority as 75. I am updating the Column A of Row_10 in Subscriber1 on time say 11 am. After i am running the Starting synchronizing agent from Subscriber1. The value propagated to Publisher now publisher contains the latest value in Column A. Uptonow the Subscriber2 is not synchronized with Publisher.
Now in Subscriber2 also Column A of Row_10 is updated say at 11.10 am. Actually now Publisher contains the value from Subscriber1 for that Column and in Subscriber2 we have the same column updated.
Now i am running the Synchronization in Subscriber2, i am getting the result which is not expected. Here Publisher's value is propagated to Subscriber2. But as per real scenario Subscriber2 has the Latest value which is updated on 11.10 AM.
I don't know what am i missing here. Actually merge replication should see the time stamp and it has to decide winner. But here it always considers publisher as a winner and puts the data to Subscriber.
Can anyone help ?
Thanks in advance
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Jul 20, 2005
Hello,I stuck in a delimma.Where to put the business logic that involves only one updatebut N number of selects from N tables........with N where conditions
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Dec 8, 2006
Suppose your using Merge Replication.
2 Users in 2 locations issue updates to the same table. 1 updating 1 column and the other updating another column. Now in reality the actual Stored Procedure issuing the update statement is passed in all the possible columns that could change and builds an update statement that updates all columns even the ones that havent changed.
Will this break Merge Replications conflict tracking? Or does SQL Server 2005 Merge Replication pickup that in reality the 2 updates only in reality changed the values in 2 columns.
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Jul 20, 2005
What is the way we could implement a business logic from a Table bystoring it statemnnets in a colums and defining an execute sql toexecute it.Some legal requirements make it diffcult for us to createmodify stored procdures so Iwant to have a process where we create newrows in a table and execute it to execute business logic.All views are welcome.Havin g one table two tables different approaches to store ststementsand execute them....Case logic how to implement it?Flags in the tble colums in the tablesetcThanksAjay Garg
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Jul 4, 2007
Hi there,
We have a big problem here with merge replication, specifically whenever a schema change occurs. We are replicating schema changes, and triggers/stored procedures. The example is that we changed about 150 stored procedures and about 30 triggers. This is then replicated to the subscriber database (which is also a merge publisher for further remote systems that were offline at the time) over a 10Mb link - hardly low bandwidth. However, the replication process takes about an hour and a half - considering the SQL on the primary server took less than a minute to run this is a big suprise.
We've run a trace to see if we can identitfy what is going on. There seems to be a great number of calls to sp_MSunmarkschemaobject - we are still waiting for a trace to complete to fully analyse this however it looks like it calls this repeatedly for every stored procedure in the database. We are currently re-testing to one of the remote servers with the merge agent set to the slow profile (not much hope that this will alter the poor performance).
This task looks to be excessive - and certainly does not seem to function in a sensible manner. Has anyone else had similar issues or have any suggestions. This is very infuriating as it means that the servers are effectively offline for a minimum of and hour and a half (in fact the remoter servers take over 4 hours !).
Thanks.
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Apr 20, 2015
In order to feed a fact table of a dwh from a staging table I'm using the MERGE statement in order to control insert and update operations. It is possible that the staging table has duplicate rows respect to the fields controlled in the merge condition:
When I run the first time the MERGE statement unwanted rows could be inserted in the fact table.
Does the MERGE statement allow to manage this case or do I need to filter data from the staging table before to write them into the fact table?
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Nov 8, 2004
Posts: 20
Joined: Aug 2003
Mon November 08, 2004 9:42 AM
I have a table where from 1 to 3 fields will be update (lastname,firstname,birthdate). Any combination of the 3 can be updated. I need a trigger to handle the updates which update some other db tables. I can handle the update trigger part, the ? is how to best approach the logic. I can do thee separate statements to handle an update for each of the columns, but that could cause 3 separate updates to fire. I was looking at doing something like
If UPDATE(last_name)
and UPDATE(first_name)
and update(date_of_birth)
BEGIN
...
end
else if
If UPDATE(last_name)
and UPDATE(first_name)
begin
...
end
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Jan 25, 2006
I am dealing with two tables and I am trying to take one column from a table and match the records with another table and append the data of that column.
I used an update query that looks like this:
UPDATE Acct_table Set Acct_table.Score =
(Select Score_tbl.Score from Score_tbl
Where Acct_table.Acctnb = Score_tbl.Acctnb
This process has been running for over an hour and a half and is building a large log file. I am curious to know if there is a better command that I can use in order to join the tables and then just drop the column from one to the other. Both tables are indexed on Acctnb.
Any insight would truly help.
Thanks!
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Feb 5, 2008
Hi,
I am facing a small problem while updating the warehouse using SSIS package.
Here is an sample scenario.
I have a staging table T1 with some important columns as stateid,ename etc ..
and target table as Trg with only two columns stateid and statecnt.
The Rule is, each state will be sending an excel file which basically contains state and employees belonging to the state information.
For the first time when i execute the SSIS package, i need to load statetid and count_of_employees for that particular state.
say for example.
SELECT stateid,
count(ename)
from T1
where stateid = ?
For the next time if the same state information is received then we need to update the count to the existing record in the Dataware house rather than creating a brand new record once again.
I am little bit confused of implementig this logic.
Can anyone help me out in accomplishing this task.
What can done or what steps is involved in achiving the task.
Thanks in advance.
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May 9, 2008
Hi guys
We have a table X with a gender column taking values M(male) or F(Female).There are 52 rows in the table X.We want to update all the rows with Gender M as F and update all remaining F as males (M) in a single Update Query.Im looking for the exact logic we would write in the single update statement.
Please help me out.
Thanks in advance
Regards
ARvind L
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May 1, 2006
I have a stored procedure that I need to either perform an update if a record exists or an insert if the record doesn't exist.
Here is my procedure:
CREATE PROCEDURE dbo.Insert_Temp_ContactInfo
@sessionid varchar(50),
@FirstName varchar(50),
@LastName varchar(50),
@SchoolName varchar(50),
@address varchar(50),
@City varchar(50),
@State int,
@Zip varchar(5),
@Phone varchar(10),
@Email varchar(50),
@CurrentCustomer varchar(3),
@ImplementationType int,
@ProductType int = null,
@Comment varchar(500)
AS
--check if a current record exists
SET NOCOUNT ON
SELECT FirstName, LastName, SchoolName, Address, City, State, Zip, Phone, Email, CurrentCustomer, ImplementationType, ProductType, Comment
FROM dbo.Temp_ContactInfo
WHERE sessionid = @sessionid
SET NOCOUNT OFF
--if exists update the record
UPDATE dbo.Temp_ContactInfo
SET
FirstName = @FirstName,
LastName = @LastName,
SchoolName = @SchoolName,
Address = @address,
City = @City,
State = @State,
Zip = @Zip,
Phone = @Phone,
Email = @Email,
CurrentCustomer = @CurrentCustomer,
ImplementationType = @ImplementationType,
ProductType = @ProductType,
Comment = @Comment
WHERE sessionid = @sessionid
--if the record does not exist, then insert a new record
INSERT INTO dbo.Temp_ContactInfo (sessionid, FirstName, LastName, SchoolName, address, City, State, Zip, Phone, Email, CurrentCustomer, ImplementationType, ProductType, Comment)
VALUES (@sessionid, @FirstName, @LastName, @SchoolName, @address, @City, @State, @Zip, @Phone, @Email, @CurrentCustomer, @ImplementationType, @ProductType, @Comment)
GO
I think I can use an if statement. Can anyone help me out with this?
Thanks.
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Nov 8, 2006
hi.I am having probelms with an update statement. every timei run it, "every" row updates, not just the one(s) intended.so, here is what i have. i have tried this with both AND and ORand neither seem to work.i dont know why this is elluding me, but i'd appreciate help with thesolution.thanks.UPDATE addSET add_s = 1WHERE add.add_status = 0 and add.add_email = 'mags23@rice.edu'or add_s in(SELECT a.add_sFROM add a, edit eWHERE a.email_address = e.email_addressand e.public_name = 'professor')
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May 26, 2015
What is the main difference between snapshot and transactional and merge replication?
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May 14, 2008
please need rescue- complex update logic
this is my table
1
2
3
4
5
EMPID
fld1
fld11
fld111
fld2
fld22
fld222
fld3
fld33
fld4
fld44
fld444
fld5
fld55
fld555
1111
A
B
C
7
8
9
G
H
I
J
K
L
M
N
2222
N
M
L
K
J
I
H
G
F
E
D
C
B
A
3333
1
2
3
A
B
C
C
E
Y
I
O
W
Y
P
i need to update for example the eployee 1111 with employee 3333
but with swap ( take the value of employee 1111 in field- fld2,fld22,fld222 and swap value between employee 3333
in field- fld2,fld22,fld222 )
Code Snippet
---update eployee 1111 with employee 3333
-so
if i put the value 2
than ------------------ swap value between 2 employee
set empid1= 1111
set empid2=3333
value_swap=2
if value_swap=2
than
update fld2,fld22,fld222
with fld2,fld22,fld222
------------------- take the value of employee 1111 in field- fld2,fld22,fld222 and swap value between employee 3333
--------------------in field- fld2,fld22,fld222
value_swap
=1
=2
=3
=4
=5
EMPID
fld1
fld11
fld111
fld2
fld22
fld222
fld3
fld33
fld4
fld44
fld444
fld5
fld55
fld555
1111
A
B
C
A
B
C
G
H
I
J
K
L
M
N
2222
N
M
L
K
J
I
H
G
F
E
D
C
B
A
3333
1
2
3
7
8
9
C
E
Y
I
O
W
Y
P
Code Snippet
---update eployee 2222 with employee 1111
-so
if i put the value 5
than ------------------ swap value between 2 employees
set empid1= 1111
set empid2=2222
value_swap=5
if value_swap=5
than
update fld5,fld55,fld555
with fld5,fld55,fld555
------------------- take the value of employee 1111 in field- fld5,fld55,fld555 and swap value between employee 3333
--------------------in field- fld5,fld55,fld555
=1
=2
=3
=4
=5
EMPID
fld1
fld11
fld111
fld2
fld22
fld222
fld3
fld33
fld4
fld44
fld444
fld5
fld55
fld555
1111
A
B
C
7
8
9
G
H
I
J
K
W
Y
P
2222
N
M
L
K
J
I
H
G
F
E
D
C
B
A
3333
1
2
3
A
B
C
C
E
Y
I
O
L
M
N
TNX FOR ALL THE HELP I GET IN THIS Forum
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Sep 5, 2007
I am interested for tips/pointers on Remote Data replication using SQL 2005. Let's say there are 2 sites (A and B). I plan to have site A comprised of 2 SQL servers (1 active and 1 on standby). Site B will have the same configuration. If site A becomes disasterous then Site B will come up with zero loss of data or minimal loss of data. Will SQL data replication provide solution? or I need to look at other methods. By the way, both sites have servers attached to SAN storage. Thanks in advance;
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