Update Query Is Slow With Merge Replication?
Dec 4, 2014I 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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SQL 2012 :: Update Query Is Slow With Merge Replication?
Dec 3, 2014I 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.
Problem : Extreme Activity - Slow Merge Replication - From A Schema Update
Jul 4, 2007Hi 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.
Merge Replication && Update On Keys
Feb 21, 2006Hi, 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?
How To Create Merge Replication With Latest Update Always From Subscribers
May 13, 2006Hi ,
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
Merge Replication β Bug In Business Logic Update Handler
Nov 17, 2006I 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
Does The Actual Update Statement Of A Table Affect Merge Replication?
Dec 8, 2006Suppose 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.
Update Query Running Very Slow
Apr 17, 2008Hi all,
I'm having what you might call an optimisation issue - but I'm also not sure if my approach to this problem is right. I've spent the whole day trying various methods but none seem to be performing as admirably as I'd hoped.
Basically, here's the scenario:
1. Log files are being inserted into a SQL table via Log Parser 2.2.
2. I have a lookup table of ip address ranges to countries and other geographic data.
3. Once the log row has been inserted from Log Parser, I want to update the same log table with data from the lookup table.
The main problem seems to be the updating (the initial insert from Log Parser is lightning quick).
I initially wrote a trigger on AFTER INSERT on the log table that converted the actual user's IP address into IPNumber format using a simple algorithm, then pumped the IPNumber into a quick select query which retrieved the geolocation data. Then, in the same trigger, there was an update statement which basically said:
update dbo.Logs
set [Country] = @Country
where [IpNumber] = @IpNumber and [Country] = Null
Therein lies the problem. The update statement slows everything down to almost a standstill and also seems to obtain a lock on the table.
Critical factors:
1. The log table must remain readable.
2. The query must execute in seconds -- not over half hour :)
I've experimented with various combinations of indexing, so far to no avail.
Any suggestions would be very much appreciated.
Regards
Very Slow Running Update Query Query
Nov 19, 2004I have an update query running which to just now has been running for 22 hours running on two tables 1 a lookuptable that has just been created within the batch the other a denormalised table for doing data analysis on
the query thats causing teh problem is
--//////////////////////////////////// this is the one thats running
Print 'Update Provider 04-05 EmAdmsCount12mths : ' + CAST(GETDATE() AS varchar)
GO
Update Provider_APC_2004_05
set EmAdmsCount12mths =
(Select COUNT(*)-1
from Combined_Admissions
where ((Combined_Admissions.NHSNumber = Provider_APC_2004_05.NHSNumber) or
(Combined_Admissions.PASNUMBER = Provider_APC_2004_05.PDDISTNO)) and
(Combined_Admissions.AdmDate BETWEEN DateAdd(yyyy,-1,Provider_APC_2004_05.AdmDate) AND Provider_APC_2004_05.AdmDate) AND
Combined_Admissions.AdmMethod like 'Emergency%')-- and
-- CA.NHSorPrivate = 'NHS'))
FROM Provider_APC_2004_05, Combined_Admissions
any help in improving speed would be most welcome as there are 3 more of these updates to run right after this one and the analysis tables are almost double the size of this one
Dave
Replication :: Difference Between Snapshot And Transaction And Merge Replication?
May 26, 2015What is the main difference between snapshot and transactional and merge replication?
View 5 Replies View RelatedHow Do We Add A New Column To A Merge Replication Article, But Specify It As Not For Replication?
Aug 30, 2007Hi all,
I know that adding a column using ALTER TABLE to add a column automatically allows SQLSERVER 2005 to replicate the schema changes to the subscribers, however, I would like to add a new column to an existing article that is being used for merge replication, however, I don't want this column to be replicated. Re-initialising the subscriptions is not a option. Help would be appreciated.
I am using SQLSERVER 2005 (SP1).
Seperate Date And Time Merge; Done At SQL Update Or C# .NET Then Update
Feb 18, 2006I do realize that his could be posted in a few spots but I think the answer is in the SQL.
I have a ASP.NET page, with a SqlDataSource, Text Box and Calendar Controls. I have the textbox and calendar controls eval'ed to the same sql data source DateTime Field. The text box is formatted eval to small time and the calendars eval has no formatting.
ex:
<asp:TextBox ID="START_TIME" Text='<%# Eval("EVENT_START","{0:t}") %>' runat=server Width=200></asp:TextBox>
I want to merge the two controls; one has the date the other has the time when I update the pages data to the SqlDataSource field EVENT_START. I've tried a couple of methods, but I would like some other opinions. As Sql server only supports date and time together I am storing the two together.
I could merge the two together in the code behind on the update button's event handler or merge the two during the update query using parameters.
Not that I could get an illegal date for the calendar control, but I could get garbage from the textfield time. So I still would have to do validation on the text field before the SQL server could do the update.
There's a few ways to go about this, so I was wondering if anyone else has figured out an elegant way to handle it.
wbochar
Merge Replication Set Off Transactional Replication
Oct 9, 2007I am working on bringing our disaster recovery site to be a live site. Currently we replicate to one of out servers (server B) with merge replication (from server A). Server A also does one way transactional replication form some table to several other servers including servers at the DR site.
This setup is not going to be fast enough for what we need so I am wondering if a table is receiving merge replication will the merge updates also replicate down the transaction path??
Example...
Server B update a row and merges to Server A. With this update them replicate (via transactional) to Server C??
thanks...
Replication Is Very Slow
Dec 27, 2006When we try to replicate the database from one server to another server it is very very slow...
Then we assumed that the Indexed View may cause this issue.. But we didn't check by removing the index & replicated it..
Can any one suggest me for the following Qs..
Is it Indexed View really bad on Replication(Main Table)?
What is the alternate & best solution for Indexed Views?
Is Covered Index solve the Indexed View issue?
Is Convered Index wont create the Replication issue?
Is it good idea to disable the Index on View on Replication and re-create the index?
Pls guide me on this issue..
We are Using SQL SERVER 2000 Enterprise Edition
Slow Update
Jan 18, 1999UPDATE TABLE SET FIELD1=NULL WHERE FIELD2=something - is running veryvery slow. Table has 200 000 recors and on FIELD2 is index.
If number of records to be updated is about 40 000, it takes about 3-4 hours.
I tried this:
- create a new MSSQL DB.
- migration of TABLE from original databes to new test DB
- So, in new DB was only one table, with 200 000 records. Index was only on FIELD2.
- I ran that update and it takes about 3-4 hours
I tried that on Interbase and update takes under ONE SECOND!!!!!!!
Thanks for some notices
Slow & Complicated Update
Mar 22, 1999I have the following stored procedure that I use for an update. The table now has just over two million rows and the stored procedure takes days to run. I am looking for any help that would produce the same results faster. This runs on SQL Server 6.5, on an NT machine with 4 pentium pro 200 processors and 512 MB of RAM so I am relatively sure that the performance issue is in the below statement.
UPDATE PAY_CHECK_DETAILS
SET JobID = j.JobID
,HROrganizationID = j.HROrganizationID
,JobDetailID = j.JobDetailID
,GLAccountNumber = j.GLAccountNumber
FROM JOBS j, PAY_CHECK_DETAILS p
WHERE j.EmployeeID = p.EmployeeID
AND j.HRActionEffectiveDate =
(SELECT max(HRActionEffectiveDate)
FROM JOBS jj
WHERE p.EmployeeID = jj.EmployeeID
AND jj.HRActionEffectiveDate <= p.PayDate)
AND j.HRActionSequence =
(SELECT max(HRActionSequence)
FROM JOBS jjj
WHERE p.EmployeeID = jjj.EmployeeID
AND jjj.HRActionEffectiveDate =
(SELECT max(HRActionEffectiveDate)
FROM JOBS jjjj
WHERE p.EmployeeID = jjjj.EmployeeID
AND jjjj.HRActionEffectiveDate <= p.PayDate))
AND NOT (ISNULL(p.JobID,1) = ISNULL(j.JobID,1)
AND ISNULL(p.HROrganizationID,'A') = ISNULL(j.HROrganizationID,'A')
AND ISNULL(p.JobDetailID,1) = ISNULL(j.JobDetailID,1)
AND ISNULL(p.GLAccountNumber,'A') = ISNULL(j.GLAccountNumber,'A'))
Thanks for any help or suggestions you have.
Keith
Slow Database Update
Nov 23, 2007I have designed a 22 table database in sql server that is to act as a backup/alternate access to the data we have stored in an ADABAS database. I've also written a vb.net console program that will take data from ADABAS through a broker connection (one row at a time), checks the sql server database to see if that information is already stored, and then either performs an insert or an update.
I can write the rows from ADABAS to a text file (not using the broker), at the rate of about 1.3 million rows in 1.3 hours. Data can be imported (I'm not sure how this import is done, possibly via a CSV file. SELECTS/UPDATES are not done, just INSERTS) at about 1 million or so an hour. But when I do the update, receiving information via the broker from ADABAS to the VB program (with it's SELECT, then UPDATE/INSERT), I'm only doing about 20-25 thousand rows an hour.
I ran a trace using the SQL Server Analyzer on the database while running the update program, and then ran Profiler using the generated workload. It created a few indices, but I just restarted the update program (I'm still developing, so I delete all rows from all tables each time I rerun the update), but I haven't seen that it's really any faster.
I have a rather large set of data to transfer over, and this 20-25 thousand row time is not nearly fast enough.
Any help will be appreciated.
Thanks,
Slow Sql Update MS SQL 2000
Jul 20, 2005I have the following statement that takes quite a long time. Longestof any of my SQL statment updates.UPDATE F_REGISTRATION_STD_SESSIONSET PREVIOUS_YEAR_SESSION_ID = (SELECT s.previous_year_session_idFROM F_REGISTRATION_STD_SESSION R,DS_V4_TARGET.dbo.D_H_Session_By_SessQtr SWHEREr.STUDENT_ID = F_REGISTRATION_STD_SESSION.STUDENT_IDand s.previous_year_SESSION_ID = r.SESSION_IDand s.session_id = F_REGISTRATION_STD_SESSION.SESSION_ID)STUDENT_ID varchar(20) and SESSION_ID char(10) and are indexedWhat I want to accomplish:I want to know if there was a student registration from the prior yearof a registration.Example, if there is a registration for Fall 2004, was there also aregistration for the same student Fall 2003?Maybe there is a better way to approach this?TIARob
View 10 Replies View RelatedInsert/Update Too Slow
Sep 9, 2007Hi,
I have a table with 110 nvarchar (255) columns in the database. I receive the data from the server (array) and them loop through it to insert the data into the database. The problem is it takes more than 3 minutes to insert (or update) (in memory) the 310 records it got from the array. I am reusing the Statement (with parameters). How could I improve the performance?
It's really a small quantity of data, the CPU in the device is 520Mhz... it should be alright!
Can aynone help me please?
Thanks
One Way Merge Replication
Feb 14, 2002Hi everbody,
I setup the Merge Replication , it is working perfectly. But i have one problem now it is updating both ways. I nedd one way. Any body tell me which parameter i have to change.
Thanks in advance
Merge Replication
Aug 12, 2002Hi,
My production box is running on NT4.0,SP6, SQL Server7.0,SP2. We implemented Merge replication. Working fine last 7 months. Last weekend i disabled replication, Successfully removed Distributor and Publishor. After that try add new fileds but won't allowed me. It's give the error message. I Also found Some Conflict_tables found almost 20 tables. All system Tables. Can delete these these tables, if i delete any problem my database.
I added filelds many times but this time i got errors.
Please help me anybody.
Merge Replication
Jul 31, 2000I have just installed replication on our production server to Merge Replicate with a Laptop server that will travel from time to time. I have now noticed that we cannot add or change any fields or attributes on the tables which are being replicated (which are all tables in the DB). This is a problem because we are changing and adding columns all of the time. Is there a way around this issue like shutting down the replication service or something? I have been unsuccessful in finding a way around this other than removing replication while we make changes.
Thank you in advance for any help!
Merge Replication
Jan 22, 2001I have implemented a Merger replication on our development server and I get a fillowing error when I try to update one of the table in publisher.
"Transaction cannot start while in firehose mode"
What does this mean.
Thank You,
John
Merge Replication
Dec 19, 2000Hi,
I read some where that replication has two types conflict resolution, 1. row based and 2. Column based...
If I am right...
Can any one point me how to find out this option and how to set it up....
Thanks,
Mohammed.
Merge Replication
Sep 16, 1999Hi all,
I have a merge replication going between 4 servers. The problem is when ever I do some BCP transfer to one of the tables in one of the servers. It puts the data in that table. But that Data does not get replicated to any other server like it should.
Please Advice on what to do. Is there any option I am forgetting to set or something.
Thank you for all your time in advance.
Aziz
Merge Replication
Sep 12, 2003I have successfully tried merge replication on single server with 2 databases.
now i want to do the same with different servers,
when i create pull subcription on server 2 which user account should I use?
it is giving log in failure
i tried using windows admin account and also the 'sa' account.
please help me out
thanks
Merge Replication (Again)
Feb 23, 2004Hi All,
I have posted this earlier and I am re-posting it simplifying what I had said.
The scenario is:
I have two sql server database instances with the same database schema and all. However, both of them have different data. I have not set them for replication at all. Now, I want to do merge replication between them such that the data between them could be syncronized.
When I do pull merge subscription I have two choices -
1.Bringing schema and data to subscriber from publisher
2.Not bringing the schema and data from publisher to subscriber.
Obviously, I chose the second choice. But upon syncronizing I dont see any data from publisher coming to subscriber and vice-versa. If I add new data to publisher and do syncronization, I can see ONLY the new data created after the replication setup in subscriber. If I add new data to subscriber and do syncronization then the new data is removed from subscriber and not propagated to publisher.
Is there any way I can make this work??
Niben
Merge Replication
Jan 2, 2007Hi,
I have just set up Merge replication, I have two servers, server A and server B, the merge replication worked successfully but I don't quite sure which databases should or should not replicated? If not, what other methods should I use?
I would really appreciated any comments or advice out there!
-whitebelt
Merge Replication
Mar 21, 2002I had set up merge replication. I got these error messages where replications starts "Column names in each table must be unique. Column name 'PubID' in table 'bonflict_DBName_PHP_Data_Publications' is specified more than once "
PHP_Data_Publications table defind as:
CREATE TABLE [dbo].[PHP_Data_Publications] (
[PHP_Pub_ID] [uniqueidentifier] NOT NULL ,
[PHP_Data_ID] [uniqueidentifier] NOT NULL ,
[PubID] [uniqueidentifier] NOT NULL ,
[UserID] [uniqueidentifier] NOT NULL ,
[Username] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Publication] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Pub_Year] [datetime] NULL ,
[Pub_Name] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[rowguid] uniqueidentifier ROWGUIDCOL NOT NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[PHP_Data_Publications] WITH NOCHECK ADD
CONSTRAINT [DF__PHP_Data___rowgu__01E91FA0] DEFAULT (newid()) FOR [rowguid]
GO
CREATE UNIQUE INDEX [index_1466488303] ON [dbo].[PHP_Data_Publications]([rowguid]) ON [PRIMARY]
GO
Thanks,
Chanthol
Merge Replication ???
Oct 11, 2001Hi
Is it possible to modify or add new fields in sql 2000 when the instance
became publisher ? I tried it several times but it failed. I access microsoft website but i did not help.
Thanks
Pheckz
One Way Merge Replication
Oct 12, 2001Hi everbody,
Anybody tell me about implementation of oneway merge replication.
Thanks
One Way Merge Replication
Feb 5, 2001Hi everyone
SQL Server BOL says merge replication can be done in only one direction. But my understanding is Merge replication happens in both ways between publisher and subscriber.
How can i allow data movement from only wince sql ce subscribers and not from publisher running sql 2000 and win 2k.
Please reply immediately bcoz i require a solution which has to be implemented very soon.
Thanks in advance
Satheesh
Merge Replication
Jun 29, 2004hi,
in merge replication,i make a request subscriber with a priority 25.00,when i update the same date,it always choose the update from the publishing server,why????how does it work???
thx inadvance