Data Replication
Jan 24, 2007
I have 3 databases which i will reference as Database1, Database2 and Database3.
Database1 and Database2 are running SQL SERVER 2000
Database3 is running SQL SERVER 2005
Database1 and Database2 each have a Member Info table containing login information for seperate websites.
Database3 has a Member Info table also, but the login information is populated from the Member Info tables in Database1 and Database2.
Curently this is achieved by running a job once a day that clears out the Member Info table on Database3, and then running two insert statements that take the data from Database1's Member Info table and Database2's Member Info table and insert it into Database3's Member Info table.
This all works fine, but I don't think it is the best way to do this. Also, doing it this way leaves the chance that the job might hang up and then the Database3's Member Info table will be empty.
I am trying to find if there is a more efficient way to do this. And any ideas are appreciated!!!
In idea i thought about trying is to populate the Database3's Member Info table, and then place triggers on Database1 and Database2's Member Info tables. If a row is created/updated/deleted in Database1 or Database2's Member info table, it could take that information and update the corresponding information in Database3's Member Info table. But I have never really messed with triggers, so this may not be possible.....
Another idea I though of is to run a job once a day, but then have a cursor that goes through each row in Database1 and Database2's Member Info table, and if the information is not found in Database3's Member Info table, it could then either create/update/ delete that info.
Just wanted some opinions/ideas before I tackle this.
Hope this wasn't too confusing...
And Thank you in advance!!!
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Jul 28, 2006
Hi,
I have a VB.net app that access a SQL Express database. I have transactional repliaction set up on a SQL 2000 database (the publisher) and a pull subscription from the VB.net app. I use RMO in the VB app to connect to the publisher. My problem is I am getting some strange behaviour as follows
- if I run the app and invoke the pull subscription it works fine. If I then close my app and go back in, I can access my data without any problem
- If I run the app and try to access data in my SQL Express database it works fine. I can then close the app, reopen it and run the pull subscription it works fine
however.......
- if I run the app, invoke the pull subscription (which runs fine), and then try to access data in my local SQL Express database without firstly closing and reopening the app, I get a login error
- if I run the app, try to access data in my local SQL Express database (which works fine), and then try to run the pull subscription I get a "the process cannot acces the file as it is being used by another process" error. In this case I need to restart the SQL Express service to be able to run replication again.
I get exactly the same behaviour when I use the Windows Sync tool (with my app open at the same time) instead of my RMO code to replicate the data.
I am using standard ADO.Net 2 code to access my SQL Express data in the app and closing all connections etc
Any advice appreciated !
Thanks
Ronan
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Nov 17, 2006
Hi,
I am trying to setup Trans Replication with updating subscriber on sql2000. One column on few tables got data with single quote (').
How do I handle in this case? Did any one come across such case?
Can I Change default QUOTED IDENTIFIER from ' (single quote) to something else (@@@) on SQL2000?
If yes, how to do?
Thanks
mka
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Oct 26, 2007
Guys,
I have 14 databases, the last database - 14th one will have lookup tables only. The other 13 databases will have these lookup tables and data tables. At the end of each day I will make updates for lookup tables on 14th database, I want to be able to push the updates to any or some of the 13 databases. Look up tables will have only upto 100 rows, so I am not concerned about the bandwidth. What is the best way to accomplish this.
Any suggestions and inputs would help
Thanks
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Jan 29, 2007
Hi all,
Where is the replication log will be stored.My replication is failed due to server down.I have setup as a transaction replication. I just want to know where that log will be availbale.
thanks
krishnakumar
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Aug 31, 2007
Hi,
What is the best way to do a two way data transfer between Sql server 2005 and sql server 2000. These data transfer should take place on triggers happening on either of these databases. Please help. Is there any tutorial online which addresses this.
Thank You
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Feb 28, 2005
Hi,
I have two sets of data i.e two instances of SQL server in two different cities. Data entry happens at both the places.I need to balance the data in two servers i.e. I need to Synchronize the data.
Currently I am Exchanging the data between two sides and using a Buffer database to update the incremental infromation.(Running a SQL script).
I have GUID columns in my database. I am too new to replication.I wanted to know whether I can implement repliaction and what changes i need to make?(e.g. Replacing GUID columns with Identity columns).
Permanent connectivity between two databases is required or Replication can be performed whenever connected?
Best Regards
Rohit
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Mar 9, 2007
What tools are available to update SQL Server application tables from a DB2 database?
The DB2 database is on iSeries (AS/400).
Thanks in advance.
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Feb 10, 2007
Hy im PCV
I want to know how to calculate the amount of data(in MB) that is transfered from 1 server trought another
Puplisher--->Subscriber, using a merge replication. I know that the amount of data depends on the number of the rows and the scale of the colums. I only want to know how to calculate that amount of data. I am using Sql server 2000, and a OS windows XP profesional, thank you
PCV
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Jul 20, 2005
I'm seearching for information regarding database replicationperformance. We need to compare the performance of replication for SQLServer and Oracle and it is urgent! Anyone who can describe theperformance bottlenecks for each database when performing replication,or can point me to a white paper or webpage.
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Feb 7, 2007
We are looking at setting up peer-to-peer transactional replication between two databases. We have a customer requirement to encrypt the SSN in this database. I have configured replication successfully. I have also successfully encrypted the SSN using a symmetric key (with encryption by certificate). What I haven't done yet is set up encryption to work across a replication topology.
What steps would I have to follow in order to be able to encrypt the SSN on one server, replicate it to the subscriber, and then decrypt the SSN on the subscriber? For this scenario, is there a better way to handle encryption other than a symmetric key encrypted by a certificate?
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Aug 8, 2007
I am looking for an opinion on the best way to delete all data from a table after it has been replicated.
The simple use case would be:
Data is replicated from production server to archive server.
Data is deleted from production serverThanks in advance...
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Dec 6, 2006
hi,
Im using merge replication.I have created one publisher with dynamic filtering and i have creted two subscribers from it(pull subscription).It was working fine.but after sysnchronizing 2-3 times data from some tables went missing
can any one help me....
thanks and regards
Dhanya
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Jan 31, 2007
1. I want to create a (transactional) NEW Publication and a NEW Subscription, but the Suscriber contains data inside the tables (articles) at the beginning (data from another year). Is this possible? How?.
2. I have a transactional Publication a Subscription running correctly. For X, the data in the Suscriber is deleted. I want to send ALL the data from de Publication. Must I delete the publication an create again for do this? Is the only way that we found but we think that is possible reinitialize or something like this.
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Dec 23, 2004
I have 3 SQL databases: A, B and C. A and B are branch databases while C is the central (HQ) database. A & B will be constantly updated while C will updated occasionally and usually will be used for reporting/data browsing. Even though A & B are from different branch, they do have share some data records.
Every day, I will have to sync A & B's new/updated data to C and C to A/B. I know I can use Replication but I can't. You see, A & B are located in our own branch server while C was hosted on a third-party server. The webserver provider for C would not allow me to do any Replication on C.
What other alternatives that I can use to synchronise all 3?
DTS? XML transfer? It looks as if I have no choice but to write my own sync scripts? :((
Anyone has encountered similar situations? Any recommended SQL Tool programs?
Please help. I'm at a loss of what Im going to do.
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May 3, 2002
Hello everyone,
I'm running merge replication with several databases. So far everything worked fine, but now I tried to insert some new records and I get the message:
Server: Msg 7139, Level 16, State 1, Line 1
Length of text, ntext, or image data (73728) to be replicated exceeds configured maximum 65536.
The statement has been terminated.
Can anybody tell me how if I can change this max. value and how ?
Thanks a lot
Mike B.
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Apr 21, 1999
I need to transfert data between two servers without replication, and using a stored procedure . Any Ideas. Thanks.
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Sep 1, 2004
Hi All,
I am new to MSSQL Server 2000. I am sorry if you think that this is silly question.
What is the difference between identity – yes and yes(not for replication)
What are two different situations where I should use identity – yes or identity - yes(not for replication)
Thanks in advance
rainbow11
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Jan 4, 2005
We have a database on the live server which powers a website. Then our client has a copy of the database at their office. Their is Merge replication set up between the two running every half a hour.
Now they want to be able to look at the merge replication history.
With my little knowledge, I believe that the place to get this data from is the distribution database on the publishing machine which is the live server. Now for obvious reasons we cannot replicate the
distrubution database to their side so we need to come up with some way of giving them the data. They also want a history of replication.
So the way I was thinking of fixing it was to have a job that copies some of the last days data from the distrubution database onto the main database and add that table to the replication so they got it every day. Also writing a ASP page so they can look at the last days
data straight from the distrubution database.
Here are my questions:
Question 1:
How long does the replication store history for?
Question 2:
Is thier any simpler way of allowing them to see the replication history?
Question 3:
Are their any other things I should be worried about?
Thanks for any feedback, Nixies
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Apr 12, 2007
I need to move my database servers from one location to another. The issue is that I have over 200 databases to move and my clients can't afford a downtime. The collective volume of all the databases is over 2.5 TB and growing.
I am thinking to copy these databases in batches over the WAN to the new location and replicate them using Transactional replication till I have all the databases moved and synchronized.
Will it be wise enough to use replication for synchronizing 200 databases or is there a better approach which I can use to move these databases with minimum downtime and compromise on performance of applications.
Note: Migration is from SQL Server 2000 to SQL Server 2005.
Thanks in advance.
Ritesh
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Jan 8, 2004
Hi,
Ive got a server which replicates an awful lot of constantly changing data - the db itself could be around 2gb in size, however with the replication data in it it has ballooned to 6gb. On top of this, there is all the data in the D:MSSQLREPLDATAunc directories which seem to represent another log of some description.
Can I delete this data? I cant see what it would be used for and it totals some 25Gb! Obviously I cannot have this lying around on my server.
Does anyone know what it is used for?
thanks
Pete Storey
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Sep 22, 2015
I have a transactional publication done between two databases on different Virtual machines connected with a network. I noticed that for some reason Every time replication is happening (which is every 2,5 seconds) my data is deleted on the target DB (subscriber) then re inserted.
this should not happen, old data should remain then only the new data should be inserted.
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Apr 12, 2007
I need to move my database servers from one location to another. The issue is that I have over 200 databases to move and my clients can't afford a downtime. The collective volume of all the databases is over 2.5 TB and growing.
I am thinking to copy these databases in batches over the WAN to the new location and replicate them using Transactional replication till I have all the databases moved and synchronized.
Will it be wise enough to use replication for synchronizing 200 databases or is there a better approach which I can use to move these databases with minimum downtime and compromise on performance of applications.
Note: Migration is from SQL Server 2000 to SQL Server 2005.
Thanks in advance.
Ritesh
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Mar 19, 2008
Hi All...
This is my first time solving replication problem for me.Do help me out.
We have two servers A [Publisher] and B [Subscriber]. Today users complained there is data mismatch.I just did a Select Top 10 records from both A & B, and there is differences in the records.I have to fix this problem by today.What are the steps I should take to find the
Validate the mismatch records?
Sync both tables ?
Ensure Mismatch does not happend in future?
There is no error mssg that indicate's failure of replication
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Jul 20, 2005
Hi all.I need to set a oneway replication of some data from MSSQL (running underWindows 2000 server) to MYSQL (running under Linux).Do you have some ideas to solve the problem?Thank youLuca
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Jan 13, 2006
Hi All,
We have the requirement to replicate financial data to Aus from the UK, however I dont know if Replication is the best solution around?
Reason why I ask this, is that to create the publication, there are in excess of 10000 articles, which takes forever and a day to create, then when setting up the push subscription, this takes equally as long.
DB's physically range between 100MB and 2GB. Link to Aus is 2MB E1.
The accounts server isnt the most powerful of beasts (HP DL380, 1x1.4Ghx CPU) and with 4 DB's to setup and replicate, it's going to take some time.
With this in mind, I would also be looking to script out the publication should there be any failures and put it into SourceSafe, however this would also take a vast amount of time.
I've thought about using Log Shipping, however I dont know if there are any better ways
?
Thoughts appreciated.
Steve
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Sep 20, 2006
Hi everyboby,
Can anybody tell me the differences, advantages and disadvantages between these three solutions? When do I may use one or another?
Could you recommend me any documentation?
Thanks a lot,
Radamante71.
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Apr 5, 2007
I want to replicate SQL Server 2000 data from publisher to subscriber with new data added and existing data modify at subscriber, is it possible? what is the solution.
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May 15, 2006
I am new to SSIS (though have a decent amount of experience with SQL Server 2000), and am trying to design a data warehouse and eventually a comprehensive reporting solution.
Here is our setup:
- We have ~150 studios all operating software which we designed (ie. we have control over the system that will be the Data Warehouse source).
- All studios use merge replication back to Head Office (we maintain a duplicate of each of their databases).
From my limited understanding of Data Warehousing methodology, I believe that I should prepare a 'staging area' which contains all needed data from these databases. My question is how to do this in an efficient manner (without resorting to software-maintained timestamps in all the source tables - this would require significant modification to our software).
Since replication is already identifying which rows are new or updated, I'm wondering if there is some way to use this information to limit the information processed during the Data Warehouse updating process. I realize that I would still need to determine whether the row was updated or new, but it would cut down immensely on the number of rows processed.
I feel like I could be missing out on a simple way to do my data extraction from the source DBs. Does anyone have any advice?
Thanks in advance for your help.
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Mar 28, 2008
thanks 4 ur rpl..well i have a simple doubt if u can guide me it will b gr8 help..well i am developing an application of location based services, in which i am going to store my data on SQLserver 2005 and will fetch the data from it when the user logs in to the user's PDA device so that a user can work offline on the data when there is no connection and when he gets the connection he can synchronize the data with SQLserver 2005. so now i m confuse whether i should use the merge replication or ado.net synchronization framework or RDA?what is the difference between merge replication and synchronization and which is better?
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Jan 4, 2007
Dear ppl,
I have a question for you. One of our client has asked us how is the data secured over the air during Replication?
I have read that Merge Replication uses TLS (Transport Layer Security) protocol to secure the data over the air. But I was wondering if it is all done automatically ? Or do we need to install certificates like for SSL.
We have a Windows Mobile 5.0 application using SQL Mobile that runs over 50 devices and they all synchronise with a single Publisher SQL Server 2005 using GPRS connection. We haven't got any SSL certificates installed on the server.
Now how can i make use of TLS in my application to secure my data over the air (using TLS)?
Regards
Nabeel Farid
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Feb 15, 2007
In SQL Server 2005 SP1 we have a Transactional Replication with only this property in the articles:
Action: Delete data...
Ant this property in the publication:
Don't send schema changes
We have in the foreign keys NOT FOR REPLICATION = NO (Exigir para replicacion = "Si" in Spanish).
We have one problem and one doubt:
The problem is that when the sincronization goes wrong the table in the suscriptor is empty !!!!!. It seems that goes wrong because the foreign keys. The question is = Is necessary that NOT FOR REPLICATION = YES in all the tables?, we don't want any check in the sincronization.
Why the destiny tables appears empty?. Is very dangerous.
Thanks.
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Oct 26, 2007
Guys,
I have 14 databases, the last database - 14th one will have lookup tables only. The other 13 databases will have these lookup tables and data tables. At the end of each day I will make updates for lookup tables on 14th database, I want to be able to push the updates to any or some of the 13 databases. Look up tables will have only upto 100 rows, so I am not concerned about the bandwidth. What is the best way to accomplish this.
Any suggestions and inputs would help
Thanks
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