Impact On Replication When A Server Goes Into Standby Mode
Sep 1, 2007
We have the following scenario:
Server A replicates Database A to Server B.
Server C has Database A on it as well, but in standby mode. We are applying the transaction logs generated by Database A on Server A to the database on Server C leaving it in standby mode each time.
Let's say we had planned maintenance for Server Aand dumped the last set of transactions on Server A in standby mode to be applied to to Server C. What happens to the replica on Server B? When I start to use Server C, can I backup its transactions and apply them to Server A, and then have those transactions replicated to Server B? And then what do I do when the maintenance is complete so that I can swithc back to Server A and have the replication continue on as before the maintenance to Server B?
Thanls
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Jul 20, 2005
SQL Users/DBAs,I'm trying to move data files around for a database that is in standbymode. I can detach/attach the database fine usingSP_DETACH_DB/SP_ATTACH_DB , but when I re-attach the database the logsequence is broken and I can't restore any more logs. Does anyoneknow if there is a way to move around data files and keep the databasein standby mode?Thanks,JB
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May 12, 2008
We are using MSSQL 2005 and Log Shipping.
After making our secondary SQL server primary, how can we put the secondary SQL server back into standby mode?
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Feb 28, 2002
I hope to create a 'Standby' server for a critical web application. I am tempted to set up replication, but realize this task could also be done by a scheduled DTS job, which may be much simpler. I have read up on replication and have some reservations about it. A little about our environment: Data does not change very rapidly. Some days maybe no edits, some days maybe changes to 100 rows. The environment is stable, there are few DDL changes....development is essentially over. This system has 10 databases which it uses. Hence, all would need either replication or DTS Transfers. Intended publishing & subscribing servers are on same domain. Both are production servers. I Believe either Snapshot or Transactional would meet our needs if we replicate. There is no user need for replicated data. This is SOLELY a Disaster Recovery motivated situation. Reservations about replication include the hassles with identity columns, the hassles with Subscriber Databases being left in 'Read Only' mode (thereby slowing & complicating the recovery process), the difficulty in cleaning up a server after replication is halted if we abandon replication. My gut feeling is DTS might be best. There are 10 Databases. Sizes (inaccurately) reported are 5 at less than 5 MB, others at the following sizes: 10 mb, 24 mb, 26 mb, 39 mb and one big one: 3000 mb (3 gb). Latency is not a big issue. If these were DTS'd nightly that would be fine. Transactional Replication would be slightly better, but the amount of data change is not high. I would solicit anybody's input on this. Thanks,
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Nov 11, 2007
Hi all,
I have a question about log shipping and assembly on the secondary server. I have configured log shipping to the secondary server and the secondary server in standby/read-only mode. I have test everything for reading from that database on the secondary server; and all ended with great seccess, except for assembly.
My assembly simply turn bytes into text or the other way using UTF-8 encoding, nothing serious, and I have checked that assembly on both server have the same thing every where. However, I continue getting the error:
Msg 10314, Level 16, State 11, Line 1
An error occurred in the Microsoft .NET Framework while trying to load assembly id 65574. The server may be running out of resources, or the assembly may not be trusted with PERMISSION_SET = EXTERNAL_ACCESS or UNSAFE. Run the query again, or check documentation to see how to solve the assembly trust issues. For more information about this error:
System.IO.FileLoadException: Could not load file or assembly 'asp.clr, Version=2.5.0.1, Culture=neutral, PublicKeyToken=9ed52bcb68360e98' or one of its dependencies. Assembly in host store has a different signature than assembly in GAC. (Exception from HRESULT: 0x80131050)
System.IO.FileLoadException:
at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.Load(String assemblyString)
I have tested this assembly on the secondary in a read-write database, and it works fine. I can see both assembly sharing the same same thing ...
Is there a limitation for read-only database on assembly using?
Thanks
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Jan 16, 2008
How can I get a SQL Server 2005 database out of Standby/Read-only mode? I just restored this DB sent from a customer and it is in Standby/Read-only mode. I need to add a user so that I can authenticate from my app for testing purpose.
Thx
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Jul 31, 2006
Hi,
I am testing with Log shipping, I have it setup and it is working just fine. The secondary database was restored with Standby mode and is readonly. I have no problem accessing and querying data from the secondary database but I noticed if changes are made to the primary and I am accessing the database when the restore step to the secondary runs it fails with the following error:
Message
2006-07-31 09:40:54.33 *** Error: Could not apply log backup file 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupLogShipCI_REPLICATION_TEST_20060731131501.trn' to secondary database 'CI_REPLICATION_TEST'.(Microsoft.SqlServer.Management.LogShipping) ***
2006-07-31 09:40:54.33 *** Error: Exclusive access could not be obtained because the database is in use.
RESTORE LOG is terminating abnormally.(.Net SqlClient Data Provider) ***
This appears to be because you can not restore to a database that is in use? How do you get around this? Is it possible? How do I query data from the secondary db without worrying about causing log shipping to fail? Do I not worry about it because at somepoint when Exclusive access is obtainable all the logs will be rolled forward, but this could create a wide gap in sychronization between the primary and secondary db's, say if someone or something does not properly log off. I guess I could disconnect all users prior to applying tlogs but that kind of defeats the purpse of having it in read only mode so that data can be accessed? Couldn't really depend on it as a stable source of data for running data extracts? I suppose it could all just come down to timing everything in the appropriate sequence? Anyway.....
To sum up:
Is there anyway to access the standby server without causing the restore process to fail?
Both the Primary and Secondary are SQL 2K5.
Thanks!
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Jul 20, 2005
We have a SQLSERVER database that is replicated to many users.We are currently in an expansion phase where we need to make changesto the server database. Each time we rollout a new release, we aredeleting the local replicating database and recreating.Is there any way to automatically transfer the changes from the serverto existing local database without deleting?
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Oct 13, 2000
Does sql server have hot standby database? what are the pros and cons of using replication vs hot standby database? Thanks for helping me.
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Nov 14, 2007
I've been reading a million and one posts on replication
My scenario is that i have a live SQL 2000 server. In a DR invokation, i'e i've lost my live sever, i want to be able to access the same data at the DR (SQL 2000) site and have it accessable to the users. DR server has a different name to the live box.
Replicate
Master
CRMDatabase
Data changes all the time but can have hourly replication of transaction logs for this example. I've currently researched a sp called update logons but this has to be fed each account name to enable them on the new server. There must be a way to activate all CRMDatabase logons with the new server?
Could someone be kind enough to lead me through a step by step guide on the best solution.
Thanks a lot
David
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Nov 19, 2007
Hi,
The standby file (.tuf file) got deleted accidentally on the secondary. How can I recover the database without the standby file?
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Mar 26, 2005
Recently I read such statments 'When SQL Server is run in "lightweight pooling" mode (fiber mode) and the DTC service is started, unexpected behavior may occur.'
Can someone say anything about fibe mode?I am appreciated for it.:)
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Jan 4, 2005
Thanks to all participants.
I am using SQL Server 2000 with replication object for two location. Log size on publisher go upto 25 times of data file size, I mean 80 MB Data files has maintains 2 GB log file and it is same for all five co's working on same windows 2000 advanced server board.
Since last week server randamly get disconnected from user applications and at that time few tables are not openable at server.
Can any one give a reason ? Why this type misbehaviou done by SQL Server 2000?
Thanks.
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Dec 28, 2001
Hi
Could you suggest me some of the ways to have standby database server?
All of a sudden my company is in a need for standby database server in sync upto the 10 minutes. Main production database is about 8 GB. It serves almost 6 main sites for the company. No body in my group has worked with standby server issue before.
Any suggestion would help.
Thanks,
Linea
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Oct 23, 2001
Hello !
I need to have a hot backup of my Production db
and i going to set up StandBy server : restore Production's backup
to StandBy
could you help me ?????
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Dec 28, 2000
Hello,
I need to create standy server. My production server has SQL Server 7.0 and standby server has SQL Server 6.5. I've sync the data between two servers and is planning to do log shipping every 15 min. But I'm little confused, Can the version of Sql server be problemetic? Pls. anyone guide me.
Thanks.
Sejal
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Feb 15, 2000
Can I implement the Standby SQL Server using the SQL Server Standard Edition? What's actually the difference between Standard and Enterprise Edition? As I know the Enterprise edition can be installed for up to 32 CPU while Standard edition can only be installed for up to 4 CPU.
Many Thanks in advance!
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Jul 20, 2005
Hi:Anyone has a detailed procedure description about how to setup a standbyserver? Microsoft makes it sounds very easy which are more complicated.How to handle system databases, does standby server need to be exacthardware as the primary one?Thanks in advance,Xiaodong*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Aug 5, 2015
Our SQL Server 2008 r2 has collation Latin general.
And my database 'DB1' , 'DB2' has collation set to Japanese unicode.
My sql team has informed they cannot change system collation as it hosts other db's as well.
My Query: What will be the impact of changing collation from JP to Latin.
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Feb 15, 2000
Can I implement the Standby SQL Server using the SQL Server Standard Edition? What's actually the difference between Standard and Enterprise Edition? As I know the Enterprise edition can be installed for up to 32 CPU while Standard edition can only be installed for up to 4 CPU.
Many Thanks in advance!
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Aug 20, 1999
Where can I find a document that describes how to setup and configure a standby server?
I'm new to SQL Server 7 (I like it). We have a NT 4.0 server with SQL Srvr 7. We just bought another Box that will have the same thing on it with the idea if the 1st goes down, the new box is a 'hot' standby...of course a 'cold' standby will be ok too... I'm not fussy at this point. If you have info on both great.
I'm the SQL Srvr 7.0 DBA (my background is Oracle DBA). I've been doing alot of reading!!!
Can some provide the information I need or point me to someone I can contact?
Thanks
Ron Nixon (650) 940-6419
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Jan 14, 2004
We are maintaining a stand-by database server by doing a daily manual restore of logs. On weekends we do Reindexing of the tables for performance boost. some of these reindexing jobs take upto 10 Hrs
We have found that the restore of the logs taken in the source server after the reindexing job takes as much time it took to do the reindexing.
Typically 15 transaction log sessions for a day takes 40 minutes to restore. However the restore of the tranlog that was taken after a 10 Hr long reindexing job takes as much time(10 hrs) to do the restore also.
The size of the tranlog does not justify this time frame. ( Size of tran logs after reindex is more than other logs but is less than 3 GB)
I would like to know what exactly is happening during the restore of the tran log. Is it doing the reindexing in the destination system as well?
The destination server (standby) is in non recovered mode all the time.
The interesting thing is that I would only take 8 Hrs to do a full restore of the database. We are using ArcServ software for backup and restore.
We are on SQLServer Enterprise 7.0 sp4 on NT 4 Enterprise on source and destination.
We run SAP R/3 on a MSCS Clustered env.
The source database size is 260 GB
Any Comments?
Appreciate your replies
Cyriac
A
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Dec 15, 2006
We have a process wherein the production DB is replicated to a server.subscriberA nightly and then a job processes the database for reporting services. Whenever the job fails we have to redo the process all over again. By the time we are finished it is already late in the day and our customers dont like it. Our solution for a standby server is as follows:
1. create another server.subscriberB and start same process from server.subscriberA. So, both servers are replicated from the Production server but SubscriberB is set to run half an hour delayed than subscriberA. The purpose is that should subscriberA process fails, we still have subscriberB. Then we could just change the datasource of the reports to subscriberB
2. replicate subscriberA.ReportServerTempDB to subscriberB.ReportServerTempDB
3. replicate subscriberA.ReportServer to subscriberB.ReportServer
Any insights highly appreciated...
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Oct 29, 2007
I have some doubts on standby.
I will explain my environment.
I have two servers A and B both with Win2003 SP1
In the server A, i have a database sql server 2005 in compatibility mode -> 8.0.
In server B have SQL server 2005 and one database in standby / read-only mode. This base is getting to the transactional hour of the server A and applying in standby database. This works fine.
The problem I have is: I need to get the standby server B and create another database for test using yours files. I can get the files of server A because i have 512kpbs link and would be impractical.
Putting in the standby offline mode, i copying the files to another directory on the same machine, but when I try to create another database using the duplicate files of standby receive the following message:
Msg 1824, Level 16, State 1, Line 2 Can not attach a database that was being restored.
What is the command that I need to execute to attach the new bank without message Msg 1824. The command that executing is below:
USE master CREATE DATABASE ON homo (FILENAME = N'F:MSSQLDATAhomohomo_prd_homo.mdf '), (FILENAME = N'F:MSSQLloghomohomo_prd_log_homo.ldf ') FOR ATTACH
As a newcomer I do not know which command I run before attach to conclude restore.
I execute restore database with homo recovery but the database does not yet exist. If I run the restore standby database with recovery, I lose standby and need to download backup copy the entire database in server A to B using link.
If someone has any idea is welcome.
Gustavo
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Oct 12, 2004
SQL Server 2000:
Question 1
If you drop / rename a table and then recreate the table with the SAME NAME, what impact does it have on stored procedures that use these tables? From a system perspective, do you have to rebuild / recompile ALL the stored procedures that use this table?
I had a discussion with someone that said that this is a good idea, since the IDs of the tables change in sysobjects and from a SQL SERVER query plan perspective, this needs to be done...
Question 2
If you Truncate a Table as part of a BEGIN TRANSACTION, what happens if an error occurs? Will it Rollback? The theory is that it won't because Truncate doesn't utilize the logs where as Delete From uses the SQL Logs?
Thanks!
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Jul 27, 2015
For example in a Select Statement we have many tables and we have Where Clause with many conditions with AND operations. Do the SQL SERVER would apply the Where clause after all fetch or can dynamically decide about to include the related Tables from Select Statement Orderly with respect to where clause predicates? (SQL SERVER would not fetch data of those tables for its Select, where the AND condition in Where clause fails or by logic would be fruitless/not-related.)
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Sep 28, 2007
We are currently testing a Replication topology as follows:
SQL Server 2005 Developer as publisher and distributor of a push updatable transaction replication
2 SQL Server 2005 Express clients as subscribers.
The replication is working great. If the connection is lost, the subscribers switch from Immediate to Queued Updating, and seem to shift back to Immediate when they regain the connection.
My question is to determine if there is a way that I can ask SQL Express on the client which mode is it currently running, or ask SQL Express if it has a current live connection to the distributor.
I know that they are usually mutliple ways to accomplish tasks, and I would be open any suggestions, preferrable programming in VB (such as with SMO or RMO) or using stored procedures or functions.
I hope this give some people something to chew on during the weekend and thank you to all that have taking the time to read this.
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Sep 5, 2013
I am upgrading my application's SQL Server from 2008 R2 to 2012.
As discussed in the below URL I am able to see the Identity jump after I upgrade and the server is restarted.
Now since I cannot afford this and at this moment I do not have the time to create a sequence with NOCACHE and test it again I have to go ahead and add trace flag 272 in the start up parameter as this is the only solution which I can implement and even rollback without much hassles.
[URL] ....
What I got to know, this flag will disable the new feature of IDENTITY property that has been implemented as part of SQL Server 2012 and will make it work like it was doing in SQL Server 2008 R2.
But I want to know implementing this flag would impact any other feature or performance (except the performance of IDENTITY) of SQL Server.
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Jul 15, 2001
We need to perform some maintainence on our database server which may take quite some time. We have a standby server which we constantly apply logs to.
We are planning to recover the standby server and use it while the production server is being maintained.
My question is how to I get back to using the original production machine.
The only way I can think of is to do a full backup on the standby machine,
do some transaction log backup and then restore these on the original production machine.
Is there any way to use the full backup from the original production machine and well as logs from the standby machine. When I try this I get the message that the database has not been rolled forward far enough.
In summary:
1. Backup full database on Prod Server
2. Restore full database on Standby Server
3. Backup transaction log (1) from Prod Server
4. Restore transaction log (1) on Standby Server
5. Recover database on Standby Server
6. Make modifications on Standby Server
7. Backup transaction log (2) on Standby Server
8. Restore full database on Prod Server
9. Restore transaction log (1) on Prod Server
10. Attempt to restore transaction log (2) fails.
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Aug 3, 1999
I have been asked to implement a Warm Standby using Transaction Logs on our main SQL Database - Version 6.5.
Can anyone give assistance regarding scripts, etc., which control the process.
Any assistance is much appreciated.
Regards,
Ian
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May 9, 2007
I have one cluster (two machines) of sql server 2005 active/passive called "ClustA" with one Ent. server edition license and another separate server called "STDA" as warm standby server for "ClustA".
Do I need SQL Server license for server "STDA"?
Thanks
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Jun 21, 2001
Can anyone direct me to a code that would automatically apply transaction logs to a DB in the standby server? We have a process that dumps the transaction log backup from the primary server into the backup server every hour on the hour, but I need to apply that transaction log as soon as it is in the standby server.
I am sure someone will ask, why not do transactional replication or log shipping? My answer to that is I have yet to learn how to setup replication between servers. I need to get our backup server up and running in the next few days.
Thanks in advance for your help.
Helen
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