Accessing Database In STANDBY Mode While Log Shipping
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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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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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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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 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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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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Dec 13, 2006
Hi,
I am trying to implement a log shipping scenario in sql 2005 where the secondary server is in standby mode with the ability to roll change during failover.
With the help of BOL (ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/udb9/html/2d7cc40a-47e8-4419-9b2b-7c69f700e806.htm) I can implement my scenario in Recovery mode, but not in standby mode. I use the following sql to put my primary in standby
BACKUP LOG [database]
TO DISK = @filename
WITH STANDBY = 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLBackupROLLBACK_UNDO_database.BAK'
GO
which works, but then my restore job fails on the last step. How can I put my primary db in standby mode in such a way that the log shipping restore will work?
Thanks
Andy
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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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May 6, 2014
we are about to start a logshipping with the secondary server in read only mode.
I just wanted to know the disadvantages of using a read only on the secondary server.
I mean whether the transactional logs will be restored periodically or it won't be restored till users are connected on the secondary server.
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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?
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Thanks a lot
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Dec 11, 2007
Hi,
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The 'PerspectiveID' custom property for the 'query' perspective is either not set or is not set to the string data type.
----------------------------
Semantic query execution failed.
----------------------------
Query execution failed for data set 'dataSet'.
----------------------------
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http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=368962&SiteID=1
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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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Oct 9, 2007
I need to move a datafile on my secondary database which is in standby mode. I have attempted to use the Restore command with the move and standby parameters
use master
RESTORE LOG BWP FROM
DISK='L: rans_bkpBWP_20071009080001.trn'
WITH MOVE 'BWPDATA3'
TO 'N:BWPDATA3BWPDATA3.ndf',
standby='L:TRANS_BKPBWP_20071009130001.tuf'
But I get the following error message
Msg 3174, Level 16, State 1, Line 1
The file 'BWPDATA3' cannot be moved by this RESTORE operation.
Msg 3119, Level 16, State 1, Line 1
Problems were identified while planning for the RESTORE statement. Previous messages provide details.
Msg 3013, Level 16, State 1, Line 1
RESTORE LOG is terminating abnormally.
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Feb 7, 2006
Hi all,
we want to create a offsite redundant server which can be a standby machine if something happens to our primary machine, any input how to do this over internet? what type of bandwidth we need, and for security ssl or vpn? or anything i missed thats important to consider. Plans are to use sql server 2005. Thanks all
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Dec 18, 2007
I am in the process of migrating from Sql Server 2000 to 2005. Part of my plan is to move some database's to 2005, but use the 2000 compatibility mode for the short term. My issue is this, our DR boxes are still on SQL Server 2000, would I still be able to use our log shipping processes? Or would I be better off in starting with migrating the DR boxes to 2005 first?
Thanks in advance.
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Mar 23, 2015
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We now have an issue where users are unable to access the remote secondary database without having sysadmin privileges. Clearly we want to avoid this!
We want to be able to use Windows Authentication mode on the server of the secondary database. But since the two domains differ, is it possible to even achieve this?
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I would like to do partitioning one of my client, but that primary database is participating in log shipping.
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Oct 2, 2006
Hi Folks
anyone could provide steps, links, on how to bring secondary online, with more than one database being log shipped ?
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May 12, 2008
We have a user Training database that we would like to keep updated from our Production database. Users would make different modifications to the Training and Production databases. It is the user updates on the secondary that bother me and I have not seen anything that indicates Log Shipping would fail if new random records are added to both the secondary and primary.
Would Log Shipping be appropriate for this nightly update of Training from Production?
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Jun 30, 2007
In order to move from one data center to another, I am planning to use log shipping.
Lets say,
Current Data center - DC1
Current Server- S1
Current Database- DB1
New Data Center -DC2
New Server -S2
Now, on the New Server S2, I already restored DB1 as DB1 for QA testing. QA has to do some testing before we move from DC1 to DC2. In the mean time, I need to start log shipping from S1 to S2, so that we can fail-over to S2. Now since DB1 database is already present on S2, I can not use the same name. I will have to use some other name (say DB1_New).
I can not wait for QA to finish their testing. I have to start log shipping before that. When QA is done, I will delete the DB1.
So for this log shipping, -
Primary - S1- DB1
Secondary - S2 DB1_New
So when we fail-over, we will have the database name as DB1_New. But all the apps use the name DB1. So I will have to rename the database as DB1.
So want to know, will this renaming the database (DB1_New to DB1) cause any issues?
Anyone had similar experience?
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Oct 25, 2006
Hi
I'm looking at replicating our primary SQL server to a secondary offsite server (linked via 100Mb so effectively LAN speed). What are people's preference when deciding on a solution?
On the surface mirroring looks much better but having dug a little I've found it is recommended only 10 databases are mirrored per instance. That said, I've found a post from someone who is upto 58 databases mirrored. Are there similar limitations with log shipping?
Does anyone have any experience of mirroring and is using it in prefence to log shipping?
Our current recovery strategy is the classic restore the SQL dump from tape onto a rebuilt server so either method will be a vast improvement. None of our databases are mission critical that they need upto the second replication. 15 minute replication would be fine leading me to think that log shipping may be better given the possible limitations of mirroring
For recovery, I was considering amending the DNS records of the Database servers. Does anyone see any issues with this approach? I understand there is a automatic failure function if using mirror but this may require the application to be coded correctly?
Thanks in advance for any feedback
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Oct 3, 2006
Hello All Database Mirroring Experts,
I'm interested in how Combining Log Shipping and Database Mirroring works when failover occurs.
From SQL BOL, it says:
"Topic: Database Mirroring and Log Shipping
...
To run in high-safety mode with automatic failover the mirroring
session is configured with an additional server instance known as the witness.
If the principal database is lost for any reason after the database is
synchronized and if the mirror server and witness can still communicate
with each other, automatic failover occurs. An automatic failover
causes mirror server to assume the principal role and bring its
database online as the principal database. For more information, see Automatic Failover
[ http://msdn2.microsoft.com/en-us/library/ms189590.aspx ] . If the log
shipping backup location is accessible to the new principal/primary
server, its backup jobs begin to ship log backups to that location. The
database mirroring synchronous mode guarantees that the log chain is
unaffected by a mirroring failover and that only valid log is restored.
The secondary servers continue to copy log backups without knowing that
a different server instance has become the primary server.
..."
Source: http://msdn2.microsoft.com/en-us/library/ms187016(d=printer).aspx
Could anyone tell me that how the database mirroring synchronous mode guarantees that the log chain is
unaffected by a mirroring failover and that only valid log is restored?
Let me elaborate the situation (if anything I said is incorrect, please correct me )
Here is the time line of the failover happens:
------- tn-1 ---------- tn ---------- tf -------- tn+1 ---------------> t
----------------> t: the time line.
tn: the moment that the log shipping backup job and copy job is done for the transaction log obtained between the time interval tn-1 and tn.
tf: the moment that mirroring failover occurs in the database mirroring session.
the time interval between each tn and tn-1 are constant, say h seconds, for all n are positive integers.
Here is the question that I want to ask:
In database mirroring synchronous mode, it guarantees that all the committed transaction from the moment tn to tf is copied to the mirror database. All the transaction log backup for log shipping are done on the original principal before the moment tf. After the mirroring failover occurs at the moment tf, how the log shipping mechanism guarantees that the transaction log between the interval tn and tn+1 that can be unaffected by a mirroring failover?
That's the point that I interested in.
Thanks a lot,
Terence
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May 13, 2007
Hi
I could not able to find Forums in regards to 'Log Shipping' thats why posting this question in here. Appriciate if someone can provide me answers depends on their experience.
Can we switch database recovery model when log shipping is turned on ?
We want to switch from Full Recovery to Bulk Logged Recovery to make sure Bulk Insert operations during the after hours load process will have some performance gain.
Is there any possibility of loosing data ?
Thanks
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Jun 26, 2007
Good day to the people who's reading this post!
I have some trouble with shipping my transaction logs to the secondary database be it on
another server or within the same server to another database instance.
Im using SQL Server 2005 workGroup editions with Service Pack 2.
Here are the problems that i encountered.
I do hope someone has bumped into such a problem and willing to help me out.
I tried on 2 separate servers (not domain environment) and also between 2 separate instances
(which is supposed to be simple!) on
our development server,but was unsuccessful.
Between 2 separate instances on the development server -
No error after configuring Log shipping though.
The configuring went through and it was a success.
Transaction logs was backup every minute and it got copied over to the other folder.
But SQL Agent not doing its last job which is supposed to restore to the secondary database on
another instance.No errors given out in SQL Agent error log files.Anywhere else im supposed to
look to see if there are errors given out?
Both instances SQL Agent has the same log on username and password with Administartive rights
So what went wrong?
Between the 2 servers-
The transaction logs was backup every 1min on the primary server
but it didn't got copied over to to the secondary database.
- Error message given was:Error in restoring database to the secondary
database.Network path given could not be found. Can't open the AxTest.bak file.
(i am very sure i have type the correct network path,even have shared it out and i think the firewall
is blocking incoming traffic since unlike our development server,
which allows us to access when we use Start>Run and type in the ip address,user name
and password,the primary server will only tell me no network path was found)
I also believe it's because the SQL Agent on the secondary database server wasn't given
permission to access the primary database folder.
I've shared out the drive and folder on the secondary server and
even have allowed SQL Agent to read,write and modify on both servers.
For the primary and secondary SQL Agent,
I configure their log on to be the same user account name and password
which have administrative rights.
So what went wrong?
Isit really true that both servers have to be in domain environment before you can configure log
shipping,mirroring and replication?
Hope someone help me out of this predicament.Thank you in advance!
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I want to configure the logshipping to secondary database.
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