Client Failover Problems
May 25, 2006
Hi,
I encountered 2 problems when my application reconnects to the mirror database after the principle database is not available.
My Connection String:
Data Source=ServerA;Failover Partner=ServerB;Initial Catalog=TestFailover;Persist Security Info=True;User ID=sa;Connect Timeout=45
Firstly, the following exception will be prompted when failover occurs:
A transport-level error has ocurred when received results from the server. The specified network name is no longer available
Q1: Is it normal to have this exception? Otherwise, how can I avoid this exception?
Secondly, I tried to capture the exception and retry the operation, then failover successed but the time is very slow. A simple update operation takes about 2 mins to complete which can be finished within a second under normal situation. I tried to set the Connect Timeout to 30s, but the application pending for long long time.
Q2: How can I improve the time need for failover?
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Mar 3, 2007
We have set up Mirroring with a witness server and everything works fine when we failover from the SQL Management console.
However, if we failover when our Maccola client is connected, the client blows up - clearly because it can no longer connect to the database.
The ODBC DSN used by the Maccola client shows a checkbox for the 'select a failover server' but the checkbox is grayed out.
Also the summary of settings for the DSN at the end of the wizard reveals that the failover to server (y/N) option is set to N.
The default setting for this DSN is 'populate the remaining values by querying the server' but it doesn't appear to be getting the settings for failover from the server or any other interactive DSN settings either. The server is clearly set for mirroring.
Another suspicious item is that the DSN cannot connect to the server with SA permissions, even though the server is set to mixed security and we use the correct authentication.
Is it possible that the client MACHINE is not authenticating with the domain or sql server properly. We are logged into the client with the domain account that is the SQL admin account on the sql server box.
We should be able to interact with the sql server settings through the ODBC DSN on the client shoulnd't we?
Are we missing a service pack on the client?
Thanks,
Kimball
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Apr 7, 2008
The following looks very much like the problem reported for the JDBC driver.
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=688897&SiteID=1
https://connect.microsoft.com/SQLServer/feedback/ViewFeedback.aspx?FeedbackID=191767
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I've written a small VB .Net app using Visual Studio 2005 to test mirroring from the client's perspective.
I have a button that does the following: 1) opens a connection to a sql 2005 database (SP2), 2) uses the connection, 3) closes the database connection.
After running this code, but while the client app is still running, I failover the database to the failover partner.
When click my button again, I get the following error: "An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)". Checking the Event log on what is now the mirror, I see a string of "18456 Login failed for user 'testuser'"
If I close the app and launch it again, it does the right thing (and connects to the new primary). Also, instead of closing/re-opening the app, if I wait long enough (e.g. 10 minutes), then try again, it connects successfully to the new primary. Finally, instead of closing/re-opening the app if I tweak the connection string (e.g. change the application name) then try to connect again, that also works.
Based on articles I've read online, I've disabled the connection pool in my connection string, but that didn't solve my problem (although I'm getting a different error than if pooling is on).
Here is the connection string I am using:
Data Source=DB1PACS,12345;Failover Partner=DB2PACS,12345;Pooling=False;Initial Catalog=PACSTest_Client;Integrated Security=No;User ID=testuser;Password=*****
Here is the code snippet that I run before and after the failover. Based on the fact that I'm not using Pooling, the ClearAllPools() if overkill. Any help would be appreciated; I've been researching this for days without luck.
I can keep clicking the button that runs this code, and it keeps failing. If I wait long enough (e.g. 10 minutes) and then click the button again, it works. Or I could quit/restart the app, or tweak the connection string.
Dim TestClient_Connection As New SqlClient.SqlConnection(txtConnectionString.Text)
If Me.DataGridView1.Rows.Count > 0 Then Me.Test_ClientDataSet.Clear()
Try
TestClient_Connection.Open()
Me.User_TTableAdapter.Connection = TestClient_Connection
Me.User_TTableAdapter.Fill(Me.Test_ClientDataSet.User_T)
TestClient_Connection.Close()
TestClient_Connection.Dispose()
SqlConnection.ClearAllPools()
Catch sqlex As SqlClient.SqlException
txtErrorMessage.Text = "Error State: " _
+ sqlex.Errors.Item(0).Number.ToString _
+ " Message: " + sqlex.Message
End Try
Similar to the JDBC driver article I mentioned, when using the connection string above (where DB1 is the principal and DB2 is the failover partner) if DB2 is the actual principal when I initially query and close the database connection, then after failover to DB1 my application reconnect just fine.
Thanks
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Jul 17, 2015
The main objective is to have a third party program operate on a failover cluster. The OS is Windows Server 2012 Datacenter loaded on 2 nodes. A virtual node exists along with supporting disks. This client software uses a SQL Server database. SQL Server 2012 Enterprise is installed and operating in a failover environment. However the client software is not failing over. If the connection to node A is lost, SQL Server fails over to node B. But the client application does not.Â
What needs to occur in order to associate the client software with the failover cluster? This software has 6 services total installed. Some are referred to as servers - looks like to communicate between remote client computers and the database. What is the process to associate the client software with the failover?
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May 12, 2008
We are having problems getting the ADO.NET client to failover in a timely manner in a web application. Here's what happens:
1) Database fails over in 3 to 5 seconds
2) Clients attempt to login to primary and receive SQL server not available errors
3) The clients slowly start to connect and succeed without errorson the secondary.
4) We are still see SQL Server login errors on the primary, even after the failover
5) When we failback to the primary, it all happens within a few seconds (no problems)
If we recycle IIS, this problem goes away
Here's what we have tried
1) Turning off connection pooling (has no effect). We also can see the connections get killed on the primary server
2) Applying this hotfix (http://support.microsoft.com/kb/944099)
And yes, we are running a script to sync up the SIDS so that doesn't appear to be a problem. What seems to be happening is the primary server is getting stuck in the ADO.NET application memory. The problem is we don't know how to fix it.
BTW, our hardware is SQL Server 2005, Windows Server 2003, .NET 2.0 (and .NET 3.5)
Let me know if you need additional information. Thanks in advance
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Dec 9, 2006
I have setup a database mirroring session with witness - MachineA is the principal, MachineB is the mirror, and MachineC is the witness. Each SQL Server instance is hosted on its own machine. The mirroring is working correctly. If I submit data to the database on MachineA, and then unplug the network cable on MachineA, MachineB automatically becomes the principal, and I can see the data that I originally submitted to MachineA on MachineB. All the settings are showing correctly in Management Studio.
My issue is with the SQL Native Client and a front-end application that needs to make use of this database. I have setup my front-end application to use the ODBC client and specified the failover server in both the ODBC setup and the connection string. Here is the connection string that I am using :
Provider=ODBC;Database=master;DSN=MachineA;Failover Partner=MachineB;
Everything works perfectly on my front-end application when MachineA is the principal. If I unplug the network cable on MachineA, MachineB becomes the principal, and the failover occurs correctly on the database side. The problem is that my front-end application is not able to query the database on MachineB.
BUT - if I plug the network cable back in on MachineA (making the database on MachineA the mirror), the front-end application now works and can access the principal database on MachineB. I wrote a quick tester application to verify what I am seeing, and I am convinced that this is what is happening. The mirroring is working perfectly, and everything is setup correctly. The SQL Native Client is setup correctly. The problem is that the automatic failover to MachineB that is built into the SQL Native Client only works if both servers are plugged in.
In this scenario, when I plug both servers in, I know that the front-end app is definitely pulling from MachineB (since the mirror database on MachineA is in recovery mode, it's unavailable, and the front-end app displays the server that it is pulling data from).
Am I using an out-dated SQL Native Client? The version number displayed in the ODBC configuration page is 2005.90.2047.00, and is dated 4/14/2006. Has anyone experienced this issue? I'm guessing that it's a problem in the SQL Native client, since the mirroring really seems to be working correctly.
Thanks,
Bill
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Oct 29, 2015
1. Once fail over to secondary replica, what will happen to connected session in primary node? can the session fail over to secondary seamlessly or need to re-login. what happen committed transactions which has not write to disk.
2. Assume I have always on cluster with three nodes, if primary fails, how second node make write/ read mode.
3. after fail over done to 2nd secondary node what mode in production(readonly or read write).
4. how to rollback to production primary ,will change data in secondary will get updated in primary.
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Oct 29, 2015
1. In alwaysON fail over cluster, Once fail over to secondary replica, what will happen to connected session in primary node? can the session fail over to secondary seamlessly or need to re-login. what happen committed transactions which has not write to disk.
2. Assume I have always on cluster with three nodes, if primary fails, how second node make write/ read mode.
3. After fail over done to 2nd secondary node what mode in production(readonly or read write).
4. How to rollback to production primary ,will change data in secondary will get updated in primary.
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May 28, 2001
We have 15 clients running our applicaton
14 of then conected to SQL server using TCP/IP and it runs fine
1 of 15 when connected using TCP/IP produce "..Time out error "
but runs fine when swiched from TCP/IP to Named pipes
1.What area should we look to correct problem with Time out using TCP/IP ?
2. Where to get information about using TCP/IP via Named pipes ?
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May 10, 2006
Product: Microsoft SQL Server 2005 -- Error 29515. SQL Server Setup could not connect to the database service for server configuration. The error was: [Microsoft][SQL Native Client]Encryption not supported on the client. Refer to server error logs and setup logs for more information. For details on how to view setup logs, see "How to View Setup Log Files" in SQL Server Books Online.
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May 2, 2006
On Windows XP systems I get the following issue when trying to browse the MSDB folder in SSIS
Client unable to establish connection
Encryption not supported on SQL Server. (Microsoft SQL Native Client)
I have noticed another post where several others have noticed the same issue. It appears to only occur on Windows XP installations. Is there a workaround or fix for this?
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Nov 1, 2006
Hi,
I have SQL2000 installed as the default instance, and now I'm trying to install SQL 2005 standard edition as a named instance.
I receive this error :
SQL Server could not connect to database service for server configuration.. [SQL Native client] Encryption not supported on the client. However I'm able to install client tools
The setup works fine on other box with the same config : SQL 2000/Windows XP, is there any work around for this issue ?
In my SQL 2000 client network utilty "Force proctocol encryption " is desabled and did not find the setting for SQL 2005 !
Thank you
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Jul 23, 2005
Hello,Is it necessary to upgrade the Client Connectivity Tools on all clientmachines after the SQL Server database server is upgraded from Version7.0 to 2000?Thank you in advance!Eddy
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Mar 3, 2007
Hi,
While using Sql Native Client ,VB Application giving error
"Transcation Cannot Start because more than one ODBC connection is in use"
But when useing SqlServer client then work perfectly ok.
Please guide where to use Sql Native Client.
Thanks
Rizwan
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Apr 23, 2008
I have tried this on several different operating systems (VISTA and XP ) and several versions of SQL NATIVE CLIENT including 2005.90.3042.0
I have a 64 bit "SQL NATIVE CLIENT" connection that fails. The exact same connection and code succeeds on 32 bit.
My customer and I prepend "oledb:" to the connection string and it starts working.
FAILS on 64 bit:
Provider=SQLNCLI.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Wrigley_Test;Data Source=MONGO;Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=RIPTIDE;Use Encryption for Data=False;Tag with column collation when possible=False;MARS Connection=False;DataTypeCompatibility=0;Trust Server Certificate=False
WORKS
oledb:Provider=SQLNCLI.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Wrigley_Test;Data Source=MONGO;Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=RIPTIDE;Use Encryption for Data=False;Tag with column collation when possible=False;MARS Connection=False;DataTypeCompatibility=0;Trust Server Certificate=False
I debugged my code to the point that I know it is happening when I call CreateAccessor for my SQL statement.
m_hr=m_pIAccessor->CreateAccessor(DBACCESSOR_ROWDATA, GetCols(), (m_pDBBinds+IsBookmarked()), 0, &m_hAccessor, NULL);
Error:
Microsoft SQL Native Client: Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done.
Does anyone have any suggestions?
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Jan 22, 2007
I have to figure out a way to handle a failover in SQL Server 2005. I was reading a few articles about it.
1. Do I need to do anything in application layer to let a failover occur in SQL Server 2005
2. I have a web site that connects to a production server, the connection string is defined in web.config. If I implement Mirroring in SQL Server 2005, and when failover occurs, shouldn’t I change the connection string to point the application to the new server?
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Oct 2, 2007
Hi I just set up a new cluster and everything was working. Now when I try to test failovers like unplug the public network card etc...
The cluster group fails over correctly but my data and log array's dont failover.
So I unplug the network cable from node 1 (active) the cluster group with the IP, name, and Quorum disk fails over to node 2 but the other groups sql data and sql log stay on node1 and dont failover.
Any ideas?
TIA
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May 13, 2004
I have 4 servers, the first two are web app and load balanced the second two are to be configured for failover. Let us call them SvrA and SvrB. SvrA will have active SQL (2000EE) and passive Content (large directory of courses offered) SvrB will have passive SQL(2000EE) and active Content. Both SvrA and SvrB will be connected to a redundant SCSI 18 drive Drive bay (cheap SAN) which will be configured with a) mirrored OS drives, b) a RAID 5 partition for SQL and c) a RAID 5 partition for the content folders.
SvrA & SvrB will be quad processor machines. EE license for 4 processors as 2nd svr is failover for SQL.
My concern is the failover set up for the content portion, or is it the failure of the server that causes the failover? This is quite confusing to me.
Any thoughts would be most helpful.
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May 25, 2008
Hi there,
I am testing the db mirroring, making sure it will auto failover. I've stopped the SQL services on my principal and then I looked at the mirror db is says it's restoring. It stayed like that for 10 min before I enabled the mirroring again. Anyone knows why it's not failing over??????
Here's my setup: SQL 2005 Standard, Server 1 Principal, Server 2 Mirror & Witness.
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Mar 9, 2007
Hi all:
I was wondering what will happend to the transaction when the cluster failover from one node to another?
In my case the database is in node-001 and I need to restart the server on node-001. So I need to have the database failover to node-002, so I can work on node-001. During this process, will it effect to end-user?
Thanks
vua
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May 25, 2006
Is it possible to failover a single or a selected number of databasesonto a standby server? We're currently log shipping about 12 databasesto a standby and I was wondering if it was possible to randomlyfailover onto selected dbs.My understanding of log shipping is that when the primary server goesdown, the standby takes over. But, does that mean that all of the db'son the standby server now become the primary? Or, can failover occur onselected dbs?The reason I ask is because if one db on the primary, for example, wasto go down, I'd like to be able to bring the particular db on thestandby server online while I fix or restore what's on the primaryserver. Can it be done individually or is it an all or nothingscenario?Your personal advice or links is greatly appreciated.Thanks,Peps
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Jul 20, 2005
I have a 2 node Microsoft 2000 cluster with a shared storage device. Iwant to create automatic failover for MS SQL 2000 server. I can dothat wit the following options:1. Active/Pasive (one instance installed)2. Active/Active (More then one instance/virtual sql serversinstalled)I have a question about option 2.Is it possible to have more then one instance/virtual SQL server,service only one database for example loadbalancing. ?, or when youcreate multiple instances/virtual SQL servers, does that mean you havemultiple databases ? If not why does a Virtual SQL server has to betaken over by a cluster node that didnt fail. Then you can actuallyuse option 1. Please advise!The documentation is not very clear on this issues.Regards,Nico de Groot
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Oct 15, 2015
Could not able to connect secondary replica below is the error message I am getting when I tried to failover. Cannot connect to VLDBATEAM.
The secondary replica that you selected to become the new primary replica does not belong to the specified availability group. A possible explanation is that the replica has not been joined the availability group. Â (Microsoft.SqlServer.Management.HadrTasks)
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Jan 2, 2008
Hi there!
I use different udls for a website which is partly asp pages and partly aspx pages.
Every database is mirrored, so each udl indicates a "failover partner". However we decided recently that one of the database would not be mirrored anymore. For this database we still use in the udl a "failover partner" to redirect the connection to the second database in case of a failover. For the asp pages the failover works fine even if the database is not mirrored, but it doesn't work for the aspx pages.
It would be great if anyone had an idea why the behaviour is not the same for the aspx pages, and if we can still use a "failover partner" in udls even if the database is not mirrored.. if not, what should we use to connect to another database?
Any help is welcome!
idel
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Sep 13, 2006
How do I test failover to point to the mirrored database instead of the principal without having to stop the primary instance? I would like to just bring the mirrored database on the primary instance to an offline status and see that the same database on the mirrored instance getting activated as the primary. This does not happen if I try to put the database on the primary server "offline" as it complains that any database that is being mirrored cannot be taken offline.
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Feb 9, 2007
Our reports are connecting to a database snapshot for their data. Periodically this snapshot loads, which means for a minute or two the reports go down. There is however another snapshot available, and between the two one will always be up. Is there a way with Reporting Services to dynamically switch between the two, depending on which one is up? These snapshots are on a constant schedule, so it would also acceptible (but not as nice), to have the database connection automatically switch at certain times of the day.
These snapshots are on the same server, or I would try using a failover partner in the connection string. To the best of my knowledge, this only switches servers, not the database instances.
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Sep 5, 2007
We're planning on moving some applications to a SQL server. We're likely going to go with 64-bit for obvious reasons. Since these are critical apps, we plan on having a failover cluster set up. We're aware that all nodes in the cluster have to be 64-bit, if that's the way we decide to go.
The question is this: is there any "non-standard" way to have a 32-bit failover solution, perhaps via a 3rd party application? The only reason we're considering this is from a budget standpoint.
"Hurricane" Andrew
Milford, DE
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Jun 7, 2006
Hi,
I have successfully set-up a DB mirroring. When the pricipal goes down, the mirror picksup and the other way around too. So the mirroring part is working great. However, when I use my web applicaiton (dot net 2.0), it is not able to connect to Mirror server. I get the following error:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
My connection string in web app:
"Server=serverAAA;Failover Partner=serverBBB;Database=TestDB;User Id=testUser;Password=testPassword;"
I have checked the surface are config on "serverBBB" and it is set to use tcpip only for remote connections.
Any suggestions are higly appreciated. TIA.
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Jan 23, 2007
I have to figure out a way to handle a failover in SQL Server 2005. I was reading a few articles about it.
1. Do I need to do anything in application layer to let a failover occur in SQL Server 2005
2. I have a web site that connects to a production server, the connection string is defined in web.config. If I implement Mirroring in SQL Server 2005, and when failover occurs, shouldn€™t I change the connection string to point the application to the new server?
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Jan 25, 2007
Hi there,
We've recently set up a Principle, Mirror and Witness configuration with the Mirror and Witness in a separate building to the Principle. All three are part of the same domain (DMZ) and are different servers, the buildings are connected via a fiber optic cable. All servers and SQL Server instances are logged in with the same domain admin account DMZesAdmin.
Mirroring is all set-up and the databases are synchronized. Every once in a while some (not all, normally 6 out of 15) databases will switch roles and become active on the mirror. The SQL Server mirroring monitor job then reports:
Date 25/01/2007 12:37:01
Log Job History (Database Mirroring Monitor Job)
Step ID 1
Server DMZSQL01
Job Name Database Mirroring Monitor Job
Step Name
Duration 00:00:02
Sql Severity 16
Sql Message ID 32038
Operator Emailed
Operator Net sent
Operator Paged
Retries Attempted 0
Message
Executed as user: DMZesadmin. An internal error has occurred in the database mirroring monitor. [SQLSTATE 42000] (Error 32038). The step failed.
I have no idea, what causes the failover, it could be a slow network or a bad set-up, can anyone give me some ideas of what to do to track down the problem or any experience of what could be causing this, it happens randomly every day or three. No warning and if I go to the mirror and failover back to the principle again then it's all just fine. However I don't want half my databases working on 1 server and half on the other.
Any ideas?
Thanks
Ed
UPDATE:
I've just been looking at the logs on my Mirror and at the same time it reports in this order
Error: 1479, Severity: 16, State: 1.
The mirroring connection to "TCP://DMZSQL01.dmz.local:5022" has timed out for database "WARCMedia" after 10 seconds without a response. Check the service and network connections.
Database mirroring is inactive for database 'WARCMedia'. This is an informational message only. No user action is required.
Recovery is writing a checkpoint in database 'WARCMedia' (41). This is an informational message only. No user action is required.
The mirrored database "WARCMedia" is changing roles from "PRINCIPAL" to "MIRROR" due to Failover.
Database mirroring is inactive for database 'WARCMedia'. This is an informational message only. No user action is required.
...
This looks like a time out, is there any way to set the TimeOut threashold for Database mirroring or set retry intervals??
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Feb 29, 2000
We need to start testing our Microsoft cluster servers.
Has anyone heard of any plan or products one can use to test
the failovers?
Please advise
Thanks
Susan
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Jul 16, 1999
I need to know if there are any other failover options available for SQL Server/NT, beyond Microsoft Clustered Services. If there are any, which ones are advised?
Thanks,
Jon
jon_waldow@emeraldsolutions.com
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Sep 24, 2002
Hi all,
We are the studying the possibilty of implementing SQL - Clustering for
Failover server.
Are there any third party tools readily available.
Any suggestion or checklist ??
Any suggestions or comments will be appreciated.
Thanks and have a great day.
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