Failover Configuration
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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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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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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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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Sep 22, 2007
I am getting following error when trying to install SQL express 2005 on XPSP2.
TITLE: Microsoft SQL Server 2005 Setup
------------------------------
The SQL Server System Configuration Checker cannot be executed due to WMI configuration on the machine SIGMA-805539A79 Error:2147944122 (0x800706ba).
For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft+SQL+Server&ProdVer=9.00.1399.06&EvtSrc=setup.rll&EvtID=70342
I tied re-installing WMI using http://blogs.msdn.com/jpapiez/archive/2004/12/09/279041.aspx link but could not get it working.
Do i need IIS installed? Its not installed on this box...
please suggest something... i am stuck...
Thanks,
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May 2, 2007
I have just finished installing SQL 2005 Ent Edition on Win 2000 Adv Server, SQL2005 SP2, and SP2 Hotfix KB934458. After the installation, I could see and configure all services via SQL Configuration Manager and SQL Server Surface Area Configuration tools. This worked for a couple of days and now both configuration tools no longer detect SQL2005 components. SQL Server Surface Area Configuration issued an error that said "No SQL Server 2005 components were found on specified computer. Either no components are installed, or you are not an administrator on this computer. (SQLAC)". SQL Configuration Manager did not list any installed services. I don€™t know what caused this. Anyone has any idea? Please help! Below is the Installation Report which shows installed components.
===================================
The following components are installed on this server
DEV
Analysis Services
[Version: 9.2.3042.00 Edition: Enterprise Edition Patch level: 9.2.3054 Language: English (United States)]
Database Engine
[Version: 9.2.3042.00 Edition: Enterprise Edition Patch level: 9.2.3054 Language: English (United States)]
Reporting Services
[Version: 9.2.3042.00 Edition: Enterprise Edition Patch level: 9.2.3054 Language: English (United States)]
QA
Analysis Services
[Version: 9.2.3042.00 Edition: Enterprise Edition Patch level: 9.2.3054 Language: English (United States)]
Database Engine
[Version: 9.2.3042.00 Edition: Enterprise Edition Patch level: 9.2.3054 Language: English (United States)]
Common components
Integration Services
[Version: 9.2.3042.00 Edition: Enterprise Edition Patch level: 9.2.3054 Language: English (United States)]
Notification Services
[Version: 9.2.3042.00 Edition: Enterprise Edition Patch level: 9.2.3054 Language: English (United States)]
Workstation Components
[Version: 9.2.3042.00 Edition: Enterprise Edition Patch level: 9.2.3054 Language: English (United States)]
===================================
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May 23, 2006
Hi --I was wondering if this is a bug when I add new data in my table SSIS Confiurations and give wizard a new Configuration filter the package configuration wizard can not see the new values --the old values from the previous configuration are still showing---is there any known workaround or forced refresh I can do
thanks in advance Dave
Background:
SQL Package Configurations are most important because they provide the possibility of a central configuration store for your entire enterprise!!!!!!!! and is in my mind the only way to go
http://sqljunkies.com/WebLog/knight_reign/archive/2005/01/24/6843.aspx
Wizard results:
Name:
ETL
Type:
SQL Server
Connection name:
ETLConfiguration
Any existing configuration information for selected configuration filter will be overwritten with new configuration settings.
Configuration table name:
[dbo].[SSIS Configurations]
Configuration filter:
PT_CUST_ABR
Target Property:
Package.Variables[User::gsPreLoad].Properties[Value]
Package.Variables[User::gsPostLoad].Properties[Value]
Package.Variables[User::gsLoad].Properties[Value]
Package.Variables[User::gsFlatFilename].Properties[Value]
Package.Variables[User::gsFileName].Properties[Value]
Package.Variables[User::gsCDOMailTo].Properties[Value]
Package.Variables[User::gsCDOMailSubject].Properties[Value]
Package.Variables[User::giRecordCount].Properties[Value]
Package.Variables[User::giFileSize].Properties[Value]
Package.Variables[User::giBatchID].Properties[Value]
Package.Variables[User::gdFileDateCreated].Properties[Value]
Package.Connections[MyDatabase].Properties[ServerName]
Package.Connections[MyDatabase].Properties[InitialCatalog]
USE [ETLConfiguration]
GO
/****** Object: Table [dbo].[SSIS Configurations] Script Date: 05/23/2006 13:34:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[SSIS Configurations](
[ConfigurationFilter] [nvarchar](255) COLLATE Latin1_General_CI_AS NOT NULL,
[ConfiguredValue] [nvarchar](255) COLLATE Latin1_General_CI_AS NULL,
[PackagePath] [nvarchar](255) COLLATE Latin1_General_CI_AS NOT NULL,
[ConfiguredValueType] [nvarchar](20) COLLATE Latin1_General_CI_AS NOT NULL
) ON [PRIMARY]
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Jan 14, 2006
It seems to me, that the best way is to have one Environment Varible containing the name of the SQL Server, so that you can look up the configuration in the SSIS Configuration Table when you run the package.
Is this the preferable way of doing it ? I would like to hear some positive/negative comment of why chosing a configuration type instead of another.
It seems to me that putting all of the configuration in the Environment variable is harder work but most secure (server breakdown vs table corruption/database error...)
Let's have some comments
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Mar 6, 2006
Hi Guys,
Here's the current scenario:
I am creating a windows application to manage my ssis packages.
My SSIS packages use package configurations, and by default connect to the "SSIS Configurations" table in sql server.
However, I want it to connect to a view instead of this table, so i create a view "vwSSIS_Configurations" and point the package configuration to use the view in sql server.
The application SHOULD be capable of altering the package configuration's configuration and switch its connection between the default "ssis configurations" table, and the view.
Is this possible? I cannot think of a way which I can have my application switch the package configuration's connection.
Thanks,
kervy
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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 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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Dec 13, 2004
Question(s):
If you are using Legato to mirror your database server are you running any specialized scripts against the system tables at failover time? Are you running any kind of script at failover?
Background:
We are using Legato to mirror several of our critical database servers and it’s really worked well for us but a situation occurred last week that causes me some concern and I’d like to know what other Legator users are doing.
Normally our failovers are for short durations, a few hours at most. This time the failover occurred over several days. I found that any job that executed a step with a DTS package was failing.
It seems that there’s a documented issue from Microsoft, that when the originating_server column in the sysjobs table contained a value other than the name of the current server, the job fails. The fix was simple. I changed the originating_server name to the current server and all was well. When we went back to the primary server, I changed the value back again.
This brings me to the question about any special scripts or processes that you may be running at failover time. Any information you share is greatly appreciated.
Sidney Ives
Database Administrator
Sentara Healthcare
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Feb 15, 2006
This one is a needle in the haystack. I have a fairly robust Dell server running WIn 2003, 16 gig of memory, SQL SP3a using log shipping failing over to a local server and then back to my location across a WAN, using a vb6 app with about 60 users, a 24X7 shop Mon-Sat. 2 times in the past month the production server has created a corrupt log ship file which gets applied to my failover server and then corrupts the failover DB to both failover servers. Of course it is my 20 gig db and the only time I can recreate the failover is Saturday night. The production DB is not corrupt and is fine. Has anyone ever run into this before. Currently working with MS and Dell, but hoping someone had experience with this !
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Mar 10, 2014
If I have multiple servers in my AG group and set two of the secondaries to synchronous with auto failover, how do I control which one one of the two secondaries will become primary if the original primary goes down?We need to maintain HA even during patching so need a first choice auto failover and a second choice auto failover.
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May 13, 2008
Hi all,
Is it possible to setup auto-autofailower on 2 servers? Do i need to setup a witness on each server or what?
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Jun 5, 2008
Dear All,
we have one production server and continuously getting the data from application.
we have replication server with transactional replication for the main database.
so, for taking the data, we are using prod server, and for fetching the data, we are using replication server.
now what i'm expecting from you is, if something happend to the main server, there is no cluster except backup. what is the best plan for this?
and one more thing, if replication server fails, then the application will not fetch the data then what is the plan for this?
please give me a good plan for this kind of strategy.
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Aug 30, 2007
I'm sure this has been discussed in the forums before, but I'll ask anyways. I'm replacing our GP server next year to one that will run SQL2k5 64-bit. The current server is only capable of 32bit SQL. I know with some databases changing from x64 to x32 is a bad idea...will SQL Server support it?
Thanks
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Apr 23, 2007
We are running on SQL 2000 on Windows 2003. We have active-passiveclustering set up. We have 16 GB of RAM on each box. This pastweekend, we failed over. I noticed that the Total Server Memory wentfrom about 15.5 GB to 8 GB. I have been trying to figure out why thishas occurred. Any help would be greatly appreciated.
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