SQL 2012 :: AlwaysOn Secondary Replica - Resolving State

May 21, 2013

I have an AlwaysOn Availability group configured between 2 nodes (Synchronous)

Automatic failover was working fine until recently

I can failover between the nodes manually but automatic failover doesn't seem to be working. In my earlier test, I would shut down the SQL Service on the primary and within seconds, the secondary replica would take over. Recently I have performed the same test and the secondary replica enters the resolving state and the DB in unavailable.

I have tried everything here: [URL] ....

The only change I made was changing the availability mode from Synchronous to Asynchronous - Could that be the cause?

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SQL 2012 :: Clustering AlwaysOn - Primary And Secondary Replica

Apr 11, 2014

Looking for info on ole/requirement of primary and secondary replica under SQL Server 2012 AlwaysOn.

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SQL 2012 :: Failover On 2 Servers AlwaysOn AG With Read-only Secondary Replica

Mar 28, 2014

What happens when an automatic failover occurs, in a two server AlwaysOn Availability Group configuration, where the secondary replica is configured as read-only?

Will it only allow read-only connections, or will it become read-write and can accept INSERT, UPDATES and DELETES when assigned the new role as Primary?

Is it correct that adding a third server/node, that just acts as passive and should be used for automatic failover, to support true HADR, would NOT need another license .. and that licenses would only be required for the previous Primary and Secondary (Read-Only) replicas?

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SQL 2012 :: VLFs On AlwaysOn Primary Replica After Log Backup From Secondary

Aug 6, 2014

I was working on a job to send me info each morning about database file free space and was noticing some odd things when looking at the log file VLFs for one of my databases in an AlwaysOn availability group.When I run DBCC LOGINFO on the secondary replica for this database, I get what I expect and most VLFs have a status of 0 (indicating the VLFs are reusable or unused). When I run DBCC LOGINFO on the primary replica, all of the VLFs have a status of 2 (active or recoverable).

Since log backups on the secondary replica in AlwaysOn still truncate the log in the primary replica, I would expect that the VLFs in the primary replica would also be mostly in a reusable or unused state. My log file sizes are the same size on each server and my backups are completing successfully. what might be causing the VLFs on the primary replica to have a status of 2 in DBCC LOGINFO when taking log backups from the secondary replica?

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SQL 2012 :: Backup On Primary Replica In Case Of Secondary Replica Is Down

Jun 9, 2014

I have 2 SQL Server replicas configured on SQL Server 2012 AlwaysOn. e.g. SQL1 & SQL2.

I have configured backup job on both SQL Server with the following statement. and the job occurs every 10 minutes.

•declare @DBNAME sysname,@sqlstr varchar(500)
set @DBNAME = 'dba'
IF (sys.fn_hadr_backup_is_preferred_replica(@DBNAME)=0)
BEGIN
--Select 'This is not the preferred replica, exiting with success';

[Code] ...

I turned off SQL2 for Windows maintenance. So there is only SQL1 is online. Afterwards. I checked the backup folder and didn't see any new backup files was created after SQL2 was offline. I rerun the job. It still doesn't backup database on the Primary Replica. Then I searched on SQL Server Book online. It says

Prefer Secondary

Specifies that backups should occur on a secondary replica except when the primary replica is the only replica online. In that case, the backup should occur on the primary replica. This is the default option.

According to what it says, it should backup on the Primary Replica.

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SQL 2012 :: AlwaysOn Availability Group Listener DNS Resolving To DR Node

Jan 19, 2015

We are rolling out the use of Availability Group listeners to our SQL Server 2012 Environment which has a 2 node multi-subnet cluster. The Primary is R/W and the Secondary is a non-readable node that would be manually failed over to in a DR scenario

I have set up the AGL and asked the sysadmins to create a DNS record in both subnets with fixed IP's.

The issue I have having is that when I ask the app developers to connect to the databases using the AGL it is totally random whether the AGL resolves to the Primary or DR node - as a result that are having problems getting their apps to connect.

I was thinking of asking the sys admins to remove the DNS record in the DR subnet and then add it back in should we need to fail over - but I was thinking there must be a better way.

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Recovery :: AlwaysOn DB Going Into Restoring State On Secondary Server

Jun 22, 2015

I noticed that after a SQL AlwaysOn failover, one of the DB in the secondary replica is stuck in Restoring state. The primary replica shows that it is in a synchronized state. These are the error logs from SSMS. How do I trace the cause of the problem?

Error: 5901, Severity: 16, State: 1.
Nonqualified transactions are being rolled back in database for an AlwaysOn Availability Groups state change. Estimated rollback completion: 0%. This is an informational message only. No user action is required
Error: 18400, Severity: 16, State: 1.

One or more recovery units belonging to database  failed to generate a checkpoint. This is typically caused by lack of system resources such as disk or memory, or in some cases due to database corruption. Examine previous entries in the error log for more detailed information on this failure.

The background checkpoint thread has encountered an unrecoverable error. The checkpoint process is terminating so that the thread can clean up its resources. This is an informational message only. No user action is required.

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Recovery :: AlwaysOn Secondary Operational State Unknown

Sep 30, 2013

I recently configured SQL Server 2012 AlwaysOn Availability group using two nodes - a primary and one secondary read only replica.  The group is residing on a windows 2012 cluster with an smb file share as the quorum.  I am able to successfully failover through SQL and through the windows 2012 cluster.  When I look at the group dashboard on the primary server and view the Operational state of each node I notice an odd value.  The secondary role server is listed as Unknown.  I also noticed that the Availability replicas node icons in object explorer are displaying the same icon on the primary server but on the secondary server, the primary server is shown as a server with a question mark.

Am I missing a permissions setting or is this normal behavior.

For example:

ServerA is the primary
ServerB is the secondary
ServerA  lists the servers in Object Explorer as:

ServerA (Primary)ServerB (Secondary)
ServerB  lists the servers in Object Explorer as:

ServerA ServerB (Secondary)

The primary is never listed a primary on the secondary server.  Again failovers are working properly, but I want to be sure I am not missing a setting somewhere.

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SQL 2012 :: Secondary Replica In AG

May 27, 2015

in my secondary server the database which is in restoring state , when i checked in always on dash board "This secondary database is not joined to the availability group" ,

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SQL 2012 :: Dump Every 1 Minute In Secondary Replica?

Jun 9, 2015

SQL is generating dump every 1 min with error

EXCEPTION_ACCESS_VIOLATION reading address 0000000000000020 at

Server is running SP2 CU2.

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Replication :: Remove Secondary Available Replica From 2012?

Oct 14, 2015

Environment:-

Windows 2012 R2,
SQL 2012 (Primary Replica)
SQL 2012 (Seondary Replica)
SQL 2012 (Secondary Replica over WAN site)

There are database replicating on three SQL servers. WAN line is having performance issue because of limited bandwidth I have to remove SQL secondary replica over WAN site temporarily and add it again later when the WAN line is upgraded with between bandwidth What is the best practice to remove secondary replica and replicating database and add later from SQL management studio without interruptions on databases?

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SQL 2012 :: How To Change Backup Replica In AlwaysOn Cluster

May 6, 2014

How can we change the backup replica in Always on Cluster. I am not able to take backup because of this.

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SQL 2012 :: AlwaysOn Async Replica Back To Sync

Aug 19, 2014

After failing over to the DR replica. All databases are out of sync. DR replicas were setup as async the other 2 are set up as sync. Is this by design. No data has been updated to any of these as they are test dbs. So all dbs should be the same, no data loss.

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SQL 2012 :: AlwaysOn Two Secondary Replicas

Apr 14, 2014

While configuring SQL Server 2012 Cluster with Always on, why do we need two secondary replicas.

The attached link will describe the actual query. [URL] ....

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SQL 2012 :: AlwaysOn Availability Group Replica Ends Up With User Account As Owner

Sep 5, 2014

Setting up a test AlwaysOn Availability Group for one database.

However, whenever I restore the database to the replica server and join it, it ends up with my user account as the owner of the database.

Obviously I do not want a user account as the database owner, but since it is read-only I cannot modify it directly. If I were able to fail the AG over to the replica, I could change the owner then, but I cannot due to business requirements. this AG is to essentially serve as a replacement to log shipping.

I tried doing the backups and restores using EXECUTE AS login = 'sa', and yet it still shows up as my user account.

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SQL 2012 :: AlwaysOn - Readable Secondary Option

Aug 21, 2014

In always on under availability group server name properties can see the option Readable Secondary. In that for secondary server the Readable Secondary Option is YES and for Primary it is Read-Intent. I believe Read-Intent allows only read only connections and YES allows all user connections.

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SQL 2012 :: AlwaysOn - Readable Secondary Options

Aug 21, 2014

In always on under availability group server name properties can see the option Readable Secondary. In that for secondary server the Readable Secondary Option is YES and for Primary it is Read-Intent. I believe Read-Intent allows only read only connections and YES allows all user connections.

What exactly it means for the primary and secondary?

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SQL 2012 :: AlwaysOn Secondary Node Slower Than Primary

Oct 3, 2014

I have a SP that runs on the primary in 18 min and 45 min on the secondary( poorly written cursor,trying to fix it).Both machines are Exactly the same.I ran them in the middle of the night when no one was on the Sec. Node as we use it for reporting.

PLE: 7,000+
AVG Disk sec/write below .01
AVG Disk sec/read below .01
CPU below 5%
both machines set a max dop 4

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SQL 2012 :: AlwaysOn Secondary Database In Restricted Mode?

Jun 27, 2015

Secondary replica database(setup in async mode) of AlwaysON went in "restricted mode" during weekly reindex operation.

So I have tried below steps

1) Executed following statement on the same secondary replica database where the issue exists

alter database <DBNAME> set multi_user with rollback immediate

but it failed with the error saying "The operation cannot be performed on database "dbname" because it is involved in a database mirroring session or an availability group. Some operations are not allowed on a database that is participating in a database mirroring session or in an availability group. ALTER DATABASE statement failed."

2) Primary database is multi_user but still tried following command on primary replia database(thinking it will replicate)

alter database <DBNAME> set multi_user

but no luck. The secondary alwaysON database shows (synchronizing) as the alwaysON is set in async mode but the command doesn't replicate across secondary

so we are left with the only option to re-setup alwaysON but I want to avoid it as database size is huge..

any other options or am I missing anything?

MCP,MCDBA(SQL 2000),MCTS(SQL 2005),MCITP(SQL 2005)

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SQL 2012 :: Does Secondary Replicas In AlwaysOn Have To Reside In Windows Cluster Servers

Sep 18, 2014

I know now that AlwaysOn feature HAS to be installed/configured on a Windows Clustering environment, BUT the secondary replicas, like the Disaster recovery replica residing in a different Data Center HAS to be also in a Windows Clustering environment or can it reside on a SINGLE SQL Server INSTANCE?.

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SSIS CDC Components On Asynchronous Secondary Replica

Jan 15, 2015

MSDN states the following on: Readable Secondary Replicas (AlwaysOn Availability Groups) for SQL Server 2014:

Limitations and Restrictions:

Change tracking and change data capture are not supported on secondary databases that belong to a readable secondary replica:

Change tracking is explicitly disabled on secondary databases.
Change data capture can be enabled on a secondary database, but this is not supported.

This confuses me: You can not track the changes. However you can enable CDC?

The scenario I am trying to achieve is to use SSIS CDC components on an asynchronous secondary replica. Is this possible? If not what would be other viable approaches?

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How Many Databases Can Add In AlwaysOn Replica

May 14, 2015

is there any limition in AlwayOn to add database in secondary replica?

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SQL Server Admin 2014 :: Read Only On Secondary Replica

May 5, 2014

Assume if i have a connection(Application intent readonly) starts with reading, writing and again reading data for a report. how it will works in SQL 2014 Always availability on?

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SQL Server Admin 2014 :: Cannot Failover AG To Secondary Replica

Aug 11, 2015

We are not able to failover the AG to secondary replica. The process gets timed out and AG goes to resolving mode. Had to reboot the box in order to switch the AG back to primary node. We even rebuilt the whole AG from scratch but the issue remains.

Failed to bring availability group 'xxxx' online. The operation timed out. Verify that the local Windows Server Failover Clustering (WSFC) node is online. Then verify that the availability group resource exists in the WSFC cluster. If the problem persists, you might need to drop the availability group and create it again. [SQLSTATE 42000] (Error 41131). The step failed.

Not much information is available in the logs.

Version : sql server 2014 sp1

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DB Engine :: Table Triggers On Read-only Secondary Replica?

Jun 30, 2015

I was hoping for some information regarding table triggers. We have databases that are part of an AlwaysOn availability group on SQL Server 2012. Some of the tables have table triggers defined. There are both types of triggers, INSTEAD OF and AFTER INSERT, etc.

From my understanding of how secondary read-only replicas work, I am assuming that these triggers have no impact at all when the database is a read-only secondary replica and they only fire when the database is the primary read-write database.

However, after doing a search on the internet, I have not been able to find a definitive source of information.

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Recovery :: Set Synchronization Time From Primary To Secondary Replica

Sep 28, 2015

As per our client requirement we want to set synchronization time from primary replica to secondary replica after 20 minutes. Is it possible in MSSQL AlwaysOn Availability Groups in SQL Server 2012?

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SQL Server Admin 2014 :: Can Have Secondary Replica As Read / Write Mode?

Oct 14, 2014

We have a reporting database which is refreshed daily from prod backup and later creating new tables/views/indexes as part of the refresh job. Is there a better approach we can implement in sql 2012/2014 for this scenario since we are planning to migrate to sql2014.

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SQL Server Admin 2014 :: Joining DB On Secondary Replica Resulted In Error

Oct 12, 2015

I am working on adding DBs to the AG but for some reason I am getting this error.

"Joining DB on secondary replica resulted in error"

Msg: The remote copy of the database is not recovered far enough to enable DB mirroring or to join AG. Missing log records have to be applied to the remote DB by restoring the current log backups" Which I did. I took the log backup of DB1, restored it on DB2 with no recovery, but still I am getting the same error.

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Application With AlwaysOn Read Only Replica In Synchronous Commit

Mar 8, 2015

I am trying to implement a read only replica to move much of the data read for an application to the secondary replica. Initially I had the the primary and secondary set to asynchronous commit. QA brought up an issue with creating entities from the application because after the creation of an entity the application turns around and repopulates the entire aggregate object. Well it seems that the application was reading the secondary replica before the data had been committed. Although I understand the issues that synchronous commits can cause, I went ahead and made the change as I expected it to fix the issue. After changing the primary replica to synchronous we still had the error, so I also changed the secondary although that makes no since, but the issue remains.

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SQL Server Admin 2014 :: Set Up AlwaysOn Replica For Reporting

Jun 17, 2015

I would like to setup replica for one of the databases for reporting. The current environment is a 2 node cluster(active/passive). I would like to add a 3rd node that can server as a secondary replica. The secondary replica will be on asynchronous commit mode.

The database that needs to have alwayson setup has column level encryption enabled.

Other Questions,

* Do I need to backup and restore the service master key on secondary server in order to have the column level encryption to work on secondary server?
* What would be preferred Quorum settings?
* What is the setting for 'readable secondary' for primary and replica db?
* What should be the setting for 'Connections in Primary Role' for primary and replica db?
* We are trying to setup without a Listner. Do I need to setup AG Listener? Can the application exclusively use the [secondary instance name].[replica DB name] without a listener?

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SQL Server Admin 2014 :: Grant User Read Access To Secondary Replica?

Sep 15, 2015

I have 3 servers taking part in an AlwaysOn AG.

I want to grant a user READ access to only one replica, and certainly not to the principle.

How do I go about doing this?

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SQL Server Admin 2014 :: AlwaysOn Replica Database For Reporting

Feb 1, 2015

We have a 2 node clustered instance(SQL 2014) with 26 databases and we would like to enable alwayson for one of the databases for reporting (only one secondary and do not need high availability setup). I'm thinking if the reporting application/queries can explicitly connect to the secondary database(Instance namedatabase name) without using a listener and setup the secondary in asynchronous commit mode. Read about the REDO thread blocking due to reporting workload. How does this affect if I implement the secondary in this way.

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SQL Server Admin 2014 :: AlwaysOn Read-Only Replica Routing

Jun 22, 2015

Having an annoying AG/AO problem with the read only routing side of it.

Let me give some specifics first:

2 SQL Server Instances, Not Clustered.
Availability Group is named 'Ireland'

There is a primary Replica and a Secondary Replica, named:

'IrelandPrimary' and 'IrelandSecondary'

There is a listener configured with the name 'ListenIreland' on Port 14330 (the two 3's are correct)

Read Only Routing URLS are configured as follows:
IrelandPrimary tcp://Ireland.dom.local:49891ALL
IrelandSecondary tcp://Ireland.dom.local:49841ALL

So now my problem:

When I try to connect using the ApplicationIntent=Readonly; or even using -K ReadONLY in sqlcmd I get the error telling me that my connection was actively refused.

This is connecting to the Listener, not the instance itself - that works fine. I'm at a bit of a loss now.

To explain what I am trying to achieve is a for a connection to be redirected to the secondary replica when its set for read-intent.

I've just noticed that it only fails when I specify ApplicationIntent=ReadOnly; If I omit the Intent It connects to the read-write database instead.

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