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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Nov 21, 2007

Hi guys, right now I am having insufficient hard disc space at the secondary server (Mirror side) due to the large db that I have. Therefore, I get a new HDD on the server (Assuming located at drive G) and would like to shift the current mirroring db to that new drive. Is it possible for me to do that ? Hope able to get any suggestion from here ASAP. Thanks.

Best Regards,
Hans

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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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May 29, 2015

We have several Sql Server 2014 AlwaysOn Availability Groups set up in our test lab and use a combination of SCDPM and Maintenance Plans to back up the databases in them. 

Our applications always work well regardless of which of the physical servers are, at any given time, designated the "Primary" for a database.  Automatic failover works fine.

There are other applications, such as SQL Server built-in backup and System Center DPM that only work properly when the databases are currently hosted where originally intended.

During the normal course of Windows Updates, etc., machines will occasionally be rebooted in the middle of the night.  When they come back up, we would like them to "reclaim" the databases that properly belong to them, in an orderly fashion of course (when the "Synchronization State = Sychronized").  We have lots of these test servers and we do not have staff watching the servers in the middle of the night.

Is there an automatic way to accomplish this?

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Transaction Log Shipping Secondary DB In Restoring... State

Apr 23, 2008

I am new to this environment and was asked to ensure that the transaction log shipping for SQL 2005 on W2K3 boxes is working properly. I noticed the db's on the secondary server are show "Restoring..." I am not sure if these were set up in No Recover Mode or Standby Mode. I have no access to the secondary db's. I get an error message when trying to access them (error 927). Monitoring was not set up initially and as you may or may not know can't be turned on after the fact...unless you delete the job and start over.

My question is is "Restoring..." normal and what does it indicate?

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Nov 6, 2015

I have a two node HA Always on group using a Listener.  I would like to force a certain AD group to always be forced to the secondry node as they would only ever need to run select statements. If there an easy way to do this without using logon triggers?

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Secondary DB In &"Restoring...&" State

Apr 23, 2008

I am new to this environment and was asked to ensure that the transaction log shipping for SQL 2005 on W2K3 boxes is working properly. I noticed the db's on the secondary server are show "Restoring..." I am not sure if these were set up in No Recover Mode or Standby Mode. I have no access to the secondary db's. I get an error message when trying to access them (error 927). Monitoring was not set up initially and as you may or may not know can't be turned on after the fact...unless you delete the job and start over.

My question is is "Restoring..." normal and what does it indicate?

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Aug 17, 2015

We have a requirement to build SQL environment which will give us local high availability and disaster recovery to second site. We have two sites- Site A & Site B. We are planning to have two nodes at Site A and 2 nodes at Site B. All four nodes will be part of same Windows failover cluster. We will build two SQL Cluster, InstanceA will be clustered between the nodes at Site A Server and InstanceB will be clustered between the nodes at Site B, we will enable Always On Between the InstanceA and InstanceB and will be primary owner where data will be written on InstanceA and will be replicated to InstaceB. URL....Now we want we will have instanceC on the Site B and data will be writen from the application available on Site B, will be replicated to the instance on the Site A as replica.

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SQL Server Admin 2014 :: AlwaysOn Secondary Down -> Whole Cluster Goes Down

Oct 25, 2015

We had a big issue today during maintenance work in our SQL environment.

So our environment:
- 2x SQL Server 2014 Enterprise on Windows Server 2012 R2 (SRV1 and SRV2)
-- Both Hyper-V VMs on different Hosts
-- Both configured to an Windows Failover Cluster and AlwaysOn Availability Group (AG1)
-- AG Listener: AG1_lis
-- No shared storage (each Hyper-V Host has its own local storage)
-- Asynchronous Mode
-- SRV1 is primary, SRV2 is secondary SQL node

What happened?
- Shutting down Windows on SRV2 due hardware maintenance
- Cluster goes offline, AG1 goes offline
-- Error message: "Stopped listening on virtual network name 'AG1_lis'."
-- Error message: "The availability group database "DatabaseXY" is changing roles from "PRIMARY" to "RESOLVING" because the mirroring session or availability group failed over due to role synchronization."

Results?
- AG1_lis wasn't available for our applications and they stopped working properly because database connection was lost!

I think, I HOPE, this is not the normale behaviour when one node is shutting down (especially the secondary node!)

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Nov 12, 2014

Recently I have faced one DBA interview, below is the question they asked me.

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I know AlwaysON secondary replicas support only copy_only and tlog backups, why they wont support full backup?

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Hi,

I'm having trouble with restoring the master db on w2k3 sql2000 sp3a to a Secondary Standby server.
Firstly, I place the server in Single user mode and then restore the master db. The sql server then tries to restart sql services but immediately stops as soon as it starts up.

Can anyone help ?? Please !
Thx, Steve

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May 5, 2015

We tried to configure log shipping using script generated by GUI and when executed specific script which is meant for secondary server the database is not created and threw below error.

Msg 15010, Level 16, State 1, Procedure sp_add_log_shipping_secondary_database, Line 50

The database 'BUBALLO' does not exist. Supply a valid database name. To see available databases, use sys.databases. 

Note: Only Copy, restore and alerts jobs have been created.

The account I'm trying to configure log shipping is the service account by which SQL and agent services are running and folder in where data and log files are intended and to be created is open to all (everybody has read/write permissioins) believe the issue is not with permissions.

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Jul 30, 2015

I have a SQL 2014 SP1 set of servers with two asynchronous copies of an availability group.   One of the asynchronous sites is down and SQL can no longer replicate the changes. I need to understand how long SQL Server can continue this way before the secondary replica will no longer be able to catch up. I assume this is really tied to the transaction log on the primary replica but would like it clarified.

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Aug 4, 2015

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How to reset the logship back to normally, do I need to disable the jobs before proceed any operation!

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The Mirrored Server Is Always In The State Of Restoring Only

Jun 6, 2006

The database in Mirrored server is always in the state of restoring only.

the database in mirrored server is restored with norecovery

then we started mirroring.

the status of mirroring is successfull and is synchronized.

but the Mirrored server is always in the state of restoting

not allowing use to open the database.



could any one know why this problem is comming and give some solution for this problem so that the mirrored database can be accessible opened and queryed to really verfiy that the changes made in principal database is mirrored to Mirrored database.

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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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I have configured replication between Always ON Availability Groups  (Listener) (PUBLISHER), remote distributor to XYZ SUBSCRIBER...with above link ...

Now, I want to know how to replicate Data from XYZ SERVER a PUBLISHER to Always ON Availability Groups  (Listener) (SUBSCRIBER)? Distributor Database being on XYZEX:

XYZ SQL SERVER as PUBLISHER, and DISTRIBUTOR 
to 
Always ON Availability Groups  (Listener) SUBSCRIBER...

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Sep 12, 2015

We have 2 switch between primary and secondary this morning.

after that one database in secondary went to "initializing / recovery pending".

How can i exit from this situation ?

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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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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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Recovery :: AG Database In Reverting / In Recovery State

Nov 1, 2015

We have an issue with a 3 node SQL 2012 Always on availability group. Normal operation is node 1 (primary replica) with node 2 and node 3 as secondary replicas.After some patching, SQL wasn't running on node 1 hence the AG flipped over to node 2. This went unnoticed for some time and the transaction log for one of the AG databases became full on node 2 and node 3. (I think this is because it couldn't commit the transactions on node 1 so couldn't truncate it's t-log?) The DB is using synchronous replication btw.So I started SQL on node 1 and flipped the AG back to node 1 (with a data loss warning but I accepted this).Now the issue is that on node 2 and 3, the DB in question is stuck in a "Reverting / In Recovery" State. I've tried various commands such as ALTER DATABASE SET ONLINE, RESTORE DATABASE WITH RECOVERY etc but these fail stating unable to obtain a lock on the DB.

The weird thing is that on node 1 the state of the DB is "synchronised".how to resolve this issue on node 2 and 3? I've left them overnight (in case they were rolling back transactions, the DB is fairly large) but nothing seems to have happened. remove the DB from the AG in node 2 and 3 and add it back in again, ie recreate the replication?

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I am using SQL server 2012 with Always On High Availability feature. I am not able to set the recovery mode from Full to Simple as it gives me message that mirroring is running on both server.

In my case to reduce the log file what I need to do.

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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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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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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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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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