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?
View 6 RepliesI 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.
Looking for info on ole/requirement of primary and secondary replica under SQL Server 2012 AlwaysOn.
View 4 Replies View RelatedI 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?
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 ?
I have 3 synchronous AlwaysON replicas: A, B and C. A is primary, B and C are secondary and both are set to Automatic recovery. How can I understand, which of them (B or C) will become primary when A goes offline? Well, Actually my final DB system should support following configuration:
1) Normally - A is primary B and C are sync secondary.
2) if A fails, B automatically becomes primary, C remains Sync secondary.
3) if A goes online, it becomes primary again
4) C becomes primary only after A and B fail (and there still should be cluster quorum!)
As I understood, first of all i should configure quorum the following way: A-0, B-1, C-1, folder-witness-1.
The problem, again, is: I cannot understand how to configure which replica becomes primary when AG fails over.
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" ,
View 3 Replies View RelatedMSDN 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?
SQL is generating dump every 1 min with error
EXCEPTION_ACCESS_VIOLATION reading address 0000000000000020 at
Server is running SP2 CU2.
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?
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?
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?
View 3 Replies View RelatedWe 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
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.
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?
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.
View 5 Replies View RelatedI 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.
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?
I'm new to Sql Server and want to install SQL server alwayson clustering on my test environment. I followed the steps by this site: [URL] ....
On each node I can connect to SQL Server but why my 2nd node is not available so that I can add it as my 2ndary Replica?
According to this site, till "Always-On Availability Group Configuration" everything was successful.
I have Active Active Cluster with 2 nodes , on the first node I can execute the queries, but when I trying to execute query or just open a DB to see the tables I getting error:"The Database XX is not accessible. (ObjectExplorer)".
View 5 Replies View RelatedTrying to add a second replica to my SQL 2012 AG. for some reason i cant click the next button.
View 3 Replies View RelatedI'm getting an error adding Replica to SQL AlwaysOn failover cluster in the new availability group wizard. When I enter the name of the target node (secondary replica) server and press connect, I get the following:
A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2) The system cannot fine the file specified
The SQL Browser service is up and running on the target. I am using an Azure VM for my SQL instance. This cluster spans geographies from our on-premise site to Azure via a VPN. This is a multi-subnet cluster. I'm attempting to create a new AG from the primary replica node and the target is a node on Azure called SSASNodeAz03.
[URL]
Full error:
Connect to Server
Cannot connect to ssasnodeaz03
Additional information: A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2) The system cannot fine the file specified
We have a SQL AG configured with 3 servers. 1 Server is on Azure Cloud and 2 are On Prem. The one on Azure is the Primary DB [Copy]. The copies on On Prem are secondary.Databases are more than 6 TB in total. We have already synced 1 copy [One SQL Server] OnPrem with Azure DB. The connection was over a VPN tunnel so it took a almost 8-10 days.. Some failures in between.Now, can I sync my other SQL 2012 server OnPrem with the secondary copy.
View 5 Replies View RelatedWe have an AAG environment. In order for the failover to be transparent we have to ensure that the login that is added in the Primary node is also added to the secondary node. Currently, we are adding the logins to the secondary node manually. Is there a way to automate this process so that a Login added to the Primary node is automatically updated on the Secondary Node.
View 4 Replies View RelatedHow can I keep a production SQL server and DR SQL server in sync? I'm not referring to data - I can use SAN replication for that. I'm referring to the many configuration settings and objects that are external to the databases..Server settings (xp_cmdshell, etc.)LoginsServer- and database-level rolesServer- and database-level permissionsObject level permissionsMaintenance plans/SSIS packagesSQL Agent jobsJob schedulesDatabase mail configurationObjects (proxies, alerts, credentials, operators)Linked serversScheduled tasksODBC connections
I realize that many of these items can be scripted out, and periodically run on the DR server; but not all of them can be. And some, although they can be scripted, may be problematic to restore on a DR server, such as SQL Agent jobs. And even with backup scripts, it seems like developing a process to refresh a DR server would be overwhelming given the number of elements and exceptions. I'm not adverse to doing the work to create a completely scripted solution, but was curious if one already exists that handles all or most of the elements in my list.
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.
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.
Currently in my environment we are using SQL server 2012.We setup Alwayson with synchronous commit.Details of existing AlwaysOn: one primary and two secondary.
Primary: On-Premise server.
Secondary1: On-Premise server.
Secondary2: Azure VM.
Requirement: We need to add Secondary3 New Azure VM on same AG with asynchronous mode or synchronous mode.
Or
We need to create one more AG on same DB and add the new replica with asynchronous.Is it possible above 2 option in this scenario? My cluster environment is Manual failover only not auto failover.
Hello,
I would like to know how do I carry out this two cases in efficient way:
1. I have two SQL 2005 servers running. One as primary, one as secondary. I would like to synchronize or replicate the transactions at real-time.
2. When primary goes down, I would like my secondary server to take place in needless of IP changes and application settings.
If you have a good architecture on this, please share with me. I am not sure whether my questions are clear enough or not. I also will be reading some articles about these. Thank you in advance.
Regards,
Paing
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.
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.
View 4 Replies View RelatedI 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?
View 6 Replies View Related"If we fail over a SQL AG group on a failover cluster from one node to another making the secondary the new primary, is there any reason why we would have to fail it back over to the old primary node?"
View 2 Replies View Related