SQL Server Admin 2014 :: AG Failover To Async Node - Replication
Sep 29, 2015
if for any reason AG fails over to async node, how replication behaves? As data will not be in sync with previous primary replica, how replication will work? I think that we have to reset replication from scratch as there's a high chance subscribers might be more updated than current primary replica as failover to this node causes data loss. How to keep replication in sync without resetting up? Can we achieve this?
I am running SQL 2014 2-node AlwaysON Availability groups, Enterprise Edition in our environment and 5 databases are part of AG.
Question is, sometimes AG is getting failed over to node2 but always our preferred node is node1 due to some business needs otherwise some of our jobs will fail.
So, what I looking for is, a sql script which can handle a situation wherein, for some reason, AG is failed over to node2, it should be able to detect if node1 is back online or not and if so, it should fail back to node1. How to do this using tsql query or stored proc or sql agent job ?
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.
I have 10 databases which are configured as principal in mirroring I need to failover all the databases as part of failover , instead of writing query each database as parner failover, is an script which will generate the databases as principal to failover ?
When I setup my listener: ListenerA...Do I need to use the instance name in it?
ListenerAInstance01 or ListenerAInstance02 depending on which SQLNode is the "active" availability group?
Am I better off to use the same instance name for both nodes, since my goal is to have all databases on both instances in the same availability group and sync'd? When SQLNode1 migrates over to SQLNode2 I will need to update the instance name in my connection string on the listener from ListenerAInstance01 to Instance02? When I connect with SSMS do I just use: ListenerAInstance01 (or 02)?
I have installed 2 node windows Fail-over clusters successfully. But QUARUM Configuration is not appearing in Failover cluster manager instead "Witness: Disk (Disk Cluster 4)". I have also configured quarum configuration from Quarum "Configure Cluster QUARUM Settings". I have attached the snapshots of windows cluster configuration. Is it the issue or not. I have not got any warning and error during cluster validation while installing Windows failover cluster. I am assuming it is okay and i can move ahead to installation of SQL Failover cluster setup.
Products used for installation in Virtual Machine: Windows Server 2012 R2 SQL Server 2012 R2 Note: Service Pack is not installed.
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.
Recently after turning on trace I restarted the sql services on a box which is configured for automatic failover availability groups. The ag has not failed over to other node. The other node was in resolving state. When the restarted server is back, the AG went back to that server. I checked the sys.availability groups field for failover property failure condition level, it's set to 1 which means service restarts should initiate the failover.
-MS Server 2012 R2. -SQL 2014 EE. -All windows updates. -Clean install of both OS and SQL, all 3 nodes are identical. -SQL Server is running on an alternate port, which I've opened in the firewall. Connections from all network locations are working swimmingly; including connections between all 3 nodes. -I've got the groups up and running; Listener is set up correctly. Connections work great. -One node is synchronous, one is asynchronous. Both show synchronized, and synchronizing respectively. -Data added at the primary node is moved across to all 3 with lightning speed.
When I attempt a manual failover it hangs..and hangs...then pops up an error 41131 and rolls back the failover. Leaving the cluster perfectly intact and working just as it did prior to the failover attempt. What I've checked so far:
-There is absolutely NOTHING in the cluster events log. -Windows event log shows no errors, just the standard stuff of the primary nodes state changing from primary to resolving and then back again. -SQL Event log has a few things in there, but nothing that's leading me to a solution, I've attached the log from start to finish on an attempted manual failover:
Is there any single TSQL query which provides below info.When did my AlwaysOn Availability group failed over and from which node it failed to which new node(i.e. replica)?
I have been facing following Error in Failover cluster setup as below. I have prepared 2 node and 2 instance sql server failover cluster on top of windows failover.I have deleted MTCBJINS07 in AD and recreated even after, problem is not solved. MTCBJINS07 is my 2nd sql instance sql server network name.
Cluster network name resource 'SQL Network Name (MTCBJINS07)' failed registration of one or more associated DNS name(s) for the following reason:
DNS bad key.Ensure that the network adapters associated with dependent IP address resources are configured with at least one accessible DNS server.
I have a 3 node 2014 AlwaysOn setup. The primary and secondary are set for automatic failover. The third node, of course, is manual (until 2016). The 2 nodes with are automatic are sitting in one datacenter, the third is in another. If the first datacenter was to go down, I would manually have to failover to the third node? What's the normal process here for having two datacenters and ensuring the availability group is always available?
Currently - we have two-node A/P cluster residing on flash array. Need to leverage AlwaysOn to offload processing. Replica server with have Flash storage. Replica node has same CPU and memory footprint. 10GB connection between nodes. Anyone generating such large transaction log for 15/30 minute time period?
We had to failover our primary db server for maintenance to our secondary replica. The primary was rebooted during maintenance. We failed back after the maintenance and one of the databases is not synchronizing.
I checked sys.dm_hadr_database_replica_states, and it is showing that it is INITIALIZING.
It has been in this state for more than 45 mins now. The last_sent_time, last_received_time, last_hardened_time and last-redone_time are all stuck with a time stamp 45 mins ago.
They haven't changed. How do i resume this database and bring it back in sync?
I tried suspending and resuming the data movement, but hasn't worked.
I Run All checks for Validation cluster.I get Error On Disk Lists And Validation failed.With This error : Failed to prepare storage for testing on node "server name" The security account manager (SAM) or local security authority (LSA) server was in the wrong state to perform the security operation.
I have a 2 node cluster with 2 standalone 2k14 instances having alwayson setup. As per client requirement we have created a client access point with a cname alias in dns to connect to secondary replica. Now, everytime whenerver the roles switch over one has to manually move this resource from the previous secondary node to the new secondary node. This is tedious, and should not be done manually either, so I am looking for a way to automate it so that as soon as the role switches over, the resource group after some time should also switch over to the current secondary.
We have installed 2014 sql server. We have currently 2008r2. We have to run the real time report. So we need to set up transactional replication b/n those two servers. We need to use 2008r2 as publisher and 2014 as subscriber.
Is it ok to have subscriber higher version than the publisher?
Any experience of success or failure setting up CDC on the subscriber end of transactional replication?
Also for a bonus answer, why are explicit index operations not permitted (I'm assuming this is even on the publisher?) From BOL:
• Explicitly adding, dropping, or altering indexes is not supported. Indexes created implicitly for constraints (such as a primary key constraint) are supported.
I have created a publication on SQL 2014 SP1/CU1 it is going to a distribution server also a SQL 2014 database. The subscriber is also SQL 2014 SP1/CU1. When I set it up there are no errors. I fire up Replication MGR and it looks good after the snapshot and distribution agent have been started. Again, no errors. When I do a tracer token the information gets to the distributer in 1 - 4 seconds but it never gets to the subscriber, the tracer token monitoring screen only shows pending for distributor to subscriber.
I can upload the scripts used to create the publication and/or the subscription but am a little hesitant because of server names in the scripts.
We had an issue recently where a (transactional) replicated table was replicating data as expected.
Then about 30 or so rows in the source table were not in the destination table, but other rows created after those 30 rows were replicated.
We have pretty much confirmed that users did not delete those rows.
Unfortunately we had to resolve the issue quickly and so blew away & recreated the subscription so a lot of evidence is probably gone from the crime scene.
We cant figure out what could cause 30 rows not to be replicated, yet leave replication operational.
We have push transaction replication from A database to 2 other B and C database. I have configured email to sent upon failure of subscription job of B and D database on Database A. Is this the way that we need to configure email to send when there is replication break up or failure.
Database is MS sql server 2008 R2 Publication Database: A Replication mode : Transaction Replication Replication used : Push Replication from database A Subscription Database: B and C
We have transaction replication configured across multiple SQL instances and could find one of the replication (from publisher to subscriber) net transport sessions is happening via Named pipes rather than TCP. where to troubleshoot this issue and what action to be taken to make it happen via TCP.
I am planning to have AlwaysON Availability Groups setup between Server 1 and Server 2
Server 1 -->Publisher-->2014 SQL Enterprise edition-->Windows Std 2012 --> Always on Primary Replica
Server 2 -->Publisher(when DR happens)-->2014 SQL Enterprise edition-->Windows Std 2012 --> Secondary Primary
Server 4 as Subscriber
Server X as Remote Distributor ..
If i create Publications on Server1 (primary replica) to subscriber 4 servcer, will the publication be created automatically in Secondary Replica Server2 ? or do i have to create manullay using GUI/T Sql on Both Servers?
As per attachment, i have been created replications but in local subscription it is not populated any thing at the same time, Subscription database has been created but tables is not populated as per publication table.
We have 2 nodes window Server 2012 R2 and SQL Server 2012 Enterprise Version cluster setup. We can switch roles and Node to one node to another and revert back to previous node with out any issues. But we are facing when one Node is restarted. We could not restart that Node in cluster Service start in Failover cluster Manager. Error Details is displayed as below inside double code."Cluster node NODE1 could not to join the cluster because it failed to communicate over the network with any other node in the cluster. Verify the network connectivity and configuration of any network firewalls."
I checked windows firewall. windows firewall is all of in Node1, Node2, SAN and DC.I have disabled and enabled the Internal and private network of Node 1. I have validated the cluster. it is showing no error though.
Node1: Public IP: 10.10.0.11 SubNet Mask:255.255.255.0 Default Getway: 10.10.0.1 Prefered DNS: 10.10.0.10 (Ip of DNS)
[code]....
Private Network: Not configured.pinging to each other ip is successful from one node to another.
Is it possible to configure transnational replication between two different domains also non trusted domains.
It's possible means what i need to take care before configure replication and how to configure transnational replication between two different domains.
y'day we faced situation one of the primary server went down and unable to failover the services to second node . by checking in logs we found
Cluster network 'Public' is partitioned. Some attached failover cluster nodes cannot communicate with each other over the network. The failover cluster was not able to determine the location of the failure. Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapter. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges.
I have destroyed the cluster in failover cluster manager and then i am trying to remove node from the sql server installation centre.I am facing the cluster node and cluster service verification errors.I am not able to start the cluster service in services as well.
