Recovery :: Availability Group Loses Connection To Secondary Server
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.
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?
In our(my company) current design we want to switch from failover clustering to Always On as high availibility solution.
I am currently testing the availiblity Group Listener function and have two questions regarding this.
First of all, is it possible to connect to a a listener by just using its "name" instead of "name,port", it is for our users very inconvenient to start using ports. If this is possible, where can I find information on how to configure this?
Second, is it possible to use the Availiblity Group Listener as loadbalancer or in combination with a loadbalancer to split the users over two or more nodes?*note we don't use azure.
need to migrate a cluster with an AG dtabases to new data center cluster with AG.
I was wondering if is possible to do mirroring on top of the AG configuration? or what other options could be to migrate a cluster that has 3 nodes and setup the ag databases to a new datacenter.
Environment: SQL Server 2014 on Windows Server 2012 R2.
We have our availability group configured and working. However, when we try to connect to the AG listener from a remote server, we have to use the fully qualified domain name (FQDN) to connect. We'd like to be able to connect just using the host name. Interestingly, ping actually resolves the IP correctly for either.
i am preparing for always on with multiple instant.is there any consideration with multiple instant ? with each instant shall i create new availability group?
We're having an issue with an AG where the the log backup does not appear to truncate the log. symptoms..Run full backupRun transaction log backup DBCC Loginfo shows all VLFs with a status of 2sys.databases.log_reuse_wait_desc says LOG_BACKUPOPENTRANS indicates no open trans.All backups are being run on the primary.
SQL 2012 EnterprisePrimary server and 2 x secondary serversWindows 2012 R2
I have removed one of the database from availability group by mistake. Luckily I am still operational with primary server. database on secondary servers are on restoring mode.
I have done full backup of database from primary (prod) server and restored on secondary servers with no recovery when I add database into availability group I get an error message log missing what is the best method to achieve and add database again into availability group.
Note I cannot restore database on primary server as it is on production
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.
How do I add my second (secondary) node in my AlwaysOn Availability Group, after adding my head node, and the secondary node is a virtual machine. See based on the attached file if it is the correct way?
I am in the process of rolling out a pair of SQL 2014 servers. I have setup an Availability Group, Listener and databases. It's my understanding that I will be giving the listener name to our developers so that they can do their work. In testing, I noticed that If I am using Studio Manager and connected to the the AG using the listener name, when I setup a user in security the user is only added to the active primary node. Is there a way to add a user to both servers in one shot instead of having to install on both servers?
I need to move files for a lot of databases that are all part of an AG. I've used the method at the bottom of this link with success on a small test DB.
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.
I have a web server that is on our DMZ subnet and I have a sql 2014 database server with Always on Availability Groups that is on our internal domain subnet.The failover cluster is on the internal domain subnet as well. I am trying to connect a web application, that is working off the .net 2.0 framework, to an SQL Server 2014 database using the Always on Availability Group Listener.
The connection strings works perfect with the named instance of the sql server but when I try to use the Availability Group listener it timed out. I did some research online and was led to believe that increasing the connection time would resolve it. I did that and got a different error pertaining to a successful connection but an error occurred during the login process (Provider: TCP Provider, error: 0 - The specified network name is no longer available.)
I just want to connect to an Availability Group Listener on the domain subnet. I have rules in the firewall to allow all services for the IP of the Listener. I switch back to the named instance of the same server and it works flawlessly. I have also connected to the Listener while running the application on the same subnet as the sql server without an issue. I have tried the IP instead of the Listeners name and still received the same error on the DMZ subnet. I'm running on Windows Server 2012 R2 on all servers.
The Web Server is using IIS 8.5..All Physical Machines except the replicas and webserver are virtual machines.All Static IPs involved.As mentioned all SQL Servers are 2014.
I have an active passive cluster on my primary Data center in NY and have a DR Active / passive SQL Cluster in TX. These are two separate clusters in the same domain using the same SQL server credentials.Both clusters host an active / passive SQL instance. Lets call it SQLNY(Primary) and SQLTX (DR). I want to enable always On Availability group within the two SQL Instances SQLNY and SQLTX. The listener will be SQLAG which will be used by the Application to connect to the SQL instance. Is there a practical way to implement this? This will not only give me instant fail over within the NY (Primary) but also give me the flexibility to fail over to TX. I am using SQL 2014 Enterprise Edition on both clusters.
I have a situation where I have two servers in SQL Server 2012 R2 AlwaysOn Availability Group. One is primary and the other one being secondary. I am only running SharePoint Database on it.I have run out of space on the primary server and about to run out of space at the secondary server. I have tried shrinking database transaction log files, but it returns an error that it cannot be shrunk as the database is in the AlwaysOn Availability Group.
Questions: 1. Several forums suggest that databases need to taken out of AlwaysOn Availability Group in order for the shrinking to work properply? 2. Would it have any impact on the database if it is taken out of availability group and then added back?
I'm just starting to work with AlwaysOn Availability and WSFC.
I have in my environment (in Azure) a DC, WSFC and to SQL instances, so I have 3 nodes in my Failover Cluster:
WSFC SQL1 SQL2
If I simulate failure by shutting down one of the SQL boxes my Availability group seamlessly fails over to the other SQL instance - which is great.
However, I'm starting to look into the workings of the Quorum, my envt has the default settings and when I shutdown both of my SQL servers I expected the Cluster itself to go offline as 2 out of the 3 votes will be negative, but the Cluster is still up - Screenshot below when SQL1 and SQL2 are shutdown:
Going through the Wizard (but not changing anything) it shows following config:
I am setting up a new pair of SQL 2014 enterprise servers in HA using Availability Groups. One of the servers is located here in our local datacenter (10.0.1.x) and the other SQL server is in our remote datacenter(172.16.1.x). I was able to setup the Windows Failover Custer without much issue. I setup the AG but when I try to setup the listener. I get the following error. I have setup an IP for both networks on the listener. I have confirmed that there is not any DNS records created for AG listener name. But I still get this error.
I have getting issues when i am creating listener for always On . Error shown as below
Can not bring the Windows server fail over cluster (WSFC) resources online. (Error Code 5942). The WSFC service may not be running or may not be accessible in its currents states, or the WSFC resources may not be in a state that could accept the request.
For information about this error code see "system error code" in windows development documentation
The attempt to create network name and IP address for the listener is failed. The WSFC service may not be running or may not be accessible in its currents states or the value provide for the network name and IP address may be incorrect. Check the state of the WSFC cluster and validate network name and IP address with network administrator. (Microsoft SQL Server error 41066) ...
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.
I have set up a couple of servers in a SQL 2012 AlwaysOn Availability Group (non FCI). I have also configured a Listener which enables SQL clients to connect to the server currently servicing the database, as expected.
I would also like non SQL clients to be able to connect to the server currently hosting the database so that they can run scripts sitting in a share. I don't have a shared disk so just have a directory share on each server with the same scripts in each directory.
I am able to ping and RDP to the listener IP address/name and end up on the correct server but am unable to connect to the share ListenerNameShare. Is that actually supported? If it is, any thoughts on what I need to do to get it going. If it isn't what other options do I have?
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.
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'm working on SQL 2012 Box, which is having Logshipping failed on secondary database, the secondary database was in stand by mode right now but no more restore operation performed on this database since 2 weeks! We checked in the SQL error log and found the error code 14421, severity 16, stat: 1
How to reset the logship back to normally, do I need to disable the jobs before proceed any operation!
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...
I am setting up a 3 node cluster as part of an availability group.Initially I tested failover between nodes using SQL Management Studio and everything failed over successfully when I stopped a node, and I was still able to write queries. I started to test with an application which connects using an SQL user and whenever I would switch nodes, I would get login failed. I believe the cause of this issue is because the server logins SID's which are tied to the database are different than the server logins on the other nodes which resulted in login failed.how can I ensure that the server logins SID's are the same between nodes? Is there a way of copying this over or how is this supposed to be done? I read a little about contained databases where I could just set the login on the database itself vs. creating a server login but I would rather not go down that route.
PROD1(cluster 1) Clustered SQL instance1 PROD2(cluster 1) DR 1 (cluster 2) Clustered SQL insatace 2 DR 2 (cluster 2)
I have set an availability group up from the PROD instance to the DR instance.How does the AG behave if a SQL instance fails at PROD? Does it try to fail over to Node 2 on Prod before going over to DR? or bring the Replica at DR online straight away? Can we only use Manual Failover of the AG in this scenario to make use of the High Availability of the Windows cluster?
automatically replicates new databases to Availability Group partners - if you do a little prep work on your environment first.To make it work:
1) Create linked servers on all group members pointing to all other servers in the group, with names matching the hostnames they represent. 2) Ensure suitable credentials (or 'current context' impersonation) for linked servers. Also: Enable RPC and RPC OUT 3) Run the DDL code below. 4) Schedule hadr_replicate_queue on [master] to run as often as you want initial syncs to occur. Every 5-10 minutes is plenty for most purposes. 5) Connect to an availability group listener and call CREATE DATABASE :)
I use a slightly more extended version of this code at home to do things like permissions synchronization across replicas - I essentially allow applications to install direct to an availability group replica and then have all the relevant objects replicate to other nodes. I don't really like going through manually and doing things, even though there's an AddIn from SQLSkills for management studio - it still requires manual intervention.
The main use I have for this at home is that I'm using the Azure pack, and want to automatically ensure that my newly created 'SQL Server Cloud' databases are highly available, plus it means when I install a non-alwayson aware product it doesn't require any extra work afterwards to allow failover to another machine.
* AlwaysOn Self-Population Script * By: Steve Gray / steve@mostlyharmful.net * Usage: Free, but buy me a beer if you're ever in Brisbane. **/ USE [master] GO IF EXISTS (SELECT * FROM sys.tables WHERE name='hadr_pending_replicate')
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.
