SQL Server Admin 2014 :: Availability Group Handshaking Fails After Network Outage
Aug 14, 2015
I'm running a primary and secondary on sql server 2012 enterprise edition on windows server 2012, and it runs fine except when a network outage occurs.
Then the handshaking keeps failing, the databases on the replica show as not synchronizing and the only way to fix this is to reboot both primary and secondary.
We keep getting 3520's, etc. on the DR error log
How to eliminate all these prod reboots?
I increased query connection timeouts to 60, but saw no change.
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Aug 18, 2015
I've been working with sql server for some time, but couldn't find any way to fix this problem without rebooting the production and secondary sql servers, which is not very good for uptime .
I'm running a primary and secondary availability group on sql 2012 enterprise edition on windows server 2012, and it runs fine except when a network outage occurs.
Then the handshaking keeps failing, and the secondary databases all show not synchronizing.
The primary DBs all show synchronized.
I tried following several different troubleshooting guides for always on, but nothing I tried fixed the issue.
The only way to get them in sync is to reboot both primary and secondary. Just rebooting the secondary didn't fix it.
The secondary server error log showed AlwaysOn Availability Groups connection with primary DB established, then DB mirroring login succeeded, then error 35250, the connection to the primary replica is not active, then connection timeout.
I increased query connection timeouts to 60, but that didn't work.
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Jul 3, 2015
We have 4 servers : Server 1 , Server 2 and HA , DR servers.
I designed 2 Plans to get HA support for my databases .
Which of them are better , And is there any problem in my design ?
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Nov 10, 2014
Is there any way to trigger an event (ie. call a procedure/job/etc.) when/if an AG fails over?
Not looking to use agent alerts.
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Dec 24, 2014
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.
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Jun 17, 2015
What I asked for: Three Windows Server 2012 R2 machines with independent storage running a SQL Server 2014 AlwaysOn Availability Group. DB1 would be the primary, DB2 would be a synchronous replica, and DB3 would be a remote asynchronous replica.
What I was given: a two-node Windows Server 2012 R2 WSFC to run SQL Server 2014 Enterprise with shared storage and a third (remote) Windows Server 2012 R2 machine with independent storage, also with SQL Server 2014 Enterprise, to host an AlwaysOn Availability Groups asynchronous replica.
DB1 and DB2 (as Cluster1) share an E: drive. The remote DB3 has its own E: drive. Initially, DB3’s E: drive was claimed as a cluster resource and I couldn’t even see it. I’ve had several ugly days trying to make this work and have temporarily given up, installing DB3 as a standalone SQL Server that is no longer part of the WSFC and pointing everything towards that (it was originally a third node in the WSFC).
Is it possible to create an AlwaysOn Availability Group with nested clusters (i.e. create the AOAG with Cluster1 and DB3 and somehow ignore the individual nodes that comprise Cluster1)?
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Nov 14, 2014
Where can I find dates and times to when an availability group was moved outside of the SQL error log?
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Jan 27, 2015
I Create an availibility Group with a primary and a secondary. (For test)
Then run Planed Failover.
Switched to secondary. That's ok.
After that I update some tables on secondary (That now is primary)
I Run Again Planed Failover on server 2.
Switched. OK
But primary database Get (Not synchronizing) Status.
And in primary I don't have that updates.
How to sync these databases and exit from Not synchronizing.
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Jun 27, 2015
I setup an availability Group. (Only 2 servers - Primary And secondary) -- 21 , 22
I also define an listener . IP .. 23
1- In First step I connected To Listener (23) And in a while I inserted A record to a table .
While 1=1
insert into Tbl_T1(f1,f2) Values (1,2)
2- in second, I Stop the primary .
- I expected this while whitout disconnect, continue.
3- The while code stopped whit this message :
Msg 64, Level 20, State 0, Line 0 A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)
4- I execute again the script, And it worked in new primary.
My questions :
1- is the listener disconnected between switched primary and secondary ? OR have we data loss between switching?
2- I did some huge update on Primary that fill the Log fiel space. And in last Update I got this error :
Msg 9002, Level 17, State 2, Line 27
The transaction log for database 'Your_DB' is full due to 'LOG_BACKUP'.
Is this (Fill All space) a reason to switch primary? Or not ?
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Apr 2, 2015
The MSDN doc makes it sound like after a failover of the primary, the CDC data won't "keep working" on the secondary unless you "To allow the logreader to proceed further and still have disaster recovery capacity, remove the original primary replica from the availability group using ALTER AVAILABITY GROUP <group_name> REMOVE REPLICA. Then add a new secondary replica to the availability group."
We have a few CDC tracked tables that we use and the general idea of AlwaysOn I thought was to minimize all the overhead and let things "just work" so your apps just connect and the listener re-routes everything where it needs to go.
It looks like to get this working properly an automated job /trigger would have to wait for a failover event and then kick off tasks to remove and re-add the replica and perhaps start up the CDC job on the secondary?
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Aug 18, 2015
I am trying to create a job that runs against my High Availability listener server.
It is a fairly simple SQL statement in the job - execute tsql.
When I try and run the job I get the error:
Executed as user: NT SERVICESQLAgent$SQL2014A. The target database ('BB_Prod') is in an availability group and is currently accessible for connections when the application intent is set to read only. For more information about application intent, see SQL Server Books Online. [SQLSTATE 42000] (Error 978). The step failed.
I thought there was a way to run a select statement as a job against the listener? The tsql step is only a select.
Is there a way to pass in the application intent = readonly as part of my SQL statement?
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May 21, 2014
how does security works between availability groups.
ex if i create an object and grant permissions to a user will that be replicated to secondary replica .
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Aug 28, 2014
We are having a conversation at work and the subject of load balancing with SQL came up. Right now we are running SQL Server 2014 on four (4) machines. I am using a AlwaysOn with Availability Groups (AG). Now I know that we can scale out the reading in AG by allowing the secondary serves to receive reads.
Is there a way to be able to do this with writes? Can I have in essences 2 masters that some how reconcile with each other? We are expecting a huge amount of writes in the near future and we need a way for SQL to handle the amount of traffic we are expecting with out any issues.
I explored the possibility of Peer - to - Peer replication; however, it seems that it would be more work if we are constantly making updates to the database scheme.
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Feb 11, 2015
we currently use Backup Scripts from Ola Hallengren, It Says Full (non copy-only) and differential backups are performed on the primary replica. Full(Copy-only) backups and transaction log backups are performed on the preferred replica.
we currently do FULL(COPY_ONLY) Backup everyday and LOG Backups for every 15 min, is there any performance benefit on running the FULL (non copy-only) on the preferred replica .
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Jul 9, 2015
I have a situation where I need to rebuild indexes on a large DB (500G).
When I do a test run of the rebuilds in my test environment it uses 100G of space - which is fine with me.
When I do a rebuild in my High Availability environment - same DB, same script - it eats up over 600G of space and fills the volume.
What can I do without removing my DB from H/A to rebuild the indexes?
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Sep 1, 2015
We have a server A and a server B setup with SQL2014 High Availability - working fine.
I need to add an additional listener to our new DR site.
What is the best way to do this without impacting production - can I just add the additional replica from nodea as a secondary replica?
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Sep 15, 2015
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?
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Oct 16, 2014
This is my first deployment of an always on availability group for SQL 2014 and I'm trying to get my custom backup procedure to handle all databases appropriately depending on the primary group. Basiscally I want the system databases and all databases that don't participate in the availability group to be backed up on both nodes and those that do participate backed up ONLY on the primary server. I've looked at the sys.fn_hadr_backup_is_preferred_replica funcation, but would like to only have to test for a single databases existance in the availability group. If the one database is in the group, only backup the system databases and those that don't participate, otherwise backup everydatabase. This would be the case for both full backups and transaction logs.
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Nov 3, 2015
We are looking at going down the High Availability Always On route. However we have some concerns around the lack of support for MSDTC. In short we are concerned that developers may introduce functionality either on purpose or by mistake that uses the or escalates the Query’s to the MSTDTC. As this could result in database splitting.
Understand that this will be a moot point in SQL 2016 but for 20122014 is it possible to disable the MSDTC to protect against this and run High Availability Always On. ? Does it just need to be disabled on the SQL Server or does it need to be done on the application server ?
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Nov 25, 2014
I want two write a small script to determine which is the currently active (primary) server in the AG.
Right now, I see that using SELECT * FROM SYS.dm_hadr_availability_replica_states I can determine the role. However, when the server goes down and switches to the secondary node, I don't believe that the role changes (or does it?). How do I determine which is the active node?
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Jan 5, 2015
I have SQL Server 2014 (Enterprise) on Server A. The service runs under DomainAAdmin.
The Client machine is B, User credentials DomainBUser.
DomainBUser has a share on B that contains a BCP data file. DomainAAdmin has full access to this file.
If I log onto A (the server machine) with either DomainAAdmin or DomainBUser credentials, and run SQL Server Management Studio with Windows Authentication I can run BCP sucessfully using the following:
BULK INSERT [MyTable] from 'Bsharedatafle.tsv' WITH ( KEEPNULLS , KEEPIDENTITY ) However, if I log onto B, (the client machine and the machine hosting the share) and try to run the same bcp command, I get "Access is Denied".
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Sep 23, 2014
While doing the restore of the database is it better to copy the backup file locally and restore or restore from the network path is good option?
What kind of the problems we may get restoring the backup from the network path?
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Aug 11, 2015
I have a job that runs an SSIS package. The job seems to be able to run through the package successfully, but at the end it errors out saying "The binary code for the script is not found. ...". The script referred to is at the beginning part (not the very first step) and should already be run.
The thing is, I can manually run this package on the server or visual studio without any problem. Also this job has been run on a regular basis without any issues on our old SQL 2008. I'm migrating this to Amazon Cloud SQL 2014.
Together with this package are other two very similar ones. They all work fine. I just can't figure out what can be wrong with this one.
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Aug 7, 2015
i m not able to start the SSIS service on my laptop . IT gives error saying SQL server integretion service 11.0 service on local computer started and then stopped . some services stop automatically if they are not in use by other services or program
i am not able to start SSDT . it gives error
microsoft visual studio is unabble to load this document to desigen integration service package in ssdt , ssdt has to be installed by one of these edition of sql server ; std enterprise,dev,or evloution
i hav installed sql 2012 evolution verison on my local desktop.
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Jun 23, 2015
I'm trying to do an unattended upgrade of 2014 RTM to 2014 SP1.
It's my first attempt at an upgrade configuration file, and its failing with missing registry entry for database engine service and replication service.
Error in summary.txt is:
The registry key SOFTWAREMicrosoftMicrosoft SQL ServerMSSQL12.MSSQLSERVER2495Setup is missing
That's a valid error, as the registry only has an entry for:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftMicrosoft SQL ServerMSSQL12.MSSQLSERVERSetup
Am I missing something obvious here, or how can this be resolved?
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Apr 23, 2015
We recently had a problem with DB Mail. SQL jobs that sends an email succeeded but the email in the job fail to sent. There was a problem with the email server. The error is included. We fixed the problem with the email server. How can I get an alert when a DB Mail email fails send?
Date4/23/2015 10:01:06 AM
LogDatabase Mail (Database Mail Log)
Log ID5907
Process ID13204
Mail Item ID5702
Last Modified4/23/2015 10:01:06 AM
Last Modified Bysa
Message
The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 1 (2015-04-23T10:01:06). Exception Message: Cannot send mails to mail server. (Insufficient system storage. The server response was: 4.3.1 Unable to accept message because the server is out of disk space.).
)
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Sep 15, 2014
I have a user, who is trying log into the server, but everytime he gets this error saying something about the Group policy denies him access.
This user needs access and i'm trying to understand how to grant it to him.
I have been looking into how i can access the group policy editor, but the farthest i can get is the Local group policy editor. How do i make sure this specific user has access?
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Jul 16, 2015
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.
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May 7, 2014
A little background on what I am trying to achieve first. We are moving to Azure virtual machines and we will have 8 disks on the SQL Server box. I am adding more files to the primary file group and each file will go on its own drive. I am then rebalancing data across these files by rebuilding all of the indexes on the tables which is working fine. No problems so far all is good.
I now have an additional problem. If there is a lob or blob column on the table, rebuilding the clustered index and all the non clustered indexes doesn't rebalance the blob or lob data across the disks such as it does with in row data.
I cannot find any articles on rebalancing lob or blob data because all the articles say to move to a new file group. I do not want a new file group, I just want to use the primary file group where the data already resides, and just redistribute it evenly in the same way that I can in row data which is working fine.
One solution I thought about was to BCP data out of the table, truncate the table and then BCP back into the table which I imagine would have the desired effect of distributing the data evenly over the files.
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Oct 25, 2007
We have mirroring set up on SQL 2005(SP2) on windows server 2003 servers for 6 production servers to DR servers. It is high performance mode(asynchonous). We are using fully qualified server names with default 5022 port. Prod and DR are using same domain service account.
We had network outage for about 30 minutes last weekend and after that network was restored back to normal. Also few SQL 2000 servers have logshipping and it automatically started syncing up after network was restored. However mirroring didn't start automatically. Partners were in disconnected state and endpoints were stopped. For one database, log grew to 40 GB using most of the disk space.
Then we maually had to run
ALTER ENDPOINT Mirroring STATE = STARTED
and then it started syncing up.
Now the question is why it doesn't start syncing up automatically after network is back to normal and recognize the partner?
Is there anyway we can setup timeout or any parameter like that to specify how many times or how long partners try to connect with no luck and then give up?
Mintu
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Nov 20, 2015
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.
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Jul 6, 2015
For a database, we have 4 data files in a particular file group and the file sizes are almost 70 GB each.
Do I come across any performance issues if I create/pre-allocate an additional data file in the same file group so that the existing files don't grow too much?
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Apr 27, 2015
In a server we had File Growth,And then We had to Add New Hard Drive And New File On It.And Now We have New server with a Huge Hard Drive.But all files remaind.Can I Reduce This files to One data file or not ?
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