SQL 2012 :: What Are Differences Between AlwaysOn And Clustering
Apr 24, 2015What are differences between always on and SQL Server Clustering
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SQL 2012 :: Advantages Over SERVER AlwaysOn Over Clustering
May 14, 2015Give the Advantages Over SQL SERVER Always on over Clustering....
View 4 Replies View RelatedSQL 2012 :: Clustering AlwaysOn - Primary And Secondary Replica
Apr 11, 2014Looking for info on ole/requirement of primary and secondary replica under SQL Server 2012 AlwaysOn.
View 4 Replies View RelatedDifferences Between Linked Servers And Clustering?
Aug 29, 2007hi can anybody please explain what the differences are for linked servers and clustering? cause from what ive read they seem like they do the same thing to me. other than the failover implementation for clustering and its high cost. is there any other difference? same question goes for logshipping and database mirroring. logshipping ships transaction logs to other servers and then restores them there right? how is that different from what mirroring does? thanks for the help
View 2 Replies View RelatedRecovery :: Differences Between Clustering In Oracle
Oct 5, 2015I am need of comparing ORACLE and SQL clustering,.
1) Dynamic addition / removal of nodes with no effects on data distribution-- I think Yes
2) Integrated clustering technology for all major OS and Server Platforms
3) Automatic Workload management that enables enterprise Grids
4) Recovery Advisories
SQL Server 2012 :: Differences In Rounding / Converting Strings?
Dec 9, 2013difference between
SELECT ROUND ('6.465',2) --- result 6.46
and
SELECT ROUND (6.465,2) --- result 6.47
with
It's because you're relying on an implicit conversion from a string to a decimal data type which SQL server will do to 2 decimal places by default...
Alright:
SELECT ROUND (CONVERT(DECIMAL(3,2),'6.465'),2) --- result 6.47 Now please explain this:
SELECT ROUND('0.285',2) -- 0.28
SELECT ROUND(0.285,2) -- 0.29
SELECT ROUND (CONVERT(DECIMAL(3,2),'0.285'),2) --- result 0.29 The string value does not seem to be converted to decimal with 2 decimal places.
MS is on the safe side with mentioning the last digit is always an estimate But because the result of the estimate is always the same, I would like to know:
* how is a string value exactly implicitly converted?
* how exactly does the estimation work, that in case of doubt rounds a value up or off?
SQL 2012 :: AlwaysOn Pending Changes
Aug 18, 2014How to find the pending transactions to be applied on secondary in Always On? Can i get those details from dashboard?
View 2 Replies View RelatedSQL 2012 :: AlwaysOn A/G Across Two Clusters
Oct 22, 2014We are looking to setup an AlwaysOn A/G between two SQL instances across two SQL clusters - one cluster has two nodes the other has three nodes.
Is this possible using WSFC? Does the A/G wizard just handle this?
SQL Server 2012 :: Results To Show Differences In Items Purchased Versus Sold?
Jun 3, 2014I am looking for a way to show how I can have a result set that shows a record with one item and the number of records where it was purchased or sold. Below is my sample data.
Use tempdb
go
create table #ItemLedgerEntry
(
ENTRYNO INT NOT NULL
, ITEMNO VARCHAR (50) NOT NULL
, POSTINGDATE DATETIME NOT NULL
, ENTRYTYPE INT NOT NULL
[code]....
I know something like this will give me results but I'd like to run one query.
select itemno, count(*) from #ItemLedgerEntry where entrytype = 0
group by itemno
order by count(*) desc
SQL 2012 :: Backup Setup With AlwaysOn?
May 13, 2013I'm setting up my first pair of Sql 2012 servers using AlwaysOn. I set up backups to run on the primary and I understand that you can set up backups to run on both the primary and secondary servers but the secondary will fail. Is there a way I can stop the secondary server from sending out error messages about failed backups? Is it possible to script it so that the server looks at whether it's primary or secondary and turns on or off alerts based on that?
View 8 Replies View RelatedSQL 2012 :: AlwaysOn With Clustered Disks
Mar 13, 2014I am trying to build the 2 node 2 clusters with the AlwaysOn.
Here isthe landscape.
2 nodes PROD failover cluster (running once instance)
2 nodes DR failover cluster (running 2 instances - DR and PRE-PROD)
Both clusters are in different geographies.
PRE-PROD can be editable. So out of scope of Always On.
One instance on PROD -> DR of the other box. [Want to achive thru AlwaysON]
Now my Question:
1) Do i need to have all the 4 nodes in same failover cluster group? If yes, then this would become MultiSubnet cluster Or Is there any way those 2 diffrerent failover clusters (one DR and one PROD) can be part of AlwaysOn.
2) Can i use the clustered disks as in the above landscape for always on?
SQL 2012 :: Creating 2 AlwaysOn Clusters For 1 App
Apr 11, 2014We have 2 SQL 2012 servers. Our application has 2 databases. We are creating an AlwaysOn cluster. Is it good to create 2 AlwaysOn clusters to have 1 database primary on one of the servers and the other database primary on the other server?
I have been asked if it is possible to have one database running on one server and the other database on the other server. Is this possible without creating 2 separate AlwaysOn clusters?
SQL 2012 :: AlwaysOn Two Secondary Replicas
Apr 14, 2014While configuring SQL Server 2012 Cluster with Always on, why do we need two secondary replicas.
The attached link will describe the actual query. [URL] ....
SQL 2012 :: AlwaysON Setting Up A C Node?
Apr 28, 2014I have an A & B node set up and running. I now want to add a C NODE.
The catch is the C NODE is in a SQL Cluster Environment.
I am guessing I add the Virtual Name of the C node to the current Always ON Cluster?
I tried adding it...the error message says" the Virtual Node is really the A node and to add the A NODE"?
SQL 2012 :: AlwayOn With No Clustering Windows?
Aug 28, 2014I want to install sql 2012 in a non-cluster windows servers, then set up Always-on between these 2 servers. Every article mentions Windows Clustering, and we dont have clustering for now.
Can I set up Always On, in a NON_CLUSTER environment?
Also where I can find instructions step-by-step installations of SQL Server 2012 and most importantly ALWAYS-ON.
SQL 2012 :: Setting Log Shipping In AlwaysOn Environment
Jan 23, 2013We have 4 Servers which have SQL SERVER 2012 and "AlwaysOn" have been enabled on all 4 servers:
Server1,Server2,Server3,Server4
Server1 is the Primary node and thr rest are secondaries. There is a Sync relation between Server1 and Server2 and also there is aSync relation between Server1 and Server3 & Server4.
Is it possible to setup log shipping from Server2 & Server3(secondaries) to two new servers?
SQL 2012 :: AlwaysON Availability Groups And Listeners
Feb 13, 2014I have four instances and each instance have its own Availability Group with its own listener.
Would like to know if you can have one listener for multiple Availability groups?
SQL 2012 :: Maximum Cluster Nodes In AlwaysOn
Mar 17, 2014How many nodes can you have in a cluster with SQL 2012 alwaysOn.
I understand that availability groups are limited to 5 nodes but if you had a 10 node cluster and decided to create multiple availability groups using various nodes within the 10 nodes but never exceeding 5, is that possible?
Or is there a counter or some validation from SQL AlwaysOn that actually hard limits to a grand total of 5 nodes in a cluster?
SQL 2012 :: Renaming AlwaysOn Availability Groups?
Apr 28, 2014We had 3 Availability Groups set up in SQL 2012 last year but they were poorly named so I am just looking to rename them but there doesn't seem to be any command for it that I can find.Can they not be renamed once created? I guess I could just create new ones and move the DB's into them but just thought I would check!
View 1 Replies View RelatedSQL 2012 :: AlwaysOn Read Only On 2nd Instance Server
Jul 18, 2014Considering trying to move 2008 acitve/passive cluster with log ship to day old read only 2008 server to 2012 active/passive to 2012 AG Read only server. Only problem is that read only instance may have to be a 2nd instance on a server. The new box is a beast 64 core 256 gig of RAM hp so this is no dog. So I have these choices
migrate 2008 active/passive cluster to 2012 active passive (this will be it's own ordeal)take new monster box and build two instances, one that will run the AG read only database, the other will house reporitng services and analysis services and a few dw databases. We are not heavy into deep dive analysis services yet kind of in it's infancy. Not sure if this other instance will be sql 2008R2 , may be able to do 2012. MY also have a few small sharepoint databases but they barely use it.
SQL 2012 :: AlwaysOn - Readable Secondary Option
Aug 21, 2014In 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.
View 0 Replies View RelatedSQL 2012 :: AlwaysOn - Readable Secondary Options
Aug 21, 2014In 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?
SQL 2012 :: AlwaysOn AG Replicating Much Slower Than Mirroring
Sep 30, 2014I'm setting up AG replication over our WAN (1GB MPLS). Using sql stress, AG replication quickly falls behind. Network throughput plateaus at ~14Mbs.
The problem ISN'T NETWORK
using conventional mirroring, the same workload never falls behind, throughput plateaus at ~26Mbs.
it's almost like log stream compression isn't happening for AG...
both mirroring and AG are using async.
SQL 2012 :: Make AlwaysOn Over Normal Cluster
Nov 13, 2014Can we make SQL 2012 Always ON over the normal SQL Cluster 2012.
View 3 Replies View RelatedSQL 2012 :: AlwaysOn Failover Due To Missed Heartbeats
Dec 10, 2014I have setup SQL AlwaysOn between primary and DR data centers. Here is the setup:
Primary data center: Server1 (Primary), Server2 (Sync Commit Secondary), Server3 (ASync Commit Secondary)
DR data center: Server4 (ASync Commit Secondary)
Data synchronization and manual failover works fine. But, sometimes, the AlwaysOn cluster automatically fails over to Sync Commit Secondary on Primary data center. Here is the error message from Failover Cluster Manager->Cluster Events:
"Cluster has missed two consecutive heartbeats for the local endpoint xx.xx.xx.yy:~3343~ connected to remote endpoint xx.xx.xx.zz:~3343~"
"Cluster has lost the UDP connection from local endpoint xx.xx.xx.yy:~3343~ connected to remote endpoint xx.xx.xx.zz:~3343~"
I had our network engineer check all connections multiple times and he confirmed everything is fine. But he was also able to confirm (using monitoring tools) that right at the time of a failover, there is almost 2GB worth of traffic going from Primary Server to DR server. That happens every time. I had checked the times of all failovers and there is no job or process occuring that will produce 2GB worth of data. Also, this happens regardless of which server is primary.
Even though the failover works fine, this unexpected automatic failover due to missed heartbeats are occurring often (2-3 times a month).
Here is the list of errors from the Cluster Validation Report:
Under Network Section, I see the following error messages in Red:
Validate Network Communication
Network interfaces Server4 (DR) - SAN_Team and Server1 (Primary) - SAN_Team - VLAN 20 are on the same cluster network, yet address xx.xx.xx.pp is not reachable from xx.xx.xx.yy using UDP on port 3343.
Network interfaces Server4 (DR) - SAN_Team and Server2 (Secondary) - SAN_Team - VLAN 20 are on the same cluster network, yet address xx.xx.xx.qq is not reachable from xx.xx.xx.yy using UDP on port 3343.
[Code] ....
SQL 2012 :: AlwaysON Linked Servers Failover
Jan 27, 2015So I have 2 servers S1 & S2.
Database Group 1 = L1 with Primary S1 and Secondary S2
Database Group 2 = L2 with Primary S2 and Secondary S1
For 99% of the time the 2 groups of databases are not related. For the 1 procedure that does move data from L1 to L2 something like
Update L2.DB.Owner.Table
set flag = 1
Whare a = 0
On S1 I have a linkedServer with connection to L2.
If I have a failover I cannot have L2 on S2 as they are essentially the same server.
How to I use the 2 groups hand in hand.
SQL 2012 :: Log Management Of Primary Database In AlwaysOn?
Mar 1, 2015In always on docs in msdn they mention only about backup of secondary.. explain the backup of primary or how logs are managed in primary database. My doubt is a normal database in full recovery mode the log file will grow if we didnt take proper log backup,how the same is managed in primary in Always On.
View 2 Replies View RelatedSQL 2012 :: AlwaysOn Database Not Synchronizing / Suspect
Mar 2, 2015We have a database in an AlwaysOn Availability Group that has gone into a state of Not Synchronizing / Suspect on the secondary.
The reason why this happened is because the secondary ran out of disk space so the log file wasn't able to be written to. The database was set to synchronous mode.
Is the only way to recover from this to do a re-initialization or is there another way to recover?
SQL 2012 :: Setup AlwaysOn On Existing Cluster?
May 19, 2015We have an existing SQL Server 2012 Enterprise cluster with 2 nodes (active-active) and uses Windows 2008 R2 OS. We are looking for a way to increase HA as well as offload backups to secondary server and it was suggested that AlwayOn could be an option.
The questions I have are:
1) Is it possible to turn on AalwaysOn feature on an existing cluster?
2) If yes to above, does the secondary replica need to exist as a node on the same cluster or can it be on a completely different cluster?
3) If the secondary replica is on the same cluster (i.e. we add a 3rd node to existing 2 node cluster), can that node be provisioned with storage from a completely different SAN? (i.e. Node 1 and Node 2 accesses LUNs on SAN1 and Node 3 accesses LUNs on SAN2).
SQL 2012 :: Error At Adding Listener For AlwaysOn
Jun 11, 2015I am trying to setup an AG on a cluster, I was able to define where I want my replica, but I need to setup the ip for the listener of that one
When I am adding the Ip at the listener I am getting the following message:
The Windows Server Failover Clustering (WSFC) resource control API returned error code 5057. The WSFC service may not be running or may not be accessible in its current state, or the specified arguments are invalid. For information about this error code, see "System Error Codes" in the Windows Development documentation.
The attempt to create the network name and IP address for the listener failed. The WSFC service may not be running or may be inaccessible in its current state, or the values provided for the network name and IP address may be incorrect. Check the state of the WSFC cluster and validate the network name and IP address with the network administrator. (Microsoft SQL Server, Error: 41009)
Browsing around I found this guide: [URL] ......
And I make sure that the cluster has permissions to "Read all properties", "Create Computer Objects", even to "Create all child" permissions
I also added those permissions to the account that starts sql at that cluster and I am logged as that and I am still getting the error....
SQL 2012 :: AlwaysOn Availability Group Per Database
Jun 26, 2015We are planning to upgrade our production servers from mirroring to alwayson. Our current mirror setup gives the advantage that it can failover a single database.To have a similar setup in alwayson we are probably going to create an availability group per database. Any other disadvantage in this except for the extra initial configuration work?
View 9 Replies View RelatedSQL 2012 :: AlwaysOn Multiple AGs And Listeners In Same Instance
Jul 9, 2015Currently we have an AlwaysOn AG set up with a listener running on port 1433 (underlying instances are on a non default port). Great, no problems there.If we set up a second AG on the same instance with its own specific listener, can this new listener also be configured to use port 1433?
View 2 Replies View RelatedSQL 2012 :: Configure AlwaysOn Between Two Different Network Section?
Jul 29, 2015How to configure AlwaysOn between two different network section?
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