SQL 2012 :: Same Database On Multiple Cluster Nodes For Performance?
Aug 6, 2014
Is it possible to create a cluster configuration, where 2 (or more) SQL Server instances running on different servers will simultaneously serve the same database attached to the same storage? Something like this:
Instance A Instance B Instance C
(active) (active) (active)
| /
| /
| /
SAN for Database and Quorum
The point would be to improve reliability and performance at the same time. All nodes would share load. If a node fails, the other nodes still work and take over the load.
I know a failover cluster can be done, where 1 instance is active and others are passive (active/passive) which improves reliability, but in this configuration just 1 instance is serving at the same time.
(As far as I understand, the active/active configuration is meant to run different databases on 2 (or more) instances such that the databases on a failing node are taken over by any other instances in the cluster.)
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Mar 17, 2014
How 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?
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Apr 17, 2014
I had a cluster running on 3 nodes (windows failover cluster) with server 2012 and SQL server 2012 running in the cluster. Well, I thought I'd just go ahead and rename all 3 of the hosts with new hostnames and it apparently broke the cluster pretty bad. Now when I open failover cluster manager I cannot see anything nor can I connect to the cluster object in AD. I re-named all of the hosts back to their original names but that didn't work.
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Oct 5, 2007
Hi There
I have found no real documentation on this, so any links would be greatly appreciated.
We have an existing 2 node active active cluster.
A default and and named instance SS2005 Enterprise Edition are installed on the cluster.
Recently we acquired new hardware, 2 servers, which we added to the cluster so we now have a 4 node cluster.
The 2 new nodes have OS etc installed.
Now i have installed sql on a new multi node cluster, i have upgraded sql server in an existing cluster BUT i have never installed sql on an existing cluster for new nodes for multiple instances.
Now i presume you simply run the install on one of the new nodes, do this for a default instance, selecting both 2 new nodes to installl on. And do this again for the named instance.
But in the past I have never been promoted for which nodes to install sql on, it simply does all the nodes BUT i do not want this.
And how will the cluster know where the binary files are for each instance on the new nodes?
In a nutshell, how do i install sql server 2005 for 2 new nodes in an existing 4 node cluster for multiple instances ?
Thanx
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May 23, 2014
How do I SELECT multiple nodes with same name but different attributes. For example, I would need to SELECT NM1.03.1 from <NM1> node. How do I specify which one I want to SELECT? What if I want to SELECT them all? What if I only want two of them?
<NM1.03.1>SAMPLE INC</NM1.03.1>
<NM1.03.1>PPO BLUE</NM1.03.1>
<NM1.03.1>EDI SPECIALTY SAMPLE</NM1.03.1>
<NM1.03.1>CUSTOMER</NM1.03.1>
--Sample Code
<X12Transaction elementDelimiter="*" segmentDelimiter="
" subelementDelimiter=">">
<ISA>
<ISA.01>
<ISA.01.1>00</ISA.01.1>
[Code] ....
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Dec 9, 2014
My xml is in below format:
DECLARE @MyXML XML
SET @MyXML = '<RS>
<R id="6330">
<WF id="71445">
<WFS id="12790"> <fname>John12790</fname> </WFS>
[Code] ....
I need to insert into table with TSQL query:
My output should be similar below:
John12790 12790 71445 6330
Eric 12791 12790 71445 6330
John12793 12793 71446 6331
Eric12794 12794 71446 6331
otherwise i need to write huge c# code to execute such thing..
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Jul 15, 2015
We are planning to change all IPs of PRODUCTION Failover Cluster Setup. In my cluster setup ... we have 2 Physical Nodes with windows-2008, Roles are MSDTC and SQL-2008R2.
IP change for:
1. Both Nodes(Physical)
2. MSDTC
3. SQL ServerÂ
4. windows ClusterÂ
So Almost... All IPs are going to change.
Im DBA here, I need to take care of SQL cluster and MSDTC. But I haven't performed this activity before.So I'm worrying about Impacts and consequences of this change. steps how should I perform this activity.
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Oct 12, 2007
HI There
We had an existing 2 node active / active cluster, 1 running a default instance of Sql Server 2005 Enterprise Edition 9.0.3152 (SP2 + Hotfixes) and the other running a named instance of the same version.
We recently added 2 new nodes to the cluster, they were successfully added and we tested the cluster group failover successfuly to the new nodes.
Last night we tried to install Sql Server 2005 Enterprise edition on the new nodes.
I followed to proper proceudure of modifying the installation for both instances and selecting the 2 new nodes to apply them to. This went 100%. Sql Server 2005 successfully installed for both instances on the 2 new nodes, all log files were successful.
We then tried to apply SP2, we tried the following:
1. We ran SP2 from the active node, but when we go to the screen to select what you want to apply SP2 too we could not select anything, if you clicked on database engine the message said that these instances were already at a later version and we could not proceed. This is how i successfully applied SP2 to the original 2 node cluster but it does not work for additional nodes to an exisitng cluster.
This is also what all the documentation we could find said, refer to SP2 release notes under the topic "Failover Cluster Installation", it is also the method we found when googling.
2. We then tried what is described under SP2 release notes "Rebuild a SQL Server 2005 SP2 Failover Cluster Node".
We ran SP2 from the new nodes while they were passive, but when we got the screen where you select what to apply the SP2 too we could not select database engine the message at the bottom said that SP2 must be run from the active node and that we were attempting it from the passive node, this is what we tried in step 1 described above.
3. This was a last resort. We were advised to try failing over the instance to the new node and then running SP2. Personally i thought this was a bad idea, one should never fail over a instance of sql server to a node with incompatible binary versions and secondly when we installed sql server on the new nodes a warnng popped up before hand stating that the instances were at a later version and that the new nodes must be at this version before attempting fail over. I thought that sql would not even start, to my surprie we successfully failed over the sql group to the new node, when we ran SP2 it looked good we could select the database engine on the new node to apply SP2 too, BUT after clicking next after a few seconds the SP2 installation just closed, NO INFORMAITONAL MESSAGES NO ERRORS NO WARNINGS it just closed an never came back.
I had never seen this happen on a cluster before, needless to say this made me very nervous so we failed the sql group back to the original nodes and gave up.
PLEASE can some tell me how to apply SP2 to 2 new nodes in a 4 node cluster all methods descibed in SP2 release notes and other documentation as descibed above in step 1 and 2 do not work !
Thank You
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Jul 15, 2015
I'm setting up a cluster to test a new deployments of SQL2K14 on a WSFC cluster (W2K12R2). Starwinds VS. the built in iSCSI service?Will either one allow me to build a cluster consisting of two nodes? Do I need to dedicate a third node to run the iSCSI storage?
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Feb 13, 2006
I can't seem to install SQL Server 2005 (x64 version) on an x64 Win2k3 two node cluster.
I get all the way through the configuration and setup fails because it cannot start a task on the remote node. The error message indicates to check the task scheduler log file, which I have and I cannot find any 'errors' in the file.
Google/MSDN/Technet turn up nothing on multiple searches. Has anyone else run into this problem?
My installation account is a local admin on both machines, so is the sql cluster account. For the life of me I cannot figure out what's different for an x64 install vs 32bit....
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Mar 13, 2008
Hello,
We currently have a 2 node Active/Passive 2 named instance SQL 2000 cluster. We will be chaning the configuration to Active/Active, basically moving 1 instance to the passive node (so we can take advantage of the resources on the passive node).
We would also like to add 3 nodes to the cluster making it a 5 node SQL cluster. What we are thinking of doing is basically making it an Active/Active/Active/Active with the 5th server being passive. The question I have is will I be able to add and install the 3 new nodes without having to redo the SQL cluster? Should I install the two new active nodes with the default SQL instace or do I have to install SQL with named instances? (actually I think the named instances is the way to go but then I wouldn't be posting here if I was sure about the answer).
Thx!
-Albert-
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Mar 4, 2015
We have 5 instances on our clients old machine with SQL 2005, now they want us to move on cluster environment with SQL 2012.
Once I have installed and configured SQL cluster with single instance, but how to install SQL Cluster environment for Multiple instances.
Should I install all the instances first and than have to configure cluster ?
OR
Is there any way that first I will install cluster and than we can add the instances ?
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Jul 14, 2015
What I have- Sql server 2012 (Standard Ed) Cluster on Windows 2012 R2 with both instances running on the same node- just to save on License, i.e. technically it’s Act/Pas cluster.
What I am looking for- how to configure cluster (e.g. via quorum, etc) to force both instances failed together? Means if for some reason 1-st instance will fail to node 2 another instance should follow (otherwise it will be Act/Act cluster and 2-nd license is required).
If there is no standard way (cluster configuration I mean) to do it I should create some custom process to monitor where each instance is running.
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May 23, 2006
My question is, I'd like my actual cluster to have 4 servers. The virtual server that will be running SQL 2005 will only be installed on 2 of those nodes. Will this work or do I have to split my cluster in to 2 to meet the SQL Server 2005 2 node failover limitation? A basic config for the cluster would be like below....
ClusterSQLNode
Active SQL 2005 Server
ClusterExchNode
Active Exchange Server
ClusterAppNode
Active Application Server
ClusterFailoverNode
Failover SQL 2005
Failover Exchange
Failover Application
Will SQL 2005 install in a 4 server cluster if I only install it on to two of the nodes? Any potential gotchas?
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Jan 21, 2015
Can we add physical nodes and VMs to windows cluster?
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Nov 22, 2015
I have encountered issue by add a node to SQL cluster
Server 2012 R2 Datacenter version
SQL 2012 Enterprise edition
Error Status>
number of cluster nodes supported for edition - failed
I have failed to bypass with Setup /SkipRules=Cluster_VerifyForErrors /Action=AddNode
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Sep 9, 2015
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:
WSFCÂ
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:
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May 12, 2015
Can we backup a DB from SQL Server 2012 (Ent. edition) two node cluster to a local disk ?. Is it possible ?
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Apr 10, 2014
I ran the Advanced cluster preparation for a new sql instance on an existing cluster.
Slq Server 2012.
After is completed, it was successful, I realized I specified the wrong Instance Root directory.
Is it possible to remove what the preparation installed? Or is it possible to change the root directory?
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Feb 18, 2014
I´ve been reading that SQL Server 2012 Always On is dependent on having a Windows Failover Cluster setup. Is that correct ?
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Apr 12, 2015
I'm looking at installing 2008R2 and 2014 side by side, then using Mirroring to provide HA for the 2008R2 instance and AoHA for the 2014 instance. I'd be using the same two physical servers for both the Mirroring pair and the AoHA pair.
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Apr 13, 2015
I got this situation where my network admin observerd that there is a high network utilization between 2 nodes in our AG (the primary node & the DR site, 2 separate locations of course); then he advised to compress the data transfer between those 2 nodes as the previous DBA already did that before!
Ok, I have no clue about this, so decided to google it, got nothing. My backup is already compressed through some third party app (just in case if that matters to the subject).
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Oct 1, 2014
Is there a performance limit on the number of indexes per table / database ? With Filtered indexes there appear to be many more opportunities for more finely defined, and therefore smaller indexes resulting in many more indexes on a single table.
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Apr 24, 2014
Scenerio : To keep a very large system running optimally in a VM cluster, Take PR01 and make PR02, PR03, PR04. Distribute the 45 databases and 9T+ of disk across multiple VM guest.
Each PR## is a SQL Server 2012 Enterprise guest on a VM 5.1 cluster.
So instead of PR01 needed 16 core and 128g of memory, each one will have 4 core and 32g of memory. Making VM HA more manageable. (yes, DRS rules will apply). Also provides more HBA paths and distributes i/o over more physical disk on the SAN.
Instead of a connection string having to know PR01.dbo.UserDB01, PR02.dbo.UserDB03, ect the connection would be PRDB.dbo.UserDB01. That way if needed 1) UserDB can be moved to any of the PR## 2) new PR05, PR06 can be added as needed. The end user and processes are not allowed to touch system databases, no PR## will have a user DB called the same name.
There are seperate VM guests on other VM clusters and Citrix servers that need access to PRDB. As things expand and move around, none of the connection strings need to be changed.
I am looking into RadWare and modifing level 7 information, but that is iffy and $$$$$$.
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Sep 17, 2007
I am just wondering how can I retrieve only the leaf node from the table below
Region
RegionID RegionPID RegionName
1 Null South
2 Null East
3 Null Central
4 3 Central CBD
5 3 Central - East
6 3 Central - West
7 1 South-Yarra
8 4 China Town
9 4 Korean Town
....
What i would like to do is retrieve all the region name which is the lowest level from the tree
e.g only those records below will return
5 3 Central - East
6 3 Central - West
7 1 South-Yarra
8 4 China Town
9 4 Korean TownCould any one help? Thank you
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Jun 3, 2014
I have been using the software, and it has been working fine (on windows user A). Now, I have created another windows user (User B), and would like to use the same software/database. The software launches fine (User B), but cannot access the created SQL database (created with user A)
How do I setup the database to allow access from all users on the same PC?
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Feb 6, 2015
I have backed up databases from a 2008 server and now I would need to restore them to a 2012 , the only issue is that I need a script bcuz I have over a hundred databases.
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May 28, 2015
I have a 2012 AlwaysOn DB Mirroring environment set up with two nodes. Both have 5 installs of SQL named instances.
The issue we are having is when we patch one server and fail everything over, some of the applications will error. Some of the applications had to have their web.config files updated with hostinstance name because it seems to not work with DNS.
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Apr 11, 2000
I have SQL 7 running on an Active/Passive Cluster configuration. My problem is that I can not see any
SQL objects listed on perfmon.
Can this be because of the Cluster configuration? I trying to run perfmon directly from the main system console.
Thanks,
Randy
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May 20, 2007
I have a database that stores the information of a third party system. The system where the database is running has reached its performance and hardware upgrade limits. I don€™t want to separate the database objects in two different database servers. How can I add a second server to increase performance? A cluster will help me in this case? Or there is any other way to group servers for performance?
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May 19, 2014
i have database which has 25 tables. all tables have productid column. i need to find total records for product id = 20003 from all the tables in database.
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Jun 5, 2014
We have a Silverlight based application which currently supports only one production version. Idea is to support three concurrent versions of the same application and user will switch to the newer versions based on their interest or they can still continue with the older version.
We still have to use the existing database for all these three versions.
What is the best way to architect this so that we can differentiate the code between the versions and still keep the data in sync and run all the versions in parallel.
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Mar 17, 2014
I am testing out a blank database created over two physical files on two separate disks with one table called data which has one column called values nvarchar(max).
I filled the table up with a whole load of data and ran a select * against it. If I run Permon at the same time I can see that the read load has been spread over multiple disks as each of these disks is getting read from in parallel. If I create the same database on a single file and run the same select * again it takes much longer, proving that the read load has been distributed across multiple disks.
Now moving onto writes, this is where the confusion lies. I understand that SQL server fills files evenly until they need growing, after which it will then fill files individually until they are full in a round robin fashion unless you have trace 1117 turned on. What I don't understand is why the writes aren't distributed out whilst it is filling these file groups.
I ran an continual insert into my table with go 1000000 to monitor how the files are being filled up. I monitored where SQL server was physically placing the files as they were being inserted by running the following query:
;WITH CTE AS
(SELECT
sys.fn_PhysLocFormatter (%%physloc%%) col1,
RIGHT(LEFT(sys.fn_PhysLocFormatter (%%physloc%%),2),1) AS [Physical RID],
DATAID
[Code] ....
I could see that it would a thousand or so records into file 1, then a thousand or so into file 2, then a thousand or so into file 1 etc etc. In another words it would hit one disk, then another disk, then back to disk one to fill the file evenly. Is there any way to make SQL Server distribute the writes out in parallel so that both disks are writing in tandem?
By the looks of it, multiple disks only scale reads, as with writes only one disk is ever written to at once which is annoying. Any way to harness the write power of multiple disks?
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