Clustering For Availability And Performance
Aug 19, 2007
Hi,
I'm a businessperson, not a software engineer, so please bear with me if my questions seem simple.
We are about to migrate from MS SQL Server 2000 to 2005. In our 2000 deployment, we have a primary server, with real-time replication to a backup. If we have a hardware failure, we do a manual failover to the backup server. This has served us well for years, with decent performance and no data loss. The SQL server is accessed by a pair of IIS servers, which use network load balancing to split the load between them.
As part of the forthcoming migration to SQL 2005, we are going to a hardware platform with 2 SQL servers sharing a single storage array. We would like to get the performance benefit of utilizing both of the SQL servers to handle requests simultaneously, and not just have the second server as a backup. Ideally, the two IIS servers would dish requests to both SQL servers, either randomly or in some sort of load-balanced manner.
So here is my question: how can we have both SQL servers active and handling requests simultaneously, achieving both high perfromance and high uptime?
If it is not supported natively in SQL Server 2005, is there a third-party software solution that can achieve this?
Finally, where else should I go to do further research on this subject?
Thanks in advance for any help you can offer.
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Jun 22, 2015
We are trying to build HA and DR environment, combining AG and FCI. So we have 3 servers added to a cluster, 2 of them sharing the same storage and working as ACTIVE-PASSIVE cluster instance. The other server has a stand alone instance with its local storage, with the same drivers letters as the cluster instance.
Between the Active FCI and the Stand Alone, we set up an Availability Group. They are running fine, except by the listener. When the stand alone instance owns the Primary Replica, I am able to access the SQL Server instance by the listener, but when the Primary Replica is owned by the FCI, I can't reach the database by the listener (name or IP).
I've opened the same ports in both servers, it hasn't worked though.
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Nov 23, 2007
Hi all,
We have 2 database servers with same configuration.
One is Development server and the other is Production server. The Production database server is clustered.
We find the same queries taking more time in the Production server which is a clustered server.
Will the clustering affect the performance in any way.
Any help would be appreciated.
Thanks,
Hariarul
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Nov 27, 2007
I think this question has been asked number of times. However, I amlooking for some specific information. Perhaps some of you can helpclose the gap. Or perhaps you can point me towards right direction.Perhaps this group can help me fill in ms-sqlserver related followingquestions.1. Do this database have data Clustering capabilities?1a. If yes, what mechanism is used such as shared disk, share nothing,etc.2. Do these dB have Security features?2a. If yes, what security features are supported? For instance do theysupport encryption or SSL connection?3. How does the database perform and what is the criteria for theperformance matrix?4. Do they have inbuilt load balance capabilities?I want to thank everyone for taking your time to read thiscorrespondence. I will also greatly appreciate your efforts in sharingyour thoughts.Regards,Manish
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Nov 13, 2007
We have 2 env. : Testing and Production, both are running Windows 2003 Enterprise Server with SQL Server 2005. The difference is Testing is NOT running Windows cluster but Production do so, what is the best way to transfer a database from testing to production?
We have another systems that both testing and production are running on NON-cluster and we use backup/restore to transfer the database, can it apply in this case.
And I found that there are a tools called DTC, which can transfer all DB objects from one DB to another, is it a best way to transfer between non-cluster and cluster env.?
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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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Sep 12, 2004
1. Use mssql server agent service to take the schedule
2. Use a .NET windows service with timers to call SqlClientConnection
above, which way would be faster and get a better performance?
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Jun 23, 2006
Hello Everyone,I have a very complex performance issue with our production database.Here's the scenario. We have a production webserver server and adevelopment web server. Both are running SQL Server 2000.I encounted various performance issues with the production server with aparticular query. It would take approximately 22 seconds to return 100rows, thats about 0.22 seconds per row. Note: I ran the query in singleuser mode. So I tested the query on the Development server by taking abackup (.dmp) of the database and moving it onto the dev server. I ranthe same query and found that it ran in less than a second.I took a look at the query execution plan and I found that they we'rethe exact same in both cases.Then I took a look at the various index's, and again I found nodifferences in the table indices.If both databases are identical, I'm assumeing that the issue is relatedto some external hardware issue like: disk space, memory etc. Or couldit be OS software related issues, like service packs, SQL Serverconfiguations etc.Here's what I've done to rule out some obvious hardware issues on theprod server:1. Moved all extraneous files to a secondary harddrive to free up spaceon the primary harddrive. There is 55gb's of free space on the disk.2. Applied SQL Server SP4 service packs3. Defragmented the primary harddrive4. Applied all Windows Server 2003 updatesHere is the prod servers system specs:2x Intel Xeon 2.67GHZTotal Physical Memory 2GB, Available Physical Memory 815MBWindows Server 2003 SE /w SP1Here is the dev serers system specs:2x Intel Xeon 2.80GHz2GB DDR2-SDRAMWindows Server 2003 SE /w SP1I'm not sure what else to do, the query performance is an order ofmagnitude difference and I can't explain it. To me its is a hardware oroperating system related issue.Any Ideas would help me greatly!Thanks,Brian T*** Sent via Developersdex http://www.developersdex.com ***
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Apr 13, 2001
I want to run remote procs from a local - central proc, but don't want to crash my proc if the remote NT Server or SQL Server is not available.
So, I want to test for NT and SQL availability first.
Here's my code.
====================
DECLARE
@DBName varchar(22),
@QueryString NVARCHAR(130),
@Resultsint,
@ResultsTxtvarchar(31)
/* I find the server-dbasename name in a lookup table, and then build dynamic script */
SELECT @DBName = "<SRVRNAME~DBASENAME>"
SELECT @QueryString = N'master..xp_cmdshell "ECHO >'
+ SUBSTRING(@DBName, 1,6)
+ 'pipesqlquery", no_output'
EXEC @Results = sp_executesql @QueryString
SELECT @Results /* <-- testing here.... */
=====================
If the NT / SQL is running, "@Results" should = 0 (success on the ECHO to the PIPE)
If the NT / SQL is NOT running, "@Results" should = 1 (error on the ECHO to the PIPE)
If I test in QA, I get the expected "@Results" values.
If I run the proc, I get "@Results" = 0 for both events, and them my proc fails on the remote proc call if the NT / SQL is NOT running.
I don't know how to write DMO in TSQL to try that.
I have also tried using 'odbcping' too.
HINTS? Better way to test remote NT / SQL is NOT running?
Thanks in advance.
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Mar 2, 2004
Hello everybody,
We are starting new project
Customer validation with minimum wait time.
How to insure High-Availability?
We have 2 standard servers and in past used custom log shipping.
Log shipping still requre manual intervention ,while goal to switch
between servers automaticly.
Clustering is a last possible solution.
Could someone recomend any other soluion or products?
Thank you
Alex
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Feb 11, 2005
Hi,
I want some help for this particular scenario.
I have more than 350 Databases growing on an average of 5 Databases per month.
I am concernd about the DR Strategy to be adopted.
Can any one help me
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May 22, 2007
i'm not fluent with sql and i have a question to ask..
if i want to check whether a product is available between two dates, how can i do so? for example, i want to check whether it's available between 5/23/2007 to 5/25/2007..
thanks
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Nov 23, 2005
My problem is trying to calcuate whether a room is booked during a dateperiod.I have a table with two columns (Start and End date).I need some SQL code to calculate whether a room is booked during a daterange.e.g.The booking entry is:Start21/11/2005End25/11/2005Any help on this would be appreciated.The End Date indicates the last night of the stay.Regards,Steven*** Sent via Developersdex http://www.developersdex.com ***
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Jan 20, 2006
I am in the process of setting up server replication using the Central Publisher Model. We are doing this for application availability. The application is a .NET app and this application uses the SQL Server name in the connection string. As far as I know we can€™t have two severs on the same domain with the same name. So if our primary server (server A) goes down and that server name is in the connection string how does the application get redirected to our backup server (server B). Thanks for the help.
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Nov 17, 2007
Carer and patients.
Carer should be at work with patient
each carer gives his shedule day by day exple:
carer1
monday
from 02/01/2000 15:30 to 03/01/2000 15:30
tuesday
from 03/01/2000 15:30 Ã 04/01/2000 15:30
wednesday
off
thursday
from 05/01/2000 10:00 to 05/01/2000 12:00
thursday again 05/01/2000 14:00 to 05/01/2000 16:00
and so on...for staff2 and staff3...
Question : witch staff is available for patient x who need a carer from 02/01/2000 15:30 to 04/01/2000 15:30
Note : carer mast be available all long of the duration of help
Thanks
structure table(id,start,finish,idstaff)
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Dec 5, 2006
Hi,
I am in the midst of designing a new Data Warehouse system. As we get further into the design of the system, the more we are realising how complex our ETL is going to be and that the amount of time it will take to run could be significant i.e. a few days! My question is obviously I don't want to have a down time in my relational system for this long and prevent my users from accessing the data for days at a time each month. So what functionality should I be looking at to allow me to maintain a working copy of the data that users can query whilst I perform database updates and then perform a quick promotion of the updated data to users for querying?
If you can point me in the direction of the right functionality in SQL Server 2005 and possible some relevant white papers that cover this sort of scenario I would be grateful.
regards
Colin
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Oct 24, 2007
I have a large db that goes through regular maintenance
every week. The problem seems to be that while the db is re-indexing some of my
key tables I get time out errors. Are there any suggestions on how I can combat
this problem. Management has tasked me
with having 24 hour access to the db because if people aren’t completing there
transactions we don’t get paid. I have
also noticed the timeout issue when we are running in files that create new
records. Is this a basic problem with
the way the db is structured? Are they
any tools that I can use to change our process so that we can maintain the 24
hour access to the db. How are other
companies maintaining 24 hour access to there db?
Thanks in advance.
Don
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Jan 19, 2003
Hi,
I am new in SQL SERVER.I wanted to setup high availability database.It would be great if any one could answers my questions please.
-What are the options availability for HA except clustering?
-How to set up log shipping HA ?
-How to monitor log shipping?
-Is standby DB and log shipping same ?
-Can I setup log shipping without backup/restore method.Like I have to create db1 on server A and create db1 on server B and then configure log shipping?
-Is it necessary to ship log for master database or only user Database?
Thx
-Blace
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Oct 27, 2013
I have to describe Microsoft SQL High Availability options in the following layers: infrastructure, middleware and application. I know there are following options available: failover clustering, replication, mirroring and AlwaysOn but I am not sure in which layer each of them are.
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May 17, 2004
I have implemented log shipping between 2 databases, the transaction log size normally between 10mb - 50mb every 15 minutes during normal working hours, but it grows to 9GB when we run database optimization job and that makes it hard and long to transfer and apply the transaction log on the other database. Does anybody encountered a situation like this and is there a way to minimize the size of the Trans log after the optimization job?
Thanx
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Jun 12, 2007
hi all,
how do i left join some table just to check the availabilty of the data.. say... if id in tblA exists in tblB, how do i just select say flag='Y' without joining the data in tblB that could have more than 1 record ?
tblA
a1
a2
tblB
a1
a1
a1
i dont want to select what i join in tblB, just to check the availability... so in this case :-
a1 ----> Y
a2 ----> N
~~~Focus on problem, not solution ¯(º_o)/¯ ~~~
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Feb 21, 2007
Hi Everyone,I'm working on a site that is running MS SQL 2000. They performregular backups of databases and log files and in the event of adisaster they have a second backup server.At present they regularly copy the backup up files from the productionserver to the standby server. The plan, in the event of a disaster, isto restore these backups onto the standby server and change the dnsrecords so that client machines will point to the standby server.Is there a better way?Thanks for any advice,Danny
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Jul 11, 2007
Hi Guys,
I'm in need of your help. Before running my dataflow task i want to check sql server availability on the network.
If not found then i want to stop the processing of the package.
My last post also has the same question but it wasn't answered yet so......... just check the 2nd last post and the last post:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1834575&SiteID=1
Is there are way to check from SSIS package?
Thank you
Gemma
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Nov 18, 2006
Hello everyone,
I have an ASP application mainly connected to one SQL database that works great but now I am trying to add some functionality that requires to connect to another remote SQL server. Till now all is fine except that the remote SQL server is not always online and of course when this happens my ASP application stops with the following error:
Error Type:
Microsoft OLE DB Provider for SQL Server (0x80004005)
[DBNETLIB][ConnectionOpen (Connect()).]Specified SQL server not found.
in my Global.asa I setup my session variables for DSN connections and in my pages I call my SQL connection as follow:
Set Conn = Server.CreateObject("ADODB.Connection")
Conn.Open Session("MySQL")
SQL = "my SQL statement here;"
Set RS = Conn.Execute(SQL)
Every time the page hits the Conn.Open line I get the error if the remote SQL is not online!!!
Is there a way I can check a sort of returned error code holding the connection status before getting to the Conn.Open line???
Any help would be greatly appreciated.
Thx in advance
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Jul 12, 2006
We have a multi-lingual website (English, Spanish and German). We have a table called Posts that is potentially getting really big.
We are in the initial design phase of the database and would like to know what the experts are suggesting to keep our database mean and lean in the long run.
We have been talking about splitting the database up into 3 separate databases, one for English, one for Spanish and one for German. The language specific databases would also be hosted in countries where the language is spoken eg. the German database would be hosted in Germany.
Or maybe database partitioning by language???
Making changes to 3 databases once launched seems like a nightmare. It would be nice to have one main database and maybe 2 (Spanish and German) €œsatellite€? databases or something like that €“ any ideas???.
Any suggestions of how to deal with this problem the best way would be greatly appreciated. We are using SQL Server 2005.
Newbie!
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Jun 16, 2006
We are beginning to design a new application with SQL Server 2005. Our current production environment is slated to be two SQL Server 2005 machines with the databases residing on an EMC SAN. We have requirements to both have automatic failover between servers for availability and also be able to balance the load over two hot servers for scalability.
Can anyone point me in the right direction for things I need to consider in order to be able to implement both of these requirements? Can I implement database mirroring (for failover) and transactional replication (for balancing) given the hardware configuration I'v mentioned? Is more information needed? Where should I turn next?
I am coming off a mainly Oracle background for the last ten or so years with a smattering of SQL Server mixed in. I've tried to hit the ground running on this project, but sometimes find myself hitting the wall running instead.
Thanks,
Larry
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Dec 4, 2000
What is clustering?Why is it done?
Any suggestion appreciated.
Cheers!
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Sep 14, 1999
I need to cluster two NT Enterrpise Servers with SQL 7 running on them. I have been looking all over the Net for info but not much luck. I need to have some specifics. Can you help me with some good sites or books or both? I have tried Microsoft and they had some info but not much.
Please help!
thanks
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Nov 20, 2001
We are in the process of consolidating all our SQL6.5 and SQL7 databases to a single SQL 7 server - once completed we want to setup a 2 node SQL7/2000 cluster on either NT4 Enterprise or W2k Advanced Server. I would therefore appreciate any advice in choosing between the two platforms based on cost, ease of setup & configuration and ongoing reliabilty & uptime etc - we currently have no NT4 Enterprise Servers so would have to purchase these licenses anyway. Correct me if I am wrong but I also understand that setting up a cluster on NT4 Enterprise is considerabely more complicated and time consuming than on W2K Advanced Server? Any advice would be greatly appreciated..
regards
Marcfw
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Oct 13, 2005
I have a job interview and I need to know what type of questions can be asked about working in a cluster environment, I don't have much experience in clustering, can someone please give me an idea?
Thanks in advance!!
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Mar 19, 2001
Can I implement failover clustering between SQL Server 2000 & SQL Server 7.0? Or do they both need to be the same version of SQL Server.
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Feb 14, 2005
I have a question relating more to documentation and support. I'm trying to find documentation on clustering.
I remember quite some time ago I found a white paper that literally walked you through every step involved in setting up a SQL Server failover cluster. I had also found a white paper that walked you through setting up an Active/Active cluster.
I've been going through Microsoft's site, but all I've found are little bits and pieces.
If anyone can point me in the right direction, or even provide a link, etc. as to where to find some good solid documentation, that would be awesome.
Thanks!!
Anthony
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Sep 21, 2005
If i have an activepassive cluster for SQL Server, under what circumstances would it prompt to automatic changeover to the passive cluster ? Failure of the SQL Server, or let's say 1 user database out of 25 becomes suspect?
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