Any Distance Limited For Failover Clustering Solution?

Jan 2, 2008

Could I implement a failover cluster solution on the two DBs which are based in two different cities?

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MS SQL Clustering And Failover

Jul 20, 2005

I have a 2 node Microsoft 2000 cluster with a shared storage device. Iwant to create automatic failover for MS SQL 2000 server. I can dothat wit the following options:1. Active/Pasive (one instance installed)2. Active/Active (More then one instance/virtual sql serversinstalled)I have a question about option 2.Is it possible to have more then one instance/virtual SQL server,service only one database for example loadbalancing. ?, or when youcreate multiple instances/virtual SQL servers, does that mean you havemultiple databases ? If not why does a Virtual SQL server has to betaken over by a cluster node that didnt fail. Then you can actuallyuse option 1. Please advise!The documentation is not very clear on this issues.Regards,Nico de Groot

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SQL - Clustering For Failover SQL - Server

Sep 24, 2002

Hi all,

We are the studying the possibilty of implementing SQL - Clustering for
Failover server.

Are there any third party tools readily available.
Any suggestion or checklist ??

Any suggestions or comments will be appreciated.

Thanks and have a great day.

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Failover Clustering Without SAN && SCSI ?

Jul 20, 2005

Dear Friends,I wanted to configure Failover cluster for SQL Server 2000 on Windows2000 advanced servers.I have only 2 no.s of windows 2000 advanced server m/cs. I dont haveany shared disks and SCSI drives. Can I still configure the Failoverclustering?I would like to know more about the need for the shared disks in theFailover clustering.Please shed some light.RegardsKumar

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Failover Clustering Metadata

May 24, 2007

Does anyone know how to obtain the physical server name that a SQL failover cluster instance is running on through the system tables or other database commands? Thanks in advance.

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Pricing Of A SQL Server Clustering Solution

Jul 20, 2005

I understand that to implement SQL Server clustering solution, it isnecessary to have Win 2K Advanced server. We are looking at 2Nodefailover solution on a 2CPU Pentium box. Is there a site where wecan find out the cost of Win2K and SQL server for this configuration.Thanks.Ravi

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Clustering - Effor With Restore After Failover

Feb 20, 2000

I have two SQL 7.0 SP1 (WinNT 4.0 SP 6.2) Servers using Clustering.

Problem: When SQLBox1 goes down, the Failover sends it to SQLBox2. When
SQLBox1 comes back up, the node stays on SQLBox2, instead of going back to
SQLBox1. This happens over 50% of the time, but not every time. Sometimes
it works fine.

I have done 3 hours of research, and can not find anything on this problem,
can any one a tleast point me in the right direction. I can hardly find any
troubleshooting on this issue. I do have January 2000 of the MSDN Library
installed on my machine if that helps, but there was not much on it in there
either (at least not that I found).

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MS Clustering Vs Hardware Failover Blades

Sep 29, 2004


In evaluating/comparing MS Clustering vs Hardware Failover Blades, has anyone come across any disadvantages/concerns for a Hardware Failover Blades.

Why would you install MS SQL 2000 Clustering when you can use a Hardware Failover Blade and use a SQL 2000 standard edition. e.g In an event a hardware failure occurs the admin manager brings over a standby hardware blade and reassigns it to the SAN (on which OS and SQL 2000) is installed and you are up and running.

Would appreciate any comments and suggestions to compare these solutions.


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How To Configure Email In Failover Clustering

Jun 10, 2015

how to configure email in SQL server failover clustering. I need to configure email to send when node switches from one node to another. best way to configure email in fail over clustering?

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Recovery :: Failover Clustering 2008R2

Jul 22, 2015

I tested the failover clustering for SQL 2008R2.When I stop the SQL server services manully, the failover did not fail to another resource. At the Faiolover cluster manager, SQl server(MSSQLSERVER)  only show the status for offline. I think it should be move to another owner intead of just show as offline.

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SQL Server Failover Clustering Licensing

Mar 14, 2008

I have 2 Windows 2003 r2 servers with a SQL failover cluster installed across the 2 node. Generally I have been running off node1 with node2 as the failover partner. I have purchased the correct licensing for noe1 and from the following I do not need to purchase a license for node2:

Failover clustering is a process where the operating system and SQL Server 2005 work together to provide availability in the event of an application failure, hardware failure, or operating-system error. Failover clustering provides hardware redundancy through a configuration in which critical resources are transferred automatically from a failing machine to an equally configured server to help ensure continuity of service.

When doing failover support, a server is designated as the passive server. The purpose of the passive server is to absorb the data and information held in another server that fails. A passive server does not need a license if the number of processors in the passive server is equal to or less than the number of processors in the active server. The passive server can take the duties of the active server for 30 days. Afterwards, it must be licensed accordingly

My questions are:

1) If I switch my cluster instace to point to node2 for testing node2 in case of a failover, would I need to purchase another licence ? This means I am not doing the repointing because of an 'event of an application failure, hardware failure, or operating-system error' ? Can you please provide information from MS ?

2) How are SQL Licences bound to the windows install in a SQL Server failover cluster configuration ? For instance if node1 legitimately fails due to an 'event of an application failure, hardware failure, or operating-system error' and you failover to node2. Then you think, stuff (forget about) node1 as I have 1 set of licences for SQL Enterprise already and therefore can run with a legitimate licence on node2. Can you please clarify ?

3) I have heard that only one server needs a license in a failover cluster. Then how does this fit in with any of the questions from above:

'The passive server can take the duties of the active server for 30 days. Afterwards, it must be licensed accordingly' ?

In the event of a legitimate failure, node2 would be running off the license purchased. So why are MS restricting the use of it for 30 days ?

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Using Microsoft Clustering For Database Failover Support

Jun 9, 1999

I am looking in to using Microsoft Clustering supported in NT Server Enterprise to provide failover support for 2 database servers running SQL Server 7. I was wondering if anyone had any experience with it--good or bad. I read the white paper and it sounds good, but I'd like to get some real
world application experience.

Thanks for any info.


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Server Failover Clustering - Costs And More Details

Mar 24, 2008

Hi All,

We're planning to install a Server 2005 Failover Cluster and I'd like to find more information about licensing, etc.
Basic questions:

- What is the best O.S. to run? Win 2003 or the new 2008? And what version (datacenter, enterprise)?
- Since I'm going to use 2 machines, will I have to pay for 2 licenses (sql and windows - two lic. each)? Or just 1 license, since just 1 machine will be the active server?

This is for some web applications, so, web environment.

Any help?

Thank you!

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SQL Failover - Mirroring, Log Shipping, Clustering, Load Balancing

Jun 14, 2007


I am confuse and cant decide on how to setup high availability on our SQL 2005. Here's what on my mind and on resources list:

I plan to have mirroring on my SQL1 to SQL2 with the help of SQL3 as witness. So this would be automatic failover. My idea on mirroring is when SQL1 goes down, SQL3 would tell SQL2 to run and be the primary. It will automatically failover to SQL2. Right? My questions are:

1) How can I revert back to SQL1 once it is ready?

2) I read in one of the post that it is impossible to write in a mirrored DB, is this true? I mean, what's the use of failing over to the next node when it's not possible to write and update data/records?

3) If number 2 is false (i hope so), how would the data be synchronize from SQL2 back to SQL1. Those transaction that were made while SQL1 is down.

4) How about the connection string from the web applications? Would it be automatically point to SQL2? We have load balancing setup in place, would this help web application connection to automatically point to SQL2?

Another setup:

We have SAN in place (not yet used, but is planning to use for this SQL thing), EMC to be specific. My question would be:

1) For SAN setup, the data storage would be centralize. So would that mean that SQL1 and SQL2 services will use the same data and log file from the SAN storage?

2) How would you call this setup then? Can this be clustering type of high availability? Will clustering work under load balancing setup? I believe mirroring is not possible here? Right?

3) How can I setup my 3 SQL servers with the same theory in mind: when SQL1 goes down, SQL2 will take over. Data will be synchronize when SQL1 is up and running again. With automatic failover and reverting back to primary.

I read so much topics about this, but the more I research, the more I get confuse.

Any suggestions, comments, advice is greatly appreciated!

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Will SQL Server 2005 Failover Clustering Still Work When The Database Level Is Set To 80?

Nov 2, 2006

We want to use sql 2005 failover clustering feature, so that upgrade sql 2000 is necessary. But some of the stored procedures built in 2000 are not working directly in 2005, set the compatibility level to 80 could make them work. In this case, can somebody here tell me if down grade the database level will affect failover clustering running properly? e.g. will data still be synchronized properly? Thanks in advance.

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Setup And Upgrade :: Cluster Group (Available Storage) Reserved By Windows Failover Clustering

Jul 28, 2015

I am setting up my first sql node on a 2 node cluster and runing into this

The disks are already added into the failover cluster manager

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SQL Server Admin 2014 :: AlwaysOn Failover Cluster Session Failover

Oct 29, 2015

1. Once fail over to secondary replica, what will happen to connected session in primary node? can the session fail over to secondary seamlessly or need to re-login. what happen committed transactions which has not write to disk.
2. Assume I have always on cluster with three nodes, if primary fails, how second node make write/ read mode.
3. after fail over done to 2nd secondary node what mode in production(readonly or read write).
4. how to rollback to production primary ,will change data in secondary will get updated in primary.

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No Failover And Client Crashes ODBC DSN Setting For Failover In Connection String

Mar 3, 2007

We have set up Mirroring with a witness server and everything works fine when we failover from the SQL Management console.

However, if we failover when our Maccola client is connected, the client blows up - clearly because it can no longer connect to the database.

The ODBC DSN used by the Maccola client shows a checkbox for the 'select a failover server' but the checkbox is grayed out.

Also the summary of settings for the DSN at the end of the wizard reveals that the failover to server (y/N) option is set to N.

The default setting for this DSN is 'populate the remaining values by querying the server' but it doesn't appear to be getting the settings for failover from the server or any other interactive DSN settings either. The server is clearly set for mirroring.

Another suspicious item is that the DSN cannot connect to the server with SA permissions, even though the server is set to mixed security and we use the correct authentication.

Is it possible that the client MACHINE is not authenticating with the domain or sql server properly. We are logged into the client with the domain account that is the SQL admin account on the sql server box.

We should be able to interact with the sql server settings through the ODBC DSN on the client shoulnd't we?

Are we missing a service pack on the client?



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Recovery :: AlwaysOn Failover Cluster And Active Sessions Failover Scenario

Oct 29, 2015

1. In alwaysON fail over cluster, Once fail over to secondary replica, what will happen to connected session in primary node? can the session fail over to secondary seamlessly or need to re-login. what happen committed transactions which has not write to disk.

2. Assume I have always on cluster with three nodes, if primary fails, how second node make write/ read mode.

3. After fail over done to 2nd secondary node what mode in production(readonly or read write).

4. How to rollback to production primary ,will change data in secondary will get updated in primary.

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Transfer A Database From Non-clustering To Clustering Env.

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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SOLUTION! - VB.NET 2005 Express And SQL Server 2005 - NOT Saving Updates To DB - SOLUTION!

Nov 30, 2006

VB.NET 2005 Express and SQL Server 2005 Express - NOT saving updates to DB - SOLUTION!


The following article is bogus and confusing:

How to: Manage Local Data Files - Setting 'Copy to Output Directory' to 'Do not copy'

You must manually copy the database file to the output directory
AFTER setting 'Copy to Output Directory' to 'Do not copy'.

Do not copy

The file is never copied or overwritten by the project system. Because your application creates a dynamic connection string that points to the database file in the output directory, this setting only works for local database files when you manually copy the file yourself.

You must manually copy the database file to the output directory
AFTER setting 'Copy to Output Directory' to 'Do not copy'.


The above article is bogus and confusing.

This is rediculous!

This is the most vague and convoluted bunch of nonsince I've ever come accross!

Getting caught out on this issue for the 10th time!
And not being able to find an exact step-by-step solution.


I've tried it and it doesn't work for me.

Please don't try what the article eludes to as I'm still sorting out exactly what is supposed to be happening.

If you have a step-by-step procedure that can be reproduced this properly please PM me.

I would like to test its validity then update this exact post as a solution rather than just another dicussion thread.

Many thanks.

This is the exact procedure I have come up with:

NOTE 1: DO NOT allow to copy the database into its folders/directorys.

NOTE 2: DO NOT hand copy the database to a folder/directory in your project.

Yes, I know its hard not to do it because you want your project nice and tidy.
I just simply could NOT get it to work.
You should NOT have myData.mdf listed in the Solution Explorer. Ever.

Create a folder for your data following NOTE 2.

Copy your data to that folder. * mine was C:mydatamyData.mdf

Create a NEW project.

Remove any Data Connections. ( no matter what)

Save it.

Data | View Data Sources

Add New Data Source

select NEW CONNECTION ( No Matter what, do it!

Select the database. * again mine was C:mydatamyData.mdf

Answer NO to the question:
Would you like to copy the file to your project and modify the connection?
- NO ( no matter what - ANSWER NO ! - Absolutely NO )
Then select the tables you want in the DataSet.
and Finish.

To Test ----------

From the Solution Explorer | click the table name drop down arrow | select details
Now Drag the table name onto the form.

The form is then populated with a Navigation control
and matching Labels with corresponding Textboxes for each field in the table.

Save it.

1) Run the app.

Add one database record to the database by pressing the Add(+) icon

Just add some quick junk data that you don't mind getting lost if it doesn't save.

YOU MUST CLICK THE SAVE ICON to save the data you just entered.

Now exit the application.

2) Run the app again.

And verify there is one record already there.

Now add a second database record to the database by pressing the Add (+) icon.

NOW add some quick junk data that you WILL intentionally loose.

*** DO NOT *** press the save icon.

Just Exit the app.

3) Again, Run the app.

Verify that the first record is still there.

Verify that the Second record is NOT there.
Its NOT there because you didn't save the data before exiting the app.

Proving that YOU MUST CLICK THE SAVE ICON to save the data you just entered.

Also proving you must add your own code to catch the changes
and ask the user to save the data before exitiing or moving to another record.

As a side note, since uses detached datasets,
(a copy/snapshot of the dataset in memory and NOT directly linked to the database)
the dataset will reflect all changes made when moving around the detached datasets.
Otherwise, they will simply be discarded without notice.


I hope this saves me some time the next time I want to start a new database project.

Oh, and uh, for anyone else reading this post.

Barry G. Sumpter

Currently working with:
Visual Basic 2005 Express
SQL Server 2005 Express

Developing Windows Forms with
101 Samples for Visual Basic 2005
using the DataGridView thru code
and every development wizard I can find within
unless otherwise individually stated within a thread.

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Nearest Distance

Jan 21, 2004

How do I get a nearest distance of a point? For example, I have two tables A and B and I want to find the nearest distance between the records of the two tables. In addition, one of the tables should also give me the distance. The data I have geo spatial data. Can this be done in SQL
Help will be appreciated

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Mirroring Over Distance????

Mar 1, 2007

Is there a recommended practice for mirroring in regards to distance? Is it best practice to mirror with both nodes at the same physical location and use another method for failing over to a remote location or can one just put the other node in the mirror a few thousand miles away? I'm suspecting not.

Any comments??

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Edit Distance

Mar 18, 2008

please, it is possible to know the edit distance used in the fuzzy lookup/grouping.
On this forum I read fuzzy lookup use 4-gram with fix size.
Does exist any document explaining how fuzzy lookup calculate the similarity? In other word, what kind of edit distance, algorithm is used by fuzzy lookup/grouping?
I hope I was enough clear with my poor english.
Thanks All

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Help W/ Distance Calculation Query

Mar 28, 2007

I'm trying to run a dyncamic query that returns all records within a specific distance of a certain point. The longitude and latitude of each record is stored in the database. The query is constructed from two dynamic variables $StartLatitude and $StartLongitude with represent the starting point.

SELECT UserID, ACOS(SIN($StartLatitude * PI() / 180) * SIN(Latitude * PI() / 180) + COS($StartLatitude * PI() / 180) * COS(Latitude * PI() / 180) * COS(($StartLongitude - Longitude) * PI() / 180)) * 180 / PI() * 60 * 1.1515 AS Distance
FROM HPN_Painters
HAVING (Distance <= 150)

It runs fine until I add the 'HAVING (Distance <= 150)' clause, in which I recieve the error: Invalid column name 'Distance' It seems that Distance cannot be referenced in the HAVING clause.

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Distance Between Postal Codes

Jul 23, 2005

I'm looking to find out how I'd go about setting up a database where avisitor to my site could punch in their postal code, and find out how farthey are from another postal code. For example, AutoTrader has this featureI believe to tell you how far the vehicle is from you. Dating sites havethem so you can do proximity searches.Anyone have any ideas where I could start? I'm thinking the post office,but if anyone else has suggestions, I'm open to hear them.Thanks!

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Database Mirrors Over Distance

Mar 20, 2007

Various posts have noted that mirroring over distance is not advisable or that either async connections should be used.

Are there any limits/recommendations i.e. if two datacenters are a couple of files part with 10GBs fibre links and <50ms response times would this be acceptable for high-availability mirroring?

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Cluster Euclidean Distance

Mar 27, 2007

I am new to data mining so please excuse my ignorance. Lets assume

- i have created a cluser model

- identified 3 clusters ( a, b, c)

- each record consists of 15 columns

- collecting new records( 15 variables) real time

what i would like to do is plot these new records programmatically as i collect them realtime. I assume this new record will belong to one of these three clusters. I believe we can find the cluster this new record belongs to by ' SELECT Cluster()....' and distance from the center of the cluster by ClusterDistance(). To plot this on a 2-dimentional space i need (x, y).

ClusterDistance() could be Y but what will be X.


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Distance Between Two Points Lat/long

Jan 12, 2008

I have a user defined function, I want to determine the distance between the 2 points. I have it working but i'm having a problem getting to print.


Code Snippetcreate function dbo.Distance( @lat1 float , @long1 float , @lat2 float , @long2 float)
returns float



declare @DegToRad as float
declare @Ans as float
declare @Miles as float

set @DegToRad = 57.29577951
set @Ans = 0
set @Miles = 0

if @lat1 is null or @lat1 = 0 or @long1 is null or @long1 = 0 or @lat2 is
null or @lat2 = 0 or @long2 is null or @long2 = 0


return ( @Miles )


set @Ans = SIN(@lat1 / @DegToRad) * SIN(@lat2 / @DegToRad) + COS(@lat1 / @DegToRad ) * COS( @lat2 / @DegToRad ) * COS(ABS(@long2 - @long1 )/@DegToRad)

set @Miles = 3959 * ATAN(SQRT(1 - SQUARE(@Ans)) / @Ans)

set @Miles = CEILING(@Miles)

return ( @Miles )


EXEC Distance '39.943762', '-78.122265', '32.334709', '-96.633546'
PRINT @RC /* in miles */

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Great Circle Distance Calculation

Oct 15, 2007

Great Circle distance calculation
Is there any stored procedure or application that implements Great Circle distance calculation 

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SQL 2012 :: How To Calculate The Distance In Miles

Oct 15, 2015

DECLARE @Latitude NUMERIC(9, 6), @Longitude NUMERIC(9, 6)

DECLARE @MyLatitude NUMERIC(9, 6), @MyLongitude NUMERIC(9, 6)
Set @Latitude = 42.329596;
Set @Longitude = -83.709286;
Set @MyLatitude = 42.430883;
Set @MyLongitude = -82.923642;

Question: How do we calculate the distance in miles between the 2 points.

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Find Data Within 10m Distance Of Coordinates?

Nov 22, 2013

I am trying to write a piece of SQL which gives me a list of enquiries within 10 metre distance of a enquiry.

The idea is to identify possible duplicates.

Table: enquiry

Primary key: enquiry_number

Co-ordinates data fields: enquiry.enquiry_easting and enquiry.enquiry_northing.

I will need to self-search on the same table to find possible enquiries within 10m distance.

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Levenshtein Edit Distance Algorithm

Jun 24, 2005

See here for information about the algorithm. This page has a link ( to a T-SQL implementation by Joseph Gama: unfortunately, that function doesn't work. There is a debugged version in the also-referenced package of TSQL functions (, but this still has the fundamental problem that it only works on pairs of strings up to 49 characters.

CREATE FUNCTION edit_distance(@s1 nvarchar(3999), @s2 nvarchar(3999))
DECLARE @s1_len int, @s2_len int, @i int, @j int, @s1_char nchar, @c int, @c_temp int,
@cv0 varbinary(8000), @cv1 varbinary(8000)
SELECT @s1_len = LEN(@s1), @s2_len = LEN(@s2), @cv1 = 0x0000, @j = 1, @i = 1, @c = 0
WHILE @j <= @s2_len
SELECT @cv1 = @cv1 + CAST(@j AS binary(2)), @j = @j + 1
WHILE @i <= @s1_len
SELECT @s1_char = SUBSTRING(@s1, @i, 1), @c = @i, @cv0 = CAST(@i AS binary(2)), @j = 1
WHILE @j <= @s2_len
SET @c = @c + 1
SET @c_temp = CAST(SUBSTRING(@cv1, @j+@j-1, 2) AS int) +
CASE WHEN @s1_char = SUBSTRING(@s2, @j, 1) THEN 0 ELSE 1 END
IF @c > @c_temp SET @c = @c_temp
SET @c_temp = CAST(SUBSTRING(@cv1, @j+@j+1, 2) AS int)+1
IF @c > @c_temp SET @c = @c_temp
SELECT @cv0 = @cv0 + CAST(@c AS binary(2)), @j = @j + 1
SELECT @cv1 = @cv0, @i = @i + 1

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