SQL 2012 :: Single Multi-Tenancy DB With 100K Concurrent Connections?
Aug 19, 2014
I have a DB that is currently not normalized and will be getting about 100K concurrent users that will mostly be doing Read-Only operations from multiple tables.
I am trying to figure out if I should start thinking of having a DB per client (1000 clients) or if I should normalize the database and keep it as a single DB with good indexes and partitioning.
Hardware is not a problem but 100K concurrent users is.
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Jul 9, 2014
I have the following script -
SELECTDISTINCTLOC.[place-ref] AS 'Place Ref'
,PLA.address1 AS 'Address1'
,PLA.address2 AS 'Address2'
,PLA.address3 AS 'Address3'
,PLA.address4 AS 'Address4'
,PLA.address5 AS 'Address5'
,PLA.[post-code] AS 'Postcode'
,LOC.[location-sts] AS 'Location Status'
[Code] ....
Above is a small example.
As you can see 13 Alamein Avenue is listed twice. This is because it pulls back the former and the current tenancy. I don't want to exclude former tenancies - so I want to pull back the most recent Tenancy Reference for each Place Reference.
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Oct 20, 2015
I want to maintain all configurations in Single table, what is the best way to approach it.
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Mar 16, 2004
Hey,
MSDE 2000 allows 25 concurrent connections.
If these are all used up, and a 26th connection comes in. What happens? is the connection rejected? or does it sit in a queue, waiting to be given a connection?
Thanks,
-Ashleigh
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May 8, 2002
hi
i hv developed an application that runs on the local windows system and interfaces with the MSSQL 7.0 database server using ODBC DSN Connections. This application will be deployed over the LAN with over 100 users.
The MSSQL 7.0 server has only 5 user licenses that limits the concurrent usage to 5 users.
I need a solution whereby all users can access the SQL server database without adding more licenses
Is there a way out.
Please help
Regards
JD
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Nov 30, 2007
Morning
I have been searching hi and low on the web to try and find out typically which version of sql server should be used based on the number of concurrent users you will be having.
I believe that Sql Server 2005 Express should only really be used for up to 10 concurrent users while I seem to remember that Standard edition supports up to approx. 33,000 connections.
Does anybody have this information to hand as I need to write a business case to justify the potential upgrade.
Many thanks
James
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Nov 6, 2003
hey all,
MSDE will only allow 5 concurrent connections to ...
a particular database?
a particular instance?
or a particular server?
ie. if i have one application running on one instance of MSDE with 5 connections and i have another application running on another instance of MSDE with 5 connections. would i actually have 10 connections? **both instances on the same machine...
can someone please clarify.
TIA
Chris
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May 18, 2008
Hi,
I read that there's a "tecnical" limit of 32767 concurrent connections for SQL 2005 Express, and that SQL 2005 Express uses only 1GB of memory. So, what's the number of practical concurrent connections SQL 2005 Express can handle? Is it 200 ,300, 0r 400...? How much memory is consumed by every connection?
Thanks in Advance.
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Oct 22, 1999
Does anyone know how to change the number of conccurent connections on SQL Server 7. We have purchased 10 additional licenses and I need to change the concurrent users from 10 to 20. Any help would be appreciated. Thanks
Phil
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Jul 23, 2005
Hi all !Does someone know how many concurrent connections 2005 Express canaccommodate ? The limit on MSDE was 5 before performance drops considerably.Thanks for your help.Sebastian
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Jun 16, 2006
Hi folks,
That is the question: how many concurrent connections support Microsoft SQL Server 2005?
Thanks in advance,
Javier.
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Aug 23, 2001
How would I go about finding out what my high-water mark would be for concurrent
connections over a period of time (SQL Server 7, SP 3 applied)?
Thanks in advance!!!
Gary Andrews
andrews_gary_w@solarturbines.com
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Mar 4, 2015
I have a table called dbo.PhoneCalls with below columns
PhoneID |PhoneNumber| Callstarttime| CallEndtime|
1 |111-111-1111|2013-04-01 05:13:03.000|2013-04-01 05:13:03.000
1 |222-222-2222|2013-04-01 05:15:12.000|2013-04-01 05:16:52.000
2 |333-333-3333|2013-04-01 05:17:29.000|2013-04-01 05:24:08.000
2 |444-444-4444|2013-04-01 05:21:50.000|2013-04-01 05:22:31.000
2 |555-555-5555|2013-04-01 05:22:41.000|2013-04-01 05:23:11.000
2 |666-666-6666|2013-04-01 05:23:20.000|2013-04-01 05:23:46.000
..........
1. PhoneID is nothing but the participant in the call. PhoneID = 1 is twice from above. Which means 2 particpants (Same call )with 2 numbers with their callstarttime and callendtime. Similarly for PhoneID =2, there are 4 participants. And the list goes on for a day and then for a month.
2. For example a phone call P1 with 2 participants is going on for a particular day. We should not consider the same phone call having 2 participants involved. So that the concurrency would be 2. We have to ignore that here.
3. Only to be considered is other Phone calls for that day. Lets say P1 having call with 2 participants, P2 having some 4 participants which fall in the time period of P1. Then we should consider P1 and P2 the common period
4. In order to find number of concurrent calls happened for a day basing on callstarttime and callendtime. What would be the query?
5. Should consider the Timeperiod or the bucket with 1 hour as the period.
6. A Phone Call P1, Phone Call P2, should have matching (common) time ( keeping all the scenarios) is required for this query.
Result for Concurrent calls for a day should be like below. Should get all the concurrent connections happened for a particular day.
Date|TimePeriod/Bucket(hr part)|Concurrentconnections|
Jan-01-2015|01 to 02|3
Jan-01-2015|11 to 12|2
Jan-02-2015|04 to 05|5
Jan-02-2015|12 to 13|13
........
ii) So once the above is achieved.
Have to find the Maximum concurrent connections for day from the above.
For below Maximum Concurrent connections are '3'
Date|TimePeriod/Bucket(hr part)|Concurrentconnections|
Jan-01-2015|01 to 02|3
Jan-01-2015|11 to 12|2
Hence the Result for Maximum Concurrent Connections would be
Date|TimePeriod/Bucket(hr part)|MaxConcurrentconnections|
Jan-01-2015|01 to 02|3
Jan-02-2015|12 to 13|13
.............
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Sep 23, 2014
Disaster Recovery Options based on the following criteria.
--Currently running SQL 2012 standard edition
--We have 18000 databases (same schema across databases)- majority of databases are less than 2gb-- across 64 instances approximately
--Recovery needs to happen within 1 hour (Not sure that this is realistic
-- We are building a new data center and building dr from the ground up.
What I have looked into is:
1. Transactional Replication: Too Much Data Not viable
2. AlwaysOn Availability Groups (Need enterprise) Again too many databases and would have to upgrade all instances
3. Log Shipping is a viable option and the only one I can come up with that would work right now. Might be a management nightmare but with this many databases probably all options with be a nightmare.
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Aug 17, 2015
More often than not, I typically don't touch DTC on clusters anymore; however on a project where the vendor states that it's required. So a couple things here.
1) Do you really need DTC per instance or one for all?
2) Should DTC be in its own resource group or within the instance's group?
2a) If in it's own resource group, how do you tie an instance to an outside resource group? tmMappingSet right?
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Jun 16, 2015
I am STIGing a database and have to create a trigger that will stop any connection from occurring after a certain limit has been reached. For example I set the concurrent connection to 50 so I need a trigger that will stop any connection from all logins happening after 50.
The STIG info:
Rule Title: SQL Server must limit the number of concurrent sessions for each system account to an organization-defined number of sessions.
STIG ID: SQL2-00-000100
The below triggers works, but for only the one login, so how can I have it include all logins for that SQL instance.
CREATE TRIGGER connection_limit_trigger
ON ALL SERVER WITH EXECUTE AS 'login_test'
FOR LOGON
AS
BEGIN
IF ORIGINAL_LOGIN()= 'login_test' AND
(SELECT COUNT(*) FROM sys.dm_exec_sessions
WHERE is_user_process = 1 AND
original_login_name = 'login_test') > 3
ROLLBACK;
END;
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Mar 1, 2006
I noticed that when SqlDataReader is pending, if another page require the same connection the page remain in work tail until SqlDataReader in first page is closed.It is a real disappointment for a multi tasking system like Windows.How to absolutely avoid it?Imports Microsoft.VisualBasicImports System.DataImports System.Data.SqlClientPublic Class var Public Structure varName Public backUserColor, borderUserColor As String End Structure Public Shared Function getVar(ByVal pageCode As String, ByVal level1 As String) As varName Dim connection As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename='G:Documents and SettingsAdministratorDocumentiVisual Studio 2005WebSitesWebSite1App_Datavar.mdf';Integrated Security=True;Asynchronous Processing=True;Connect Timeout=30;User Instance=True") Dim query As String = "SELECT value FROM common UNION ALL SELECT spec FROM spec WHERE pageCode='"+pageCode+"'" Dim command As New SqlCommand(query, connection) connection.Open() Dim reader As SqlDataReader = command.ExecuteReader() While reader.Read getVar.backUserColor = reader.Item(0) MsgBox(getVar.backUserColor, , ) End While reader.Close() connection.Close() End FunctionEnd Class
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Aug 29, 2007
Hello
I created a table adapter with the following query
select * from building where buildingname in (@param1)
I used the query builder to the test the query and it works ok if I pass a single value
ex: name: @param1 value: Building1
but when I use the value: Building1, Building2 then it doesn't return anything
If i do a direct sql: select * from building where buildingname in ('Buiding1','Buiding2') returns many rows.
Now I have a class that has the following function<System.ComponentModel.DataObjectMethodAttribute(ComponentModel.DataObjectMethodType.Select, False)> _
Public Function getBuilding(ByVal building As String) As myDataSet.buildingDataTableReturn adapter.getBuilding(building)
End Function
When I call this function I try to pass the building value sorta like
dim building as string = 'Building1,Building2'
and it doesn't work. I tried a whole bunch of variations.
How are you supposed to format the parameter string?
Thanks
Peter
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Jul 7, 2001
SQL7
If I have a job that runs every minute, and that job happens to take more than one minute to run on occassion, will SQL Server start a second instance of the job or will it be serial - one after another ?
Thanks,
Craig
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Mar 22, 2007
I have a parameterized main report that contains a link to a sub report with parameters. Then from the sub report I have a link that takes you back to main report. If I use multi value parameters or single value parameters the links going back and forth between the two reports works just dandy, when I run it on my PC. However when I deploy the reports to the Web Server, the link going from the sub report back to the main report only works if the parameters are single select. Going from the Main to the Sub it doesn€™t matter.
This is the error I get using multi select parameters going from the sub report back to the main.
The path of the item "(null)" is not valid. The path must be less than 260 characters long and must start with slash. Other restrictions apply. (rsInvalidItemPath)
Any suggestions?
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Nov 4, 2004
Dear All,
I like to know if anyone of you out there can help me solve this issue. I need to generate an SQL Query to access two different FOXPro (databases) connections.
Example,
Connection 1 - has a DSN setup of CMSBM and it sits in the path of D:/CMS/CMSBM/= and the table is bmboml15
Connection 2 - has a DSN setup of CMSMA and it sits in the path of
D:/CMS/CMSMA/= and the table is maprodl15
I am coding in ASP.NET using C#. I have tried the command like:
SELECT codeno, link, type FROM bmboml15 IN CMSBM INNER JOIN maprodl15 IN CMSMA ON bmboml15.codeno = maprodl15.codeno.
Obviously the above query is not a working one and a very poor construction.
Please help!
Thanks
Clo
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Apr 16, 2008
I have a DLL that acts as an interface between the application and the database. So you create a new instance to the database via:
MyDatabaseClass db = new MyDatabaseClass()
Each instance of the class creates a new connection to the database.
So if I were to have the following, then 4 connections would be made.
MyDatabaseClass db1 = new MyDatabaseClass()
MyDatabaseClass db2 = new MyDatabaseClass()
MyDatabaseClass db3 = new MyDatabaseClass()
MyDatabaseClass db4 = new MyDatabaseClass()
My question is...What if instead of creating new connections upon each instantiation, I re-use the same connection through a "ConnectionManager" class. In this way, the above code will only create 1 connection instead of 4.
What do you guys think about each approach? Obviously the 2nd approach makes sense for non-web applications, but what about websites? Would that just cause that single connection to be overloaded??
Thanks for any insights.
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Apr 24, 2007
The latest similar question is almost a year old and hasn't been definitively answered. I'm designing a certificate type report where the declaration text uses static and dynamic text generated in an expression for the textbox. The problem is that there doesn't seem to be an obvious way of formating sections of the text expression with different font sizes, weights and attributes to depict the effect desired. E.g. I want one textbox to say:
This Certifies that {a field value} was blah blah blah by {another field value} etc.
Can this be done in a regular textbox? If not, are there any work-arounds to accomplish the same effect. BTW, I'm working in RS 2005 flavor with VS 2005 Report Designer.
Thanks in advance for your help.
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Mar 5, 2007
I had a multi publisher single subscriber replication in my job and now i want remove it. i disabled the subscriber. Now if i disable the publisher and distributor then it gives me a error cannot drop the distribution DB because it is currently in use. this DB can never be dropped since there is at least one publisher at one time that accesses this DB everytime. How should I disable this publication.
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May 13, 2015
I have created approximately 200lines of multiline table function. getting table variable values as what I need satisfying all our business rules.
my question : is it okay in performance wise using loop i executed this function 100000 times and it took around 16mins.
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May 27, 2015
I have few servers that are VM and different version of SQL Severs (2008 Express/Standard, 2012, or 2014 Enterprise) and seems all of them have same issue that when I am querying "sys.dm_os_performance_counters" for "[object_name] LIKE '%Buffer Manager%' AND [counter_name] = 'Page life expectancy'" I am getting very big number (Ex, above 100K or some servers 1M).Is this number seems fine or acceptable?Â
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Apr 16, 2013
I got issue when passing multiple values to a single parameter. Here is my stored procedure as following:
CREATE PROCEDURE [dbo].[School]
@Grade AS varchar(50),
@Class As varchar(50)
AS
BEGIN
SELECT Name, Grade, Class
FROM School
WHERE Grade = (IsNull(@Grade, Grade)) AND Class IN (IsNull(@Class, Class ))
END
In the front end, I got multiple values for Subject parameters such as Math, English, Reading, etc... in a specified class. How do I can modify my above stored procedure to receive multiple values for a single parameter.
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Mar 4, 2015
I have tried everything I found on Google, but nothing seems to be working. Already Ran alter command set multi_user, but getting an error.
"Msg 5064, Level 16, State 1, Line 1
Changes to the state or options of database cannot be made at this time. The database is in single-user mode, and a user is currently connected to it.
Msg 5069, Level 16, State 1, Line 1..ALTER DATABASE statement failed."
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Jul 20, 2005
is it possible to use a single connection object shared by severaltasks where each task is handled by a thread? these tasks call storedprocedures that return record sets, no editing, update or delete.my objective is that db connection is expensive and each user can onlyhave 1 connection object. each user submits a request to the webserver, and the result web page construction consists of a number ofresult sets obtained from several stored procedure from the samedatabase instance.i could obtained my result sets by making each sp call one at a timebut was thinking whether i could instead break up the tasks, create athread for each task that shares the same db connection objectconcurrently. the connection object will be alive until all tasks arecompleted, that is if the final object ive could be achieved in ashorter time. No connection pooling here.i am wondering over questions like:1. within the same db instance, if 2 stored procedures need to accessthe same table, does SQLserver queue-up and service one request at atime.2. would there be any problem using the connection object this way,sharing between multiple theads?3. is it possible that a 'dead-lock' may occur within the DB?of cos this whole idea can be absurd and into the trash if theconnection object doesn't support multi-thread and is queue based inthe first place.pardon me if my SQL server basics is off track. been doing too manyother things.thanks,meng
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May 1, 2008
Hi,
I'm using SSRS 2005 which connects to SQL Server 2005. I need to pass Multi valus for single parameter...
E.g. Command type : Text
SELECT * FROM COUNTRY where CountryId IN ( @CountryID)
If i tried to preview using single parameter, it shows the record without any problem. However when i tried to put multi values, it gives error message?? I read somewhere which says, need to set to multivalue. But, i could not find the place to set the multi value option...
How to solve it?? Your suggestion/recommendations greatly appreciated.
Thanks
rama
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Jul 2, 2015
I have a sp where query is as below.
DECLARE @ServerCIName varchar(5000)
SELECT * FROMÂ dbo.INC
WHERE Status in ('Assigned','In Progress','Pending')
and Description like '%' + (Select * from SplitDelimiterString(@ServerName,',')) + '%'
and (select DATEADD(dd, DATEDIFF(dd, 0, (Submit_Date)), 0)) = (select DATEADD(dd, DATEDIFF(dd, 0, getdate()), 0))
In place of "and Description like '%' + (Select * from SplitDelimiterString(@ServerName,',')) + '%' ", if I use "and Description like '%' + @ServerName + '%' " and pass a single value, it works.
But @ServerName contains multiple values and it is dynamic (not constant).
How do I query the data?
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Feb 12, 2007
I admit I am a novice to queries and stored procedures but understand stored procedures are more secure, so I am choosing to challenge myself with a stored procedure and have not been successful at all.
What I am looking for is a stored procedure which would query the single table named Hospital, which would search from a single textbox the end user would enter the text they are searching for on a Windows VB application but is dependant on a few end user selected items.
1. The end user can select a radio button either "Starts with" or "Contains"
2. The end user can select from 6 checkboxes (Hospitals, Address, City, State, Zip, Type) to limit or expand their search from the columns in the table.
The table has 17columns (CO, PARENTCO, ADDR, POBox, CITY, State, ZIP, TEL, FAX, WEBSITE, HOSP_TYPE, OWNERSHIP, BEDS, CONTACT, TITLE, Email) but I am only allowing the end user to search by the above 6 columns and need to display the above 6 columns plus the phone, fax and website columns.
After the user clicks the search button it displays the results in a listbox and the user will then select the one they want and it displays the information in another set of textboxes.
Hopefully someone can get me pointed in the right direction! Thanks for your help!
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Oct 20, 2015
I have old editions of SQL Server such as 6.5, 7.0, 2000, and 2005. The biggest hold up we have in retiring these servers is the connection string changes that would have to be made. Any way that I could redirect these calls to a newer SQL Server 2012?
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