Simulate 1,000 Simultaneous Users
Mar 29, 2000How can I simulate 1,000 simultaneous users in my database?
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SQL Express And Simultaneous Users
Aug 14, 2007Greetings!
Are there any limit of simultaneous users and/or connections when running SQL Express? The free license of SQL Express, does that include use by any number of users/devices?
Regards
Harald Hedlund
Number Of Simultaneous Users/connections On SQL Server
Mar 30, 2001Hi,
could somebody please let me know what is the maximum number of simultaneous users/connection per single SQL Server 7.0 box? Licenses are not the issue here, rather the number of physical connections supported before another server needs to be purchased.
Another variation of this question would be what's the highest number of databases that 7can be created on SQL 7.0 server and what is the highest number of physical connections supported per database? Again, licenses are not the issue. Thanks a lot in advance.
How Do I Scale A Database To Handle A Billion Simultaneous Users?
Mar 30, 2007Hi everyone. I hope that my question isn't too broad, but here it goes...
I am trying to figure out the best way to scale a SQL Server database so that it can handle a billion simultaneous users querying the same tables, and can easily scale to handle many billions of simultaneous users. The database must also have 999.99% availability. The number of licences and amount of hardware needed is not an issue.
Thanks in advance.
How Can I Simulate Group_concat In SQL CE?
Apr 24, 2008I am referring to the group concatenation where we get all the values of a single column (of all the rows) grouped into one cell as a concatenated string. I know I can achieve this using temporary tables and cursors in SQL Server. But I cannot have a cursor in SQL CE. I need to add this as a command to a tableadapter in a Dataset Designer. Please let me know if you can think of a workaround.
This is what I want:
Table 1:
Col1 Col2
1 a
1 b
2 c
2 d
2 e
Resultset should be:
Table 2:
Col1 Col2
1 a, b
2 c, d, e
Simulate ROW_NUMBER () In SQL 2000
Nov 22, 2005I would like to generate an incrementing column value to each row found in a query in SQL Server 2000.
View 13 Replies View RelatedSimulate A Row Change In The Replication Table
Dec 17, 2007I have a merge where the subscriber can do changes to its tables ... But as I found out the changes are made only if publisher simulate an row change or changes something effectively
I'm not sure that at every replication the publisher table would be changed so i need something to simulate a change in the publisher table
Can anyone please help me with this ?
How To Simulate Stored Procedure Execution
Jul 27, 2015I want to simulate 100 users simultaneously executing a procedure in sql server (best example would be 100 users using one report with different parameters in ssrs at the same time ). can i do that ?
View 3 Replies View RelatedTransact SQL :: Queries To Simulate INTERSECT And EXCEPT But With Records In Same Table
Jun 5, 2015I have a table (let's call it MyTable) that consists of four fields:
Id, Source, FirstField, and
SecondField, where Source only takes one of two values:
Source1 and Source2.
The records in this table look as follows:
Id
Source
FirstField
Secondfield
1
Source1
Product 3 name
Product 3 description
[code]...
I need to return, using 3 different T-SQL queries:
1) Products that exist only in Source2 (in red above)
2) Products that exist only in Source1 (in green above)
3) Products that exist both in Source1 and Source2 (in black above)
For 1) so far I've been doing something along the lines of SELECT * FROM MyTable WHERE Source=Source1 AND FirstField NOT IN (SELECT DISTINCT (FirstField) FROM MyTable WHERE Source=Source2)
I have read about INTERSECT and EXCEPT, but I am a little unclear if they could be applied in this case out of the box.
Analysis :: DAX - How To Simulate MDX SCOPE Forcing YEAR Level
Jul 19, 2015In my fact table (month granularity), I've got a calculation defined:Â
Margin%=DIVIDE(SUM(Margin);SUM(SalesAmount))
How should I define a calculation based on "Margin%", so that if I browse the Pivot Table by months it would always show the year level result instead? My date dimension is also with Month granularity and it has a Year column in it.Â
SQL Server 2008 :: Queries To Simulate INTERSECT And EXCEPT But With Records In Same Table
Jun 4, 2015Here's the scenario. I have a table (let's call it MyTable) that consists of four fields: Id, Source, FirstField, and SecondField, where Source only takes one of two values: Source1 and Source2.
The records in this table look as follows:
I need to return, using 3 different T-SQL queries:
1) Products that exist only in Source2 (in red above)
2) Products that exist only in Source1 (in green above)
3) Products that exist both in Source1 and Source2 (in black above)
For 1) so far I've been doing something along the lines of
SELECT * FROM MyTable WHERE Source=Source1 AND FirstField NOT IN (SELECT DISTINCT(FirstField) FROM MyTable WHERE Source=Source2)
Not being a T-SQL expert myself, I'm wondering if this is the right or more efficient way to go. I have read about INTERSECT and EXCEPT, but I am a little unclear if they could be applied in this case out of the box.
Simulate Heart Beat Code To Manage Production Servers
Jan 1, 2008
Hi
I am currently developing a DBA management console for a company who have 45 SQL Servers, 20 of which are in the production environment. As part of the development I have created a DBA dashboard with various alerts and information dials regarding the state of the SQL Infrastructure. I came accross a problem yesterday that I cannot find the answer to.
One of the alerts I have developed is a simple "Heart Beat" indicator that displays that the SQL Server is present and "alive". To do this I have a central database running on SQL 2005 which has linked server connections toall 45 SQL Servers. This central database runs a simple select statement on each server (something that I know works if the server is there). The select is run as dynamic SQL as I need to build up the SQL as part of a cursor to place the server name within the from clause. Here is the select I am using: -
select top 1 dbid from [server].master.dbo.sysdatabases
If the server is not there an error occurrs. I trap this and record that the server may not be present. The cursor then moves on to the next server to check.
This works fine when ran from Query Analyser. I can simulate a failed server by deleting the link server connection. For the server in questions an error is raised when the select is run, I store the error and on the Dashboard screen you can see an indicator saying that the server is currently non-contactable (i.e. failed Heart Beat).
My problem comes when I try and schedule this procedure. If I run it as an SQL Agent Job it behaves differently. Here, as soon as the error is detected it bombs out stating that the step has failed. I don't mind it stating that the step has failed, what I want it to do is to complete the cursor loop on all the servers. You see at the top of the procedure I set all the heartbeats flags to 0 (i.e. not contactable) so I need to to complete the run. I have search the Agent set-up and can find no flag to stop it halting processes when an error occurs.
The servers are configured not to allow RPC and I would rather not have to put a job on every server to tell me they exist as this would need managing going forward.
Any help you can offer would be greatly appreciated - Happy New Year by the way!
Simultaneous Snapshots?
May 2, 2006If multiple snapshots for the same report attempt to generate at the same second, is there something in place to prevent them from conflicting with each other?
Our SSRS 2005 application will use a console app that we are writing to change the default parameters on each report and call the CreateReportHistorySnapshot method. This application will be multi-threaded, so there is a possibility that multiple versions of the same report with different parameters will attempt to run at the same time. We need to be sure that these snapshots will not conflict and return the appropriate SnapshotHistoryID for that report run.
From looking at the History table in the ReportServer database it looks like there are uniqueIDs and other keys that would prevent duplicates, but what if the requests come in at the same time? Is SSRS 2005 smart enough to delay for a second so that there is not a duplicate? Since the way you reference these snapshots in your URL is with the Snapshot Time in UTC format, that only goes out to full seconds (2006-05-02T00:00:00).
Sorry for the length, but I could not think of how to condense this.
Thanks,
Steve
Simultaneous DB Access
Mar 12, 2006I have C# Express and the SQL Express Management Studio CTP installed. So far, I've been forced to disconnect from the server in one app to connect to it in the other. I understand there is something around a 4 connection limit in SQLServer Express, so I don't see the problem.
During one of these episodes, SQL Mgmt Studio hung while opening DB properties, then the SQLServer service couldn't be stopped. Now the DB can't be opened even after a reboot.
Help?
Simultaneous Task Limit.
Mar 22, 1999Is there a limit to the # of tasks ( Dumps) to a HD device ,which SQL 6.5 can perform simultaneously?
View 1 Replies View RelatedHow Are Simultaneous Queries Handled?
Oct 22, 2007Hi,
I have an application resource that is accessible from multiple clients applications that all have access to a common SQL Server db. By this, I mean, multiple clients can potentially connect to this resource at any given time. I want to limit the usage of this resource to one client at a time and was thinking about simply using SQL to maintain the name of the client that currently has "control" of the resource.
My question pertains to the case where two clients are executing a SQL query, simultaneously, to check whether someone has control of the resource or not. If two users were to simultaneously execute this query, do i have to lock the table in order to ensure that both users are not viewing data in an incorrect state? Or, does SQL Server ultimately execute the queries in a specific order? Meaning, the requests are simultaneous from a human standpoint but one request may have actually come in a millisecond before the other one and SQL server executes that query first, and then the second query. Is this how it works?
Thanks,
Paul
Maximum Simultaneous Connections
Feb 14, 2008Hi All,
I have a Windows 2003 Server. Planning to use SQL Server to act as the main Database Server which needs to cater to over 100's of simultaneous connections.
Can anyone share with me the default maximum simultaneous connections and the maximum allowed simultaneous connections for the following versions:
- MSDE
- 2000
- 2005 Express
- 2005
Hope I can get more professional advice from you guys.
Thanks.
SSIS Simultaneous Connections
Jul 11, 2006Using the Import/Export Wizard, it is easy to set up SSIS jobs to import multiple tables in one task. However, SSIS appears to grab a connection to the source database and the destination database for each table indicated in the task sometime prior to doing the actual data transfer. Even though the transfer seems to be done a few tables at a time, all the connections are held throughout the execution of the task.
This has two effects:
1. The task may fail if the number of connections exceeds the limit of user connections set for the database
2. There is a severe impact on the other users of the databases (in my case, the source is a production system)
Is there any way to control the number of simultaneous connections that SSIS data transfer packages initiate?
I can, of course, define the package to have a small number of tables (thus limiting the connections), but in real life I need to transfer almost 700 tables, so limiting the number of tables per task to 20 or 25 produces an awkwardly large, and error prone, number of tasks. And since this definition must be done for multiple (not quite identical) databases, the extra effort of defining small collections of tables is signifcant.
Simultaneous Entry In Both Master & Detail
Apr 7, 2008Hi, can anyone help me? I want to know whether is it possible to insert records simultaneously in both master & detail tables?
For elaboration, say there is a master table contains (orderid,orderdate,amount) and details table contains (orderid, productid,qty,price). 1 record of master table associated with n records of details table. Can it be possible to insert both the 1 record at master table with n records in details table in a single sql statement?
Simultaneous Updations And Deletions Between Databases
Jul 20, 2005hello to all,there are two databases named A and B.One database contains employee id as primaryI have another project database which includes that employee id asforeign key. How can I reflect my updations,deletionsthank you in advance,vishnu
View 2 Replies View RelatedExecuting Multiple Simultaneous Reports
Oct 15, 2007Is there a way to get the Report Manager to allow a single user to
execute more than 1 report at a time? Currently, each user can only
have a single report being executed at a time. It looks like any
other reports are being queued and executed serially.
Prevent Simultaneous Package Executions
Oct 23, 2007How can I prevent a package, or a section of a package, from being run more than once simultaneously? The package makes use of a staging database table, and if two copies of this package are run at the same time, there will be a race condition and possible corruption of the data in the database table. I have also noticed that the SSIS logging gets messed up and starts overwriting itself if I have more than one of these packages run at the same time.
What I am thinking of should work the same way as a serializable transaction lock on a normal query, where one query has to wait if another query has a lock on the table. I don't want the package to throw an error, I want it to wait until the other one is done.
I have been trying to use transactions in a test SSIS package, but they are not quite doing what I want them to do. I put various SSIS steps in a sequence container and require a serializable transaction. I have also tried putting the transaction at the package level, but that is not preventing simultaneous package runs.
Is there a built-in way to do this that is easy to implement? Otherwise, what I could do is insert a flag into the database indicating that a package is running, then make sure to reset the flag on any error or on completion. It seems like this alternate method could be error-prone though.
I am using SP2.
Inserting Simultaneous Tables Using Stored Procedure
Feb 8, 2007I am trying to insert into two tables simultaneously from a formview. I read a few posts regarding this, and that is how I've gotten this far. But VWD 2005 won't let me save the following stored procedure. The error I get says “Incorrect syntax near ‘@WIP’. Must declare the scalar variable “@ECReason� and “@WIP�.� I'm probably doing something stupid, but hopefully someone else will be able to save me the days of frustration in finding it. Thanks, the tables and procedures are below.
I made up the two tables just for testing, they are:
tbltest
ECID – int (PK)
SQL Express, Operating Systems, Simultaneous Connections
Sep 28, 2007I was going over this article , and was intrigued by this statement "If SQL Server 2005 Express is running on Windows XP Home, it is limited to five simultaneous connections. If it is running on Windows 2000 or Windows XP Professional, it is limited to 10 simultaneous connections. However, these are limitations of the operating system and not of SQL Server 2005 Express."
What are simultaneous connections? Is this related to Max worker threads defined as 255 on other editions? How does underlying OS impose how many connections can be done to SQL server. And finally how many simultaneous connections can be done in Windows Server 2003?
Simultaneous Execution Of The Same SSIS Package From Code
Jul 26, 2007Hello
I am trying to call the same package with different starting parameters using asynchronous method calls.
My code is
namespace ReconHost
{
public partial class HostContainer : Form
{
public delegate void InvokePackageHandler(
Microsoft.SqlServer.Dts.Runtime.Application app,
int var
);
Microsoft.SqlServer.Dts.Runtime.Application app;
public HostContainer()
{
InitializeComponent();
for (int i = 0; i < 2; i++)
{
app = new Microsoft.SqlServer.Dts.Runtime.Application();
InvokePackageHandler asyncInvokePackageHandler = InvokePackage;
asyncInvokePackageHandler.BeginInvoke(app, i, null, null);
}
}
public void InvokePackage(Microsoft.SqlServer.Dts.Runtime.Application app, int var)
{
Package pkg = app.LoadPackage(@"c:GRSGRSGRSTest_Async.dtsx", null);
pkg.Variables["intVar"].Value = var;
pkg.Execute();
pkg = null;
}
}
}
If I set the for loop to loop just once, the package is executed fine. Any more than once and only one instance of the package is executed.
Does anyone know what I am doing wrong? I know it is possible to execute the two package instances simultaneously because you can use DTexecUI.exe on two clients to do this.
Thanks in advance
Tomo
User Login - How To Control Number Of Simultaneous Connections
Jul 30, 1998Hi everyone!
Is it possible to control the number of simultaneous connections one login id can have?
I`d like to avoid my users to share their login ids and passwords to help them enter data into the system.
Thanks,
Mauricio
HELP: Strange Blocking Performance Problem With Simultaneous Queries
Dec 1, 2005Hello everyone, I am hoping someone can help me with this problem. Iwill say up front that I am not a SQL Server DBA, I am a developer. Ihave an application that sends about 25 simultaneous queries to a SQLServer 2000 Standard Edition SP4 running on Windows 2000 Server with2.5 GB of memory. About 11 of these queries are over views (all overthe same table) and these queries are all done from JDBC but I am notsure that matters. Anyway, initially I had no problem with thesequeries on the tables and the views with about 4 years of information(I don't know how many rows off hand). Then we changed the tables toreplicated tables from another server and that increased the amount ofdata to 15 years worth and also required a simple inner join on 2columns to another table for those views.Now here is the issue. After times of inactivity or other times duringthe day with enough time between my test query run I get what lookslike blocking behavior on the queries to the views (remember these allgo to the same tables). I run my 25 queries and the 11 view queriesall take about 120 seconds each to return (they all are withinmilliseconds of each other like they all sat there and then werereleased for processing at the same time). The rest of the queries arefine. Now if I turn around and immediately run the 25 queries again,they all come back in a few seconds which is the normal amount of time.Also, if I run a query on one of views first (just one) and then runthe 25 queries they all come back in a few seconds as well.This tells me that some caching must be involved since the times are sodifferent between identical queries but I would expect that one of thequeries would cache and thus take longer but the other 10 would befast, not all block for 2 minutes. What is more puzzling is that thisbehavior didn't occur before where now the only differences are:1) 3 times more data (but that shouldn't cause a difference from 3seconds to 120 and all tables have been through the index wizard with aSQL trace file to recommend indexes)2) There is now a join between 2 tables where there wasn't before3) The tables are replicated throughout the day.I would appreciate any insight into this problem as 120 seconds is waytoo long to wait. Thanks in Advance.Chris
View 1 Replies View RelatedSQL Server Express, Simultaneous ,Multiple Application Access?
Jul 27, 2006Hi Everyone,
I have a software solution that consists of two separate applications that share a SQL Server Express database on a single computer. Everything is working great, except when both of the applications want to access the database at the same time. All I can find is information on configuring multi-user access in a distributed system. I'd appreciate any information on configuring multi-application access on a single computer.
Thanks,
Mike
Store Procedure LOCK. How To Solve The Problem Of Simultaneous Call?
Mar 20, 2007Hello, I have one store procedure that writes something data to one physical sql table 'MyTable' and on beginning I first call:DELETE FROM MyTableProcedure returns at the end data from 'MyTable' as on SELECT. PROBLEM:I started SQL Manager on my Laptop and on Computer near me and all pointed to same database (on Server) and I run that procedure simultaneously on Laptop and Computer at the same time (two hands on F5 button on these computers). Occasionally when clicking with both hands at the same time I got no records at the end of execution (on both computers), otherwise I got the results.WHAT I THINK IS PROBLEM:Somhow one SP start working and it did not come to the end and another computer called this SP and execute first command (DELETE FROM MyTable) and I got empty records at the end..WHAT I NEED:I need to prevent this situation to get empty records. All computers must get these records always. How I can use some sort of LOCKs to do this?Or to do that on C# application level using LOCK command? Thanks in advanceAleksandar
View 2 Replies View RelatedReporting Services :: Adding (new) Child Domain Users To SSRS As System Users?
Jul 28, 2015We have an existing SSRS server, and have just created a new child domain. We'll be migrating users from the parent to the child, and want to add the users of that new domain with access to SSRS. In the parent domain they are able to access, but after migration with the child domain account, they cannot.
I have added the group CHILDDomain Users with a system user role on SSRS, and PARENTDomain Users was already there.
Is there any additional step I should/could take to get this active?
Why Out Of The Blue Would VPN Users Be Unable To Connect To Database And Local Users Are Unaffected?
Mar 6, 2008I have had this issue just pop up. I have local users who can connect fine, but my users that require connection by VPN cannot connect. I get the server not available or access denied error. I did confirm that the VPN'ers are connected to the network correctly and can see that their shares and mappings are correct. Any ideas? Thanking you all in advance!!
View 6 Replies View RelatedSQL Security :: Did Not Create Any New Users And There Are No Other Users Listed In Accounts Section
Sep 28, 2015I am trying to revert back to Windows 7 after upgrading to Windows 10, however it will not let me and the following message occurs: "Remove new accounts.Before you can go back to a previous version of Windows, you'll need to remove any user accounts you added after the most recent upgrade. The accounts need to be completely removed, including their profiles.You created one account (NT SERVICEMSSQLSERVER) Go to Settings> Accounts> Other users to remove these accounts and then try again".However I did not create any new users and there are no other users listed in the Accounts section.
View 2 Replies View RelatedStored Procedure To Get All Users Or All Users Of A Specific Country
Apr 30, 2008hi alli've got two tables called "webusers" (id, name, fk_country) and "countries" (id, name)
at the meantime, i've a search-page where i can fill a form to search users. in the dropdown to select the country i included an option which is called "all countries".
now the problem is: how can i make a stored procedure that makes a restriction to the fk_country depending on the submitted fk_country parameter?it should be something like
SELECT * FROM webusers(if @fk_country > 0, which is the value for "all countries"){ WHERE fk_country = @fk_country}
who has an idea how to solve this problem?