How Do I Scale A Database To Handle A Billion Simultaneous Users?
Mar 30, 2007
Hi 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.
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Mar 29, 2000
How can I simulate 1,000 simultaneous users in my database?
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Aug 14, 2007
Greetings!
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
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Mar 30, 2001
Hi,
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.
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Feb 13, 2008
We have a problem authenticating domain users contained in local machine user groups across multiple web servers in a scale out deployment.
When we originally setup our single SSRS database server we were told the a best practice is to add domain users to local user groups on the SSRS machine.
Now we want to add more web servers and create a scale-out deployment. So, we added the web servers and configured the scale-out deployment. But, only administrators can see the reports since all of our SSRS roles are assigned permissions such as "Machine1User_Group".
We were told that we have to create identical local groups on Machine2 and Machine3 and then add them to the SSRS roles. This is prohibitive since it would mean managing 3 identical user groups containing thousands of domain users.
Is there a better way to do this without using Domain User Groups?
Thank you for any assistance.
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Feb 4, 2008
Hello friends
I am new to SQL database design.I am having a table name customerletter_master in which all details of customer letters are saved.At a time i.e in single second around 200- 400 entry are made in customerletter_master table. Hits to customerletter_master table are more.
Following fields are used in customerletter_master – CID (autogen number), letterno(primary key),consignee, consignor, letterstatus1, letterstatus2, letterstatus3, POD, and some more fields. When letter passes to different stages letterstatus1 is filled to yes and then letterstatus2 and letterstatus3 are filled according to passage of letter.
And at same time many user can accesses the customerletter_master table to search any letter according to letterno. Therefore customerletter_master is used to enter data and to search data at same time and there can be more than 200-400 users doing add and search records to and from customerletter_master
how should i design this table. What should i use to enter and search record and minimize the table hits made by the user at same time. Should i use store procedures or any other method to add and search record. Plz help me out by giving some example.
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May 3, 2008
basically, is it inefficient to open and close a data connection everytime data needs to be retrieved or is there a way for a user to use the same conenction over multiple pages orfor multiple users to share one global data connection I just wanted to know this before I built a site where data could be constantly being pulled or put into the database.It would be easier to just keep opening and closing the connection since it just means pasting in the small chunk of code I use to do that where I need it. I hear speak of connections sometimes not closing etc and wonder if that is an issue then if you are opening and closing too many of them. I am using SqlConnection SqlCommand and SqlDatareader , my code works, just wondering if my approach lacked scalability before I find out too late and have to rewrite everything . Jim
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Mar 6, 2008
I 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!!
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Nov 28, 2006
Hi Team,
In SQL Enterprise Manager, when we expand "Database -->Users", we see the
users there. When we expand "Security --> logins" we see the same users there.
Can you differentiate these two.
Thanks
Santhosh
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Apr 22, 2008
Morning forum,
I'm having a problem to which I'm sure the answer is simple...
All I want is a list of databases on my server with their allocated size and the free space within. Something similar to the first table that sp_spaceused gives you but on a server wide scale.
As I say, I'm sure there's a simple solution out there, but alas Google has failed me.
Thanks in advance,
Dan.
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Mar 20, 2008
HELP. I've inherited some less-than-stellar dessign.
I have a table:
tbMD
ObjectID uniqueidentifier not null
Tag nvarchar(50) not null
Data nvarchar(400) not null
This table has 1.6Billion records and has filled up the drive (nearlly 1 TB in the DB, with about 600GB in this one table).
I need to move this table to another drive with ZERO down time.
I have created a new filegroup on a second drive array and created a new table (tbMD_TEMP) and my thought was to copy all the data from tbMD into tbMD_Temp then drop tbMD, and rename tbMD_Temp.
So, anyone have any great ideas on how to get this done very quickly?
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Jul 30, 2007
Hi;
I want to know, if a table has 1 billion recoreds then it will work eaisly with .net objects like datasets etc?
if not, what is the normal amount of data for sql server which is easy to manage for system.
Adnan
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Mar 28, 2008
I will be receiving data from a company called Loan Performance, that has one file/table that will hold 1 billion rows. They send data by period, and I plan to load the data via BCP via NT/DOS scripts. The 1 billion rows represents data for 200+ periods.Are the following design plans feasible1. Partition table by period value, I'm not sure of the max number of partitions per table in 2005, but I think we have periods data back to 1992 and a new one gets created every month, so the possibility of having > 1000 partitions exists. I plan on just pre-creating partitions for future data, instead of dynamically creating when a new period is sent.2. Load data via BCP in DOS shell scripts that will drop index (by partition), BCP in data, and they re-create indexes by partition, is this possible ? and will I see a performance increase as opposed to one huge table (I'm pretty much sure I will). There is usually one periods data present per day, but sometimes the vendor resends all data (would get loaded on weekend).I'm a bit unsure of where to start being I never worked with this amount of data. I worked with partitioning in Oracle a long time ago.I plan on having an 2XQuadCore 2.66Ghz CPU with 32GB of RAM and SQL2005EE 64Bit connected to 1 Terabyte SAN Disk.Thanks all,PMA
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Apr 29, 2015
I have assignment to do inplace upgrade from sql 2012 to 2014.for user database either i can restore or attach and change compatbility level. How to handled system database, my main concern is exiting job, if i restore sql 2012 msdb database, will this bring all existing jobs or do i need to script jobs before uninstall? also need to know, how to handle replication. The server, i am going to upgrade is replicating data to different server and also act as subscriber ,
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Aug 19, 1999
After moving our database between servers, one table had a hiccup in it's
identity column. The number jumped from 761 to 1886863475 on the next
insert. This is a production server and I didn't catch it until yesterday.
So I have several days worth of numbers in a central table. I can't clean
them out, but I wondered if I could do the following:
DBCC CHECKIDENT ('table_name', RESEED, 800)
I tested it on our development server and it doesn't seem to cause any
problems. I know that when we get to 1.8 billion on the identity column
again we'll get an error, but I'm willing to risk it.
A few questions. 1) Am I insane for trying this? 2) Has anyone else ran into
a similar problem and what did you do to fix it? 3) If I do this, is there
anything in particular to watch out for? 4) What caused the jump in the
first place?
My other option is to change the datatype from int to decimal(19) or
something along those lines. This will upset our programmers and I'll have
to change all my foreign keys (not a big deal, just a pain).
Any input at all here would be appreciated.
Thanks,
Grant
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May 27, 2006
Hi everyone,
Kindly tell me the size of database that SQL Express can handle.
Tks for your cooperation.
Brgds,
Adien
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Jan 31, 2008
hi,
I want to Display the image records of each employee of having 10 images of each.the number of records are more then one billion.......
please provid me the optimized query that can i used in SP and display in Gridview.
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Feb 29, 2012
So I just got an email from Production Support saying an hour and a half downtime is unacceptable to move a half billion rows between 2 partitions because I am moving a clustered index and space is a consideration.
I can not use partition switching because the clustered index is changing.
This is what I am doing...
1. I am creating a new table with the new cluster on a new partiton
2. I am moving the records in 5K set based batches by doing a range search on the existing clustered index on the existing table.
3. I then reapply all of the nonclustered index from the original table to the new one.
4. I do a sp_rename swap out.
The same way I have done this many times before. Is there some new secret special sauce (other than partition switching) I can use?
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Aug 5, 2014
It was an interview question, what's the best way to update a table with 10 billion rows.
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Dec 12, 2007
I have a asp.net 2.0 web application. In one of the modules I have following scenario. In the UI there are 3 pages to take the input from the user. On the 1st page, we are inserting data in the master table and with the same we are beginning new sql transaction with the isolation level READ UNCOMMITTED. so that uncommited master table data can be read. Master table has also has 4 detail tables. Then the user is navigated to 2nd and then to 3rd page where the user can enter multiple records in the detail tables. And only after finishing on the 3rd page, the transaction is commited.
I want to ask that is it the right way of doing this kind of functionality?
And is there any other way of doing this?
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May 2, 2006
If 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
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Mar 12, 2006
I 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?
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Dec 3, 2007
Hi
I'm using service broker and keep getting errors in the log even though everythig is working as expected
SQL Server 2005
Two databases
Two end points - 1 in each database
Two stored procedures:
SP1 is activated when a message enters the sending queue. it insert a new row in a table
SP2 is activated when a response is sent from the receiving queue. it cleans up the sending queue.
I have a table with an update trigger
In that trigger, if the updted row meets a certain condition a dialogue is created and a message is sent to the sending queue.
I know that SP1 and SP2 are behaving properly because i get the expected result.
Sp1 is inserteding the expected data in the table
SP2 is cleaning up the sending queue.
In the Sql Server log however i'm getting errors on both of the stored procs.
error #1
The activated proc <SP 1 Name> running on queue Applications.dbo.ffreceiverQueue output the following: 'The conversation handle is missing. Specify a conversation handle.'
error #2
The activated proc <SP 2 Name> running on queue ADAPT_APP.dbo.ffsenderQueue output the following: 'The conversation handle is missing. Specify a conversation handle.'
I would appreceiate anybody's help into why i'm getting this. have i set up the stored procs in correctly?
i can provide code of the stored procs if that helps.
thanks.
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Mar 22, 1999
Is there a limit to the # of tasks ( Dumps) to a HD device ,which SQL 6.5 can perform simultaneously?
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Oct 22, 2007
Hi,
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
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Feb 14, 2008
Hi 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.
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Jul 11, 2006
Using 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.
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May 7, 1999
Anybody figure a way around this:
In a development server you take a backup and you want to move the entire database to a production server. The production server does not contain the database, users, or logins in master.
When you restore the backup to production in 7.0, the users get moved to DBO because the logins do not exist and then you cannot delete them.
We are having to drop the users from the database on development, back up the database and restore it to production, then recreate the users on production.
This is bogus and did not happen in 6.5 because of the aliases.
Anybody come up with a better way?
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Apr 7, 2008
Hi, 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?
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Jul 20, 2005
hello 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
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Oct 15, 2007
Is 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.
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Oct 23, 2007
How 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.
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May 21, 2008
hi there,
After replicating a database, the stored procedures in that same database are not able to edit by other users than service account (sys admin users), When the normal users try to edit any of the stored procedures, sql server 2005 is throwing the following error...
Msg 21050, Level 16, State 1, Procedure sp_MSmerge_ddldispatcher, Line 12Only members of the sysadmin fixed server role or db_owner fixed database role can perform this operation. Contact an administrator with sufficient permissions to perform this operation.
any suggessions are most welcome.
by
CHINNASAMY
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