Impersonation Mode Issue: Multiple Analysts Requiring Separate AS DBs For Security Model
Nov 15, 2006
Hello--
We have a current situation where analysts will be modeling a variety of problems, all stemming from the same source data (stored in a SQL-Server 2005 relational database).
Analysts that work on the same problem will only have access to:
- A sandbox relational database (which contains views into the same source database). The analyst is db_owner of the sandbox database, so she/he can create data transformations required, etc. The sandbox database contains views to the source database, but the analyst only has read-access to the specific data elements needed from the source DB. So, they are very restricted w.r.t. the source database, but are db_owners of their sandbox relational databases. Note that the analyst will connect to the database via Windows Authentication.
- An Analysis Services sandbox database to use for their modeling, etc. In this AS sandbox db, we've created a role called "Administrator" and checked the permissions: Full control (Administrator), Process database, and Read definition. The analyst's windows account is the "user" associated with this role.
Also, in this situation, the SQL Server 2005 Relational Engine and Analysis Services are running on a single machine. The goal of this security model is to provide analysts with the ability to work in their "workspaces" (both SQL and AS), but not to see other analysts work, etc.
I'm running into a problem when trying to build models using this security model by doing the following:
- Running Visual Studio
- Selecting File -> Open -> Analysis Services Database and choosing the AS DB that I have access to (this is the only one that appears in the drop-down, after specifying the AS server).
- I've created a data source pointing to the relational sandbox DB.
- I've created a data source view choosing the table/view needed for the case table.
- I created a mining structure with a decision tree model
When I process the mining structure, I'm getting the following errors:
- If the data source Impersonation is "Default" -- the error is "The datasource, '<DS name>', contains an ImpersonationMode that is not supported for processing operations."
- If the data source Impersonation is "Use the credentials of the current user" -- the error is the same as "Default" above -- "The datasource, '<DS name>', contains an ImpersonationMode that is not supported for processing operations."
- If I change the data source Impersonation to "Use the service account" and select "OK" in the "Data Source Designer" window, and error comes up with message: "The ImpersonationInfo for '<DS name>' contains an ImpersonationMode that can only be used by a server administrator.
Any suggestions or pointers to help implement this security model to provide analysts with AS and SQL Relational resources for their modeling?
Thanks,
- Paul
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Jul 28, 2006
I want to Access External resources inside the CLR Code... But I am getting Security Exception
I have marked Assembly with External Access... here is the way I am doing..
I read articles and MSDN .. everywhere is written to use impersonation like
using (WindowsIdentity id = SqlContext.WindowsIdentity)
{
WindowsImpersonationContext c = id.Impersonate();
//perform operations with external resources and then undo
c.Undo();
}
In above case .. I tried both Windows Authentications and SQL Authentications ...
In case of Windows.. I am have a domain login to logon to my pc, while sql server is at another machine and Active directory is at different machine .. when connect to Database .. it says cannot find user Domainnameuser
and the SqlContext.WindowsIdentity is always null or it has exception User.Toked thew Security exception.
After that .. I tried to user custome Identity .. using IIdentity =GenericIdentity("UserName","Windows");
But there is now difference .. still same exception .. as given below..
[Microsoft.SqlServer.Server.SqlProcedure]
public static void MyProcedure()
{
Process[] p = Process.GetProcessesByName("YPager"); //Yahoo messanger exe .. a process
p[0].kill();
}
A .NET Framework error occurred during execution of user defined routine or aggregate 'MyProcedure': System.Security.SecurityException: Request failed.
System.Security.SecurityException:
at System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Assembly asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, SecurityAction action, Object demand, IPermission permThatFailed)
at System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Object assemblyOrString, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, SecurityAction action, Object demand, IPermission permThatFailed)
at System.Security.CodeAccessSecurityEngine.CheckSetHelper(PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandle rmh, Object assemblyOrString, SecurityAction action, Boolean throwException)
at System.Security.CodeAccessSecurityEngine.CheckSetHelper(CompressedStack cs, PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandle rmh, Assembly asm, SecurityAction action)
at DatFileGenerator.StoredProcedures.'MyProcedure'()
.
No rows affected.
(0 row(s) returned)
@RETURN_VALUE =
Finished running [dbo].['MyProcedure'].
How could I go ahead... what I should do to accompilsh the task...
Kindlly .. suggestions and ideas..
Thanks,
Muna
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Jul 31, 2007
Hi,
I have posted this issue for a week, haven't got any reply yet, I posted it again and desperately need your help.
The article http://msdn2.microsoft.com/en-us/library/ms365343.aspx says:
Model Item Security can be set for differnt security filters, but when I use SQL Server Management Studio to set Model Item Security, it seems "Permissions" property surpass "Model Item Security" property. -- My report server is using Custom Authentication.
For example, in "Permissions" property of the model, if I checked "Use these roles for each group or user account" without setting any user or group, no matter what users I added to "Model Item Security" with "Secure individual model items independently for this model" checked, NO one user can see the model on report manager and report builder;
in above situation, if I added "user1" and gave role such as "Browser" role to "user1" in "Permissions" property, if I checked "Secure individual model items independently for this model" in "Model Item Security" property, even I did NOT grant "user1" to root model and any entities under the model, the "user1" is able to access the model and all entities in report builder.
My question is on the same report model, how to set "AdminFilter" (empty security filter) for administrator permissions and set "GeneralFilter" (filtered on UserID) for general user based on their UserID?
The article also says:
"Security filters are always applied, even for users who have Content Manager or Administrator permissions to the model. To allow administrators or other users to see all rows of an entity on which row-level security is defined, you can create an empty security filter (which always returns True) and then use the filter to grant those users access to all the rows."
So I defined 2 filters "GeneralFilter" and "AdminFilter" for "Staff" entity for my report model "SSRSModel", I expect after I deployed the report model, the administrator users use report builder to build reports with all rows available, and the non-admin users can only see rows based on their UserID.
I can only get one result at a time but not both:
either the rows are filtered or not filtered at all, no matter how I set the "SecurityFilter" for the entity: I tried setting both "AdminFilter" and "GeneralFilter" for SecurityFilter at the same time, combination of "DefaultSecurityFilter" and "SecurityFilter", or one at a time.
Your help is highly appreciated!
Desperate developer
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Jun 27, 2015
I'm working on a Tabular model at my job since the users have a requirement to query against a live data source. I've been looking online for clients that issue DAX as opposed to MDX to the model, but besides SSRS and Power View, I could not find anything else. Any other client side interfaces to a DirectQuery Tabular model?
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Jul 20, 2005
Here is my issue. I have a list of merchants (generated daily) and Ineed to assign them eually to a set of analysts. Both the merchantlist and analyst list can change daily. I want to assign each merchantwith an analyst daily and need help to write out a stored procedurefor this (do not want to use VB).Here is relevant code for the tables:CREATE TABLE MerchList (MerchListID int IDENTITY (1, 1) NOT NULL ,FileDate datetime NOT NULL ,MerchID int NOT NULL ,AnalystID int NOT NULL ,)CREATE TABLE tblAnalyst (AnalystID int IDENTITY (1, 1) NOT NULL ,AnalystName varchar(100) NOT NULL)there will be about 10000 records in table MerchList and around 25records in table tblAnalyst.This will be used to assign work to analysts on a daily basis.Thanks for all your help!Vishal
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Jun 10, 2004
Hi all,
I need some sugestions from all of you about setting up security model in
our SQL2000 box.
The server was setup using Mixed mode. However, all the applications
(web and MS access) access the server using "sa" userid.
There are several databases in our server. Ex: (DB1,DB2,DB3,DB4 and DB5)
Application 1: need read/write access to DB1,DB2 and DB3
Application 2: need read/write access to DB5
Application 3: need read/write access to DB4 and DB3
Should I set up three userids and give them the dbo access to those
database that they need to use?
Does that make any sense to you?
Thank you for all your suggestion
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Oct 14, 2005
Hello there I have trying to figure out for days how to enable FullTrust for my Reporting Services security extension.
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Apr 15, 2008
I'm a bear with a very little brain. Please review the following story to see if I understand the concepts.
For the purposes of this exercise let's say that a database is used to control a building's HVAC (Heating, ventilation and cooling) system. It's installed by the HVAC vendor, who installs client software on the PC's in the building. This software allows the occupants of the building to alter the setting of the HVAC system. A young and foolish programmer/DBA - eager to show his mettle - accepts the responsibility of overseeing the system to make sure it works. What could go wrong? Easy money.
Given: A database that contains securable. (Tables, views, schema's etc).
By the second week, there is always someone complaining that it's too hot, too cold, too noisy (fans on too high). Everyone is setting their own settings. No one is happy - the only thing that they agree on is that the system doesn't work - and it's up to the less-young and less-foolish programmer/DBA to fix it.
Option #1: Create an Application Role (AIR_GOD) to control who can really write to the thermostat tables. This effectively blocks anyone who doesn't know the AIR_GOD password from fiddling. This password is only given to a carefully selected few.
Two weeks and fourteen passwords later:
Option #2: Create a fixed database role (AIR_GOD2) and drop only the selected few logins into it. (Our programmer is learning)
It helps. But since the users can access the whole thermostat-table - they end up setting each other's zones settings - sometimes by accident. Sometimes the values entered are insane.
Option #3: Create a Data Access Layer (DAL) Our programmer/DBA learns fast - he removes update rights to the thermostat-table from all users with a login. Now the only way to change a thermostat-table setting is through the stored-procedure(s) with the 'user without a login' impersonation. Values are checked before they're written etc.
Is that about right?
(Our story ends with the programmer/DBA growing older and wiser vowing never - ever - ever - to get involved with HVAC control systems again.)
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Feb 6, 2008
I have been playing with SRS 2005 for a few months now and have a decent setup going but am strugling with model security.
I have set my selected users up in the home folder and also as site users in site settings, they can launch the report builder and create reports fine.
HOWEVER
I intend to use the software accross multiple systems ie WMS, TMS, Finance package, T&A and therefore I only want the WMS users to see the WMS models and T&A users to only see the T&A models etc
No matter what settings are adjusted it seems that if you can launch the report builder then you can access all models and this poses an issue for me as systems like T&A and financials that I need to be as secure as possible.
I am aware that I can limit access to to models using Management studio but it seems to be basically on a column basis rather than the whole model.
Help!!!
Also aware of the fact im an idiot and basically posted the same thing 5 or 6 times! Hopefully the others are deleted
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Dec 11, 2007
Hi,
I am receiving the following error when I run the report builder query. I am able to successfully select the dimensions and measures that I am intrested in but when I run the report I get the error message.
The 'PerspectiveID' custom property for the 'query' perspective is either not set or is not set to the string data type.
----------------------------
Semantic query execution failed.
----------------------------
Query execution failed for data set 'dataSet'.
----------------------------
An error has occurred during report processing.
I am testing this against both Adventureworks standard and enterprise cubes. Additionality I saw a post in this forum
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=368962&SiteID=1
that seemed related but I am using reporting services in sharepoint integrated mode so I am having a hard time trying to troubleshoot this.
Thanks,
Larry
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Dec 30, 1999
Is is possible to upgrade from 6.5 to 7.0 and have all the logins that have been granted the ability to make a trusted connection to 6.5 be created the same capability in 7.0?
When I did it the logins were created as standard logins in 7.0
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Jan 4, 2008
Hi
I just deploy a report model and want use report builder to create ad-hoc using this report model.
I want some entitis and attributes are not visiable for some user, so I config the model item security for this model.
But no matter which user I use to login the report server, I always can access all the entities.
Even I delete all the groups and users in "Permissions" property of the model, I still can access this model through report builder.
All the user I used to test are local user of server with report service, my server is SQL Server 2005+SP2.
How can I fix it?
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Sep 11, 2006
Hello,
I have created one application in visual studio 2005 and also created setup project of that application. now i want to install SQL Server Express edition with my application. so i have checked SQL Server Express 2005 in Setup Project Properities(Prerequisites...). now i want to change SQL Secirty Mode during setup. and i don't know how can we do this?
Any idia?
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Sep 21, 2007
I have a question on the security model for MSRS 2005. I have been working with the permissions for the reporting server folders and reports at my company. Now it seems to me that I can let a user have access to a folder but they will not be able to see any reports that they do not have permissions to see. This would seem different from the Windows Security model where I can see an executable but not actually execute it. (ie. In MSRS the user would be able to see the report but not execute it)
Am I correct in this assumption or is there a way to allow the user to see the report but not execute it using the MSRS permissions.
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Apr 25, 2007
Hi,
I am trying to use a very easy and simple feature of a reportmodel, model item security.
In my example i have two users; HGHJohn and HGHJKooi
I want to test if I am able to restrict access in the model to a whole entity. HGHJKooi shouldn't be able to see the entity 'Customers'.
These are the steps I executed:
1. In Sqlserver management studio I opened the properties of my model and navigated to the tabpage 'model item security'.
2. I activated the option 'secure individual model items...'
3. In the root of the model I declared two users(groups) as specified above
4. Automatically all nodes inherit these settings from the root.
5. For the entity 'Relations' I change the default, by selecting 'use these roles for each group or user account'
6. I removed HGHJKooi from this list, leaving only 'HGHJohn as model item browser
What I expected at this moment is that when I login the system as HGHJKooi, then I won't see this entity, but I still can! Does anybody know a solution to this problem?
Julian Kooiker
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Feb 8, 2007
Hi all
I have created security roles that restrict access to a certain Dimension
and a member therein.
The security works fine when the users finened in it runs a report:
The data is accordingley ristricted.
The problem is when those same users run Report Builder and create a report,
those members are no longer restricted and they have acces to absoluteley
all data from the cubes.
Is there some way that I can force the Data Model to follow the cube's security roles?
Any help is much appreciated...
Gerhard Davids
EDIT:
I have found that it uses the wrong user when opening report builder.
For some reason it uses my windows account instead of the one I used to log onto
report manager. This is way the security isnt working
Any thoughts what may be causing this?
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Apr 27, 1999
We installed SQL7 over the weekend. Everything was working peachy through yesterday. This morning SQL server is requiring all of the queries to require references to the username in the from clause...
For example
"Select * from mytable" used to work fine. Not it requires "select * from username.mytable"
I'm logged in as the same username, which is the DB Owner as well. Any idea why this is happening all the sudden?
TIA
Kevin
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Jan 4, 2007
Hello--
We're running into an issue where analysts are having problems obtaining lift charts (via the Mining Accuracy Chart UI available in the Visual Studio Analysis Services project) and performing prediction (via the Mining Model Prediction UI).
The issue seems to be related to the underlying analyst security model. Note that this post is related to:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=924641&SiteID=1
Analysts that work on the same problem will only have access to:
- A sandbox relational database (which contains views into the same source database). The analyst is db_owner of the sandbox database, so she/he can create data transformations required, etc. The sandbox database contains views to the source database, but the analyst only has read-access to the specific data elements needed from the source DB. So, they are very restricted w.r.t. the source database, but are db_owners of their sandbox relational databases. Note that the analyst will connect to he database via Windows Authentication.
- An Analysis Services sandbox database to use for their modeling, etc. In this AS sandbox db, we've created a role called "Administrator" and checked the permissions: Full control (Administrator), Process database, and Read definition. The analyst's windows account is the "user" associated with this role.
Also, in this situation, the SQL Server 2005 Relational Engine and Analysis Services are running on a single machine. The goal of this security model is to provide analysts with the ability to work in their "workspaces" (both SQL and AS), but not to see other analysts work, etc.
Under this model, Analysts are able to deploy mining models when the Data Source object that points to their relational "sandbox" DB is set-up with "Impersonation Information" = "Use a specific user name and password", where the Analyst provides their domain account information.
But, when trying to build a lift chart using the same data source view objects that were used to successfully train the model, the following error is occurring consistently:
Window Title: "Loading Mining Accuracy Chart"
Window Text: "Failed to execute the query due to the following error: Execution of the managed stored rocedure GenerateLiftTableUsingDatasource failed with the following error: Exception has been thrown by the target of invocation. Either '<domain><login>' user does not have permission to access the '' object, or the object does not exist. Errors in the high-level relational engine. A connection could not be made to the data source specified in the query. Errors in the high-level relational engine. A connection could not be made to the data source specified in the query.."
Since the Analyst was able to build the model with her/his given '<domain><login>' credentials, it is puzzling why the lift chart is failing.
Thanks in advance for your help,
- Paul
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Aug 7, 2006
Hi,
I have a question here for report model generated on top of SSAS 2005. If security has been defined in SSAS 2005 cube where RoleA only have access to certain dimension, is this security setting integrated with the report model and propogate down to the report builder when used where RoleA users have no access to dimension allowed?
Thanks,
J Lim
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Sep 7, 2005
Hi,
We are building an application for online system for people to place ADs for selling various used items like Car, Electronics, Houses, Books etc.
If someone selling a car then he can fill out headline, year, make, model, mileage, transmission, condition, color, price, description, contact etc.
Similarly if someone selling a digital camera he will fillout headline, memory, zoom, megapixel, maker, model, color, batter, description etc.
Option 1: I can have a main table to hold the common attributes of all different types of ADs (headline, images, contact, price, color, condition, description)
+ 1 table to store string values of all ADs (car: maker, model, square feet (if house), memory, megapixel (camera) etc)
+ 1 table to store the droplist select values(car: transmission, door, seat etc; house: year_built)
pros: single table for all ADs. unique IDs for all ADs, easy to extend as new attributes can be dropped easily.
cons: lot of physical reads of 2nd and 3rd table from join. 10 times physical reads compared to option 2 when reading 5000 records.
Option 2: have different set of table for each AD type. Car will have its own main table + 1 table to store multiselect list box values.
Similarly housing will have its own set of tables
pros: 10% less physical read than option 1.
cons: hard to add new attributes. We have to modify the main table by adding one column.
Query will go to different table based on the category.
Do you have any suggestions on which way to go?Thanks
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Sep 25, 2004
Hi, I'm having a rough weekend and really need some advice. We've been having some problems with our SQL Server ever since an upgrade to SQL 2K and then were moved by the IT security people to a new domain that is not in a trust relationship with the domain the SQL Server is on. After the move, attempts to log into a CMMS application we use, called Maximo, are failing. The error indicated that the user's domain login isn't trusted with the SQL Server. This is odd, because we use SQL Server Authentication and each user has a different username on the SQL Server and shouldn't care about the domain login, so I don't know why it's even being passed. This application has been working fine on SQL Server 7 for the past 3 years.
Our SQL Server is setup for Mixed Mode (set during installation and verified in Ent Mgr) and the clients are using ODBC to connect with TCP/IP port 1433 (setup with the client configuration in the ODBC properties) using SQL Server Authentication. The problem is that the settings seem to be ignored and it's using Windows Authentication only, which is a major problem. All of the grants are given to the SQL Server user by the Maximo application and all records are tracked by the login, so we can't use Windows Authentication. I am able to add the user's domain login to SQL Server and give it RW rights to the database and the user is able to login, however unable to run reports because the grants are given to the SQL Server login, not the domain login.
I tried removing the server from the domain it was on and making it a stand alone server, which resulted in the following error:
Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection.
This is telling me that it's ignoring SQL Server Authentication. I've also tried installing Patch 3a on SQL Server and installing MDAC 2.8 on the client.
Please help, I need to get it running by Monday.
Thanks
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Jan 30, 2008
Hi,
I would like to demonstrate mining temporary models in an ASP.NET application.
Creating, trainning, predicating actions are all witten at C# codes as follows:
Code Snippet
using (AdomdCommand cmd = new AdomdCommand())
{
// Build temporary mining model
cmd.Connection = asConn;
cmd.CommandText = "CREATE SESSION MINING MODEL " + modelName +
" (" +
"HCVS_MemberId Text KEY," +
"HCVS_MeasureDate DATE KEY TIME, " +
"SysPressure LONG CONTINUOUS PREDICT, " +
"DiaPressure LONG CONTINUOUS PREDICT," +
"Pluse LONG CONTINUOUS PREDICT" +
") " +
"USING Microsoft_Time_Series(Missing_Value_Substitution='Mean' ) "; // Periodicity_Hint = '{12}'
cmd.ExecuteNonQuery();
// Train Data
cmd.CommandText = "INSERT INTO " + modelName + " (HCVS_MemberId, HCVS_MeasureDate, SysPressure, DiaPressure, Pluse) " +
"OPENQUERY([Healthcare], " +
" 'SELECT HCVS_MemberId, HCVS_MeasureDate, SysPressure,DiaPressure,Pluse" +
" FROM v_VitalSignForecast WHERE HCVS_MemberId=''" + id + "'' AND HCVS_MeasureDate>=''" + from.ToShortDateString() + "'' AND HCVS_MeasureDate<=''" + to.ToShortDateString() +"'' ')";
cmd.ExecuteNonQuery();
// Predict upon the Train Data. In addition, the standard deviation of each predicated value is retrieved
cmd.CommandText = "SELECT FLATTENED " +
"( SELECT *, " +
" SysPressure + PredictStdev(SysPressure) AS [SysPressure_PlusStdev], " +
" SysPressure - PredictStdev(SysPressure) AS [SysPressure_MinusStdev] " +
"FROM PredictTimeSeries(SysPressure, " + fDays + ") AS SysTable " +
") " +
"FROM " + modelName ;
AdomdDataAdapter adapter = new AdomdDataAdapter(cmd);
DataSet sysDS = new DataSet();
adapter.Fill(sysDS);
The problem is that I do not know how to configure my Analysis Service Server to let ASP.NET account can utilize it. And ASP.NET account in trun impersonates the account who is authorized to use Healthcare DB in the Openquery. Please give a help. Thanks a lot.
Ricky.
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Feb 7, 2008
I have a restriced user on SQL Server that is only permitted to creat a new database and manage it only. All other database are hidden to that user.
when that user login to SQL Server and create a database and try to change the default folder path for data and log files, gets an error,
The Server principal "User" is not able to access the database "model" under the current security context. (MSSQL Server, Error: 916)
Any idea???
Thanks,
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Jan 16, 2008
We just upgraded from SQL 2000 to 2005. Under 2000, I could export multiple stored procs to separate windows files.
Is there a way to do this under 2005 without exporting 1 proc at a time?
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Feb 13, 2008
I've been through a number of tutorials on how to enable row-level security based on a userID, but my problem is more complicated and I do not have sufficient understanding of report models to guess.
My security information is defined in a table within my database. It contains a username and an account mask. An account mask maps to 1 or more account codes contained in the other data tables in my report model. A user may have more than one account mask defined for his account.
I understand the concept of directly mapping the logged-in user to a field containing a matching username. Is it possible to do a two-step mapping, so that based on the user ID I can get the account mask(s) and then evaluate which account codes match the mask(s)?
Or is there a different/better way to set this up? Defining SQL roles/groups is not an option, because of some compatibility issues with external systems.
So far, because my security table has no defined relationship with the data tables, I have not even been able to get it into my report model (Would love any suggestions on that one, too.)
I'd appreciate any ideas or suggestions - even if only something to investigate.
Thanks,
Sarah
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Feb 21, 2006
I am working on the security model for an application that will be used by 100s of users with a dedicated SQL 2005 database for this application and access via SQL XML Web Services.
The client has asked to make it "open" during alpha testing such that anyone can access the web services without having to set them up first. Is there a way to do this? The best I can figure is to use mixed mode security and hard code a login and password. Any method using Windows authentication would require that I add every user at a minimum to the database.
In production, all users will have an active directory role specified that determines if they should have access to the web services or not. However, it is my understanding that to use Windows authentication, I would still need to add each individual user at a minimum as a Login to the SQL Server, and under best practices also as database users with permissions granted to the endpoint.
Am I correct in the above, or is there a more efficient way to achieve these results?
Thanks
-L
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May 15, 2015
We have multiple databases on a single instance in an OLTP environment. I have my data files on a separate SAN LUN from my transaction log files (and a few NDFs split out onto additional LUNs). I was wondering if there is a performance benefit to putting each LDF file on its own LUN? Or at least my few busiest LDFs?
We are currently on 2012, but I'm having to put together specs for a 2014 installation and need to answer this question without having an environment in which I can benchmark different setups. I just want to hear whether or not others have done this (why or why not?).
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Jul 10, 2006
Hi There,
Can anybody suggest me what is the best way to take a column with comma separated stings and output them into multiple columns with strings?
for example if I have a column with "watertown, newton" as a string, I need to separate them to two columns with watertown and newton values?
Is Derived column transformation the best way to do it?
Thanks.
Sam.
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Mar 17, 2014
I am testing out a blank database created over two physical files on two separate disks with one table called data which has one column called values nvarchar(max).
I filled the table up with a whole load of data and ran a select * against it. If I run Permon at the same time I can see that the read load has been spread over multiple disks as each of these disks is getting read from in parallel. If I create the same database on a single file and run the same select * again it takes much longer, proving that the read load has been distributed across multiple disks.
Now moving onto writes, this is where the confusion lies. I understand that SQL server fills files evenly until they need growing, after which it will then fill files individually until they are full in a round robin fashion unless you have trace 1117 turned on. What I don't understand is why the writes aren't distributed out whilst it is filling these file groups.
I ran an continual insert into my table with go 1000000 to monitor how the files are being filled up. I monitored where SQL server was physically placing the files as they were being inserted by running the following query:
;WITH CTE AS
(SELECT
sys.fn_PhysLocFormatter (%%physloc%%) col1,
RIGHT(LEFT(sys.fn_PhysLocFormatter (%%physloc%%),2),1) AS [Physical RID],
DATAID
[Code] ....
I could see that it would a thousand or so records into file 1, then a thousand or so into file 2, then a thousand or so into file 1 etc etc. In another words it would hit one disk, then another disk, then back to disk one to fill the file evenly. Is there any way to make SQL Server distribute the writes out in parallel so that both disks are writing in tandem?
By the looks of it, multiple disks only scale reads, as with writes only one disk is ever written to at once which is annoying. Any way to harness the write power of multiple disks?
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Running 2005 Beta 3 Refresh. When I first deploy, it works fine. Subsequent deployments yield the following error:
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Does anyone have a sample of what a database would look like that would support multiple clients in a single ASP.net application?
Thank you,
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Hi Experts,
I have a analysis service cube conaining 4 dimensions. Is it posible to create a report using Report Model(which I already created) through Report manager? I'm currently using SSRS 2005. Please let me know the procedure?
Thanks & Regards,
Naveen J V
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I am trying to add 2 separate columns from separate tables i.e column1 should be added to column 2 when inserted and I want to use a trigger but i don't know the syntax to use...
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