Heavy Locks on the Entity Framework Database

Dears,
We are having a database which was developed using a Entity Framework, the web application was built on the top of Windows Work Flow Engine (WWF) and there are some stored procedures given below, which was generated by WWF. On which there are numerous heavy
locks are happening and we are not aware of how fix this issue.
[System.Activities.DurableInstancing].[RecoverInstanceLocks]
[System.Activities.DurableInstancing].[ExtendLock]
Any solution to above problem or if you know the source of the problem, it would be much helpful for us

Dear pituach,
First i would like thank you for your replies, hope we could reach some concrete solution which may more people.
To
start doing something on the below procedures, first we need to know what was purpose of this procedures, this procedures are accessing some of the below listed tables. I think it was some standard behavior of Entity Framework System. The below tables and
some of procedures are injected into the database with a purpose, i would like to know what was it.
[System.Activities.DurableInstancing].[DefinitionIdentityTable]
[System.Activities.DurableInstancing].[IdentityOwnerTable]
[System.Activities.DurableInstancing].[InstanceMetadataChangesTable]
[System.Activities.DurableInstancing].[InstancePromotedPropertiesTable]
[System.Activities.DurableInstancing].[InstancesTable]
[System.Activities.DurableInstancing].[KeysTable]
[System.Activities.DurableInstancing].[LockOwnersTable]
[System.Activities.DurableInstancing].[RunnableInstancesTable]
[System.Activities.DurableInstancing].[RunnableInstancesTable]
[System.Activities.DurableInstancing].[ServiceDeploymentsTable]
[System.Activities.DurableInstancing].[SqlWorkflowInstanceStoreVersionTable]
Working as a Senior Database Analyst & Architect at Ministry of Higher Education in KSA

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Custom mapping is obviously not reflected in the Entity Framework designer

Hi,
I use the Oracle Data Provider for .NET 11.2.0.2.50 Beta 3 with the Entity Framework. I added a custom mapping to the app.config that maps NUMBER(1,0) to bool:
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"Schema specified is not valid. Errors:
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Okay. Assuming it's an error in the EF designer, I set the type Boolean in the model myself for the NUMBER(1,0) fields. But that gives me a compilation error:
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Is this a bug in the provider? Or am I missing something?

Are you using model first or database first? If you're using database first, make sure you update the model from the database after adding that configuration.
Also, if your model is in a different assembly (ie a different project) from your executable, your executable project's configuration file also needs the mapping section.
Finally... there's been a LOT of threads about this not working properly in beta 3. I'm still on beta 2 and except for some incorrect error messages in the designer it works fine (I get fake errors). If nothing else works, I might suggest trying beta 2 as a last resort.

Microsoft open sourced the Entity Framework

http://weblogs.asp.net/scottgu/archive/2012/07/19/entity-framework-and-open-source.aspx
Microsoft wants others to get involved in building the next version of the Entity Framework.
The source code is found here:
http://entityframework.codeplex.com/
The Mono Project is working to get the open sourced Entity Framework to work on Mono.
So, with Oracle working on a thin ODP.NET provider, hopefully, it will work on Mono too. But no guarantee from Oracle. I know at first, the thin ODP.NET provider will not support Entity Framework, but down the road it could (hopefully).

I'm using NHibernate and I'm more satisfied with it than EF.
Alex said that the final release for managed provider will come with Oracle 12 which maybe will come at the end of the year.

Want to use the Entity Framework for Oracle

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In short, what do I need to do in order to upgrade to the version of Oracle that will support the Entity Framework while still supporting legacy apps? Do I go for an Oracle Client upgrade or I just merely get the latest version of ODAC/ODP.NET installed on that server?
Thanks!
Edited by: imterpsfan2 on Mar 7, 2013 12:01 PM

imterpsfan2 wrote:
What I would probably like to do is somehow set the dll directory to my local bin directory and just put all the .dlls for the most recent ODP.NET in my app and leave the existing applications as they are until I can migrate them.
I've seen examples of this but doesn't seem to work for me.You can do that by having both Oracle clients installed, and using the DLLPath configuration option to force the applications to use the one you want.
That said, the next version of the managed client is going to support working in Entity Framework, and that is just an assembly you can include in the project with no Oracle installation at all. So really, the best answer is going to be to use that once they release it.
(Also - most of the time something compiled for Oracle 11.x will work in 11.2.0.3 without doing anything. The 11.2.0.3 installer adds binding redirects to itself from older versions, provided you were loading from the GAC.)

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I tried a simple way given below. please some one help me that where and what I missing the.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using EmployeesLib;
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below is the Connection String in the App.config file both in the project.
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security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />

humm, I falling the ball to the batsman(sqlserver) but it getting "NOBALL" in response(not saving). Ok it my be problem in visual studio I am struggling to remove my operating System, VS2013 and sql server, by reinstalling it might works.
because i havent any other computer where these application are installed for the test.
If you create and send me a small project that contain minimum of two columns of table( in sql server ) which can saving new data from datagrid so i will thankfull of you.
it is just for confirmation that either the problem is in OS or VS.
I doubt that any of it has anything to do with the issue. If you think it does, then you can post to the forums.
https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?forum=vssetup
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/home?category=sqlserver
I think you are riding a bad horse (that tutorial) you are using, and you need to change horses. I think the 'modified' state is not being rasied on the entity bound to the grid when it has changed, and EF is not going save any entity that's not in a modified
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hi Michael,
Thanks for you posting!
Sorry for I am not totally understanding your issue. Maybe two points need your confirm:
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Thanks & Regards,
Will
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Hello !
I'm using VB.net , EF6 with SQL server 2008R2 database.
This is the situation :
I have created the application. Using wizard I have created the Entity model from an existing database.
A client start using this application using this database on his computer.
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Now I have a new .exe file that has the new model from the new database.
I put the new .exe file on the client computer.
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Thank you !

Hello,
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video,
and with the
Entity Framework Power Tools, it is easy to create a code first based project form an existing database.
Regards.
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How to create ViewModel in an MVVM application using entity framework where database has many-to-many relationship?

I have started developing a small application in WPF. Since I am completely new to it, to start with I took a microsoft's sample available at
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3 Table Case (caseId, CaseNo)
4. Link Table Petitioner (CaseId, PartyId)
5. Link Table Respondent (CaseId, PartyId)
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using VB.net. So please provide solution in vb.net.
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Hi ArunKhatri,
I would suggest you referring to Magnus's article, it provides an example of how you could display and let the user edit many-to-many relational data from the Entity Framework in a dynamic and data-bound DataGrid control in WPF:
http://social.technet.microsoft.com/wiki/contents/articles/20719.wpf-displaying-and-editing-many-to-many-relational-data-in-a-datagrid.aspx
You can learn how to design the ViewModel and the relationship between the entities.
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Deploying LightSwitch applications to IIS using the Oracle Entity Framework

I have had no sucess running Lightswitch applications on IIS using the Oracle Beta entity framework. Applications work fine from visual studio but after deployment fail when I trying to access an Oracle data entity.
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Thanks in advance
Edited by: user12218662 on 08-Oct-2011 11:35
Edited by: user12218662 on 08-Oct-2011 11:37

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I have my desktop application that use EF6. So the connection failed when I use the proxy.
Also for skype or browsers but I just config the proxy on setting and there will work fine.
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Hello,
>> So how to configure the proxy for EF6 to add proxy setting to my application ?
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Regards.
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Problem Entity framework and short types

I am using the Entity Framework in Visual Studio to access a table in my oracle database. Problem is when selecting a record in runtime the following error shows up:
Value was either too large or too small for an Int16
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thanks.

Yes, you need to change the mapping for that type to an int32. To do that you can add this to your configuration file:
<oracle.dataaccess.client>
<settings>
<add name="int16" value="edmmapping number(4,0)" />
<add name="int32" value="edmmapping number(9,0)" />
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not sure which forum is best, so im going to throw it in here.
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MonitoringData.cs
[BasicHttpBindingServiceMetadataExchangeEndpoint]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
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// This method is called only once to initialize service-wide policies.
public static void InitializeService(DataServiceConfiguration config)
// TODO: set rules to indicate which entity sets and service operations are visible, updatable, etc.
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config.SetServiceOperationAccessRule("*", ServiceOperationRights.All);
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V3;
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upon deployment, this error when hitting the https://server/_vti_bin/poc/monitoringdata.svc/$metadata
"The type 'xxxxxxxx', provided as the Service attribute value in the ServiceHost directive, or provided in the configuration element system.serviceModel/serviceHostingEnvironment/serviceActivations could
not be found."
Breaking out the google-fu, i found that adding the dll to the <compilation> section was needed for the web.config. so i did that. and now i just get a blank screen with no errors.
so i crack open fiddler. i see the following
200 http
tunnel to
server:443 0
401 https
server /_vti_bin/poc/monitoringdata.svc/$metadata
16
401
https server
/_vti_bin/poc/monitoringdata.svc/$metadata
0
404
https server
/_vti_bin/poc/monitoringdata.svc/$metadata
0
best i can see is that im either not authorized, and its returning null (which shouldnt be the case) or something is just busted.
The goal is to use ntml auth and https to connect to this service. any ideas?

One thing I found was that it's never worth the trouble to place the WCF service in a web site running SharePoint, it's better to place it in a dedicated web site, as described in this article:
http://sharepointdragons.com/2011/10/07/parallel-programming-in-sharepoint-2010-the-back-to-the-future-pattern/
It's usually too much work to get the web.config settings right because of the settings it inherits from its parents.
Kind regards,
Margriet Bruggeman
Lois & Clark IT Services
web site: http://www.loisandclark.eu
blog: http://www.sharepointdragons.com
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I wanted to explore the idea of using odata. so i can use the various clients to write their own queries instead of me writing them all and exposing them. especially since its all linq queries to a database underneath. I feel that I am missing some specific
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Good or Bad: Repository pattern with Entity framework??

Suggestions about not to use enttity framework because:
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2) So, what the use of having one more repository pattern over an exisitng repositroy pattern (i.e Entity framework)
Please suggest.
Thanks in advance!!

I've used both nHibernate and the Entity Framework 6 and nHibernate wins hands down as the best orm, despite it's learning curve. ORMs can be massive timesavers as you don't end up writing boiler plate db access code.
I used 3 different versions on nHibernate over the years. I didn't paticulalry care for any version of nHibernate. I much prefer EF over nHibernate any day of the week, month or year.
Unlike the previous responder I disagree with testability, each repository should have it's own interface. And if implemented correctly it can save tones of time as you need only mock one or two repository methods rather than 10s or 100s of database
gateway call using one class per table.
What? Like a DAO can't have an interface, which is just as testable as any repository pattern using an interface when using a test harnerss and testproject to test the DAO? And one has to go beyond some generic repository pattern in
unit, functional and intergation testing when it comes to data access.
Unlike you, I want complete control of the object all aspects of it even in its usage of other DAO(s) that could or would be used, which the repository pattern doesn't cut it for me.
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Oracle XE 11g and Entity Framework 4.4

I have Windows Server 2008 R2 32bit and Oracle 11g Release 2 Express Edition installed on my server machine.
I have Windows 7 Pro 64bit, Visual Studio 2010 SP1 32bit, .NET 4.0 and Oracle .NET Data Provider (ODTwithODAC1120320_32bit) installed on my development machine.
The data provider download mentioned Entity Framework support. Existing tutorials on how to use Oracle with the Entity Framework makes me believe that EF is indeed supported! But when I try to create a new ADO.NET Entity Model, the Oracle data provider nor data source isn't listed!
Image: http://i.stack.imgur.com/4SnW8.png
On the other hand, if I want to create a new database connection, via the Server Explorer view, there are no problems connection to Oracle's DB.
Image: http://i.stack.imgur.com/ipXSV.png
The reason I need Entity Framework support is because we're migrating from MSSQL to Oracle and are looking for the most painless route to do so.
Edited by: 916761 on Dec 4, 2012 3:24 AM

I had to create a New Connection, when the dropdown menu didn't contain it.

Entity Framework 6 and Odata v4

I have built a simple WebAPI 2.2 project, using Entity Framework 6 and OData v4. I have a SQL server database that exists and would like to build an OData service for read-only reporting purposes. the database is a simple
two table database in test that represents a possible development effort. The primary key on the Primary table is the configid (auto increment). The Primary key on the secondary table is the combination of the configid (link to primary), and the date descending.
There is typically one update of the data per day and I need the most recent first.
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I recall reading somewhere that Entity Framework requires a unique id on every table... is this true, and would that solve the problem? Altering the database in test would be easy enough... in practice however, not so much! Options?
Primary Table:
configid: int [primary key]
name: string
Secondary Table:
configid: int (link to primary)
date: datetime
data: varchar(200)
I created a new Web API 2.2 project and added the Entity Frameworks 6.1.2 and Odata 4.x.

Hello Stewart,
According to your description, it seems that your issue is more related the Odata RestAPI, I suggest you could post it to the WebAPI forum:
http://forums.asp.net/1246.aspx/1?Web+API
And for paging querying in WebAPI, there is a blog I think which might be helpful:
http://blogs.msdn.com/b/youssefm/archive/2013/02/19/paging-with-asp-net-web-api-odata.aspx
Regards.
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Heavy Locks on the Entity Framework Database

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