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6
votes
3answers
10k views

EF Code First uses nvarchar(max) for all strings. Will this hurt query performance?

I have some databases created using Entity Framework Code First; the apps are working and in general I'm pretty happy with what Code First lets me do. I am a programmer first, and a DBA second, by ...
6
votes
4answers
423 views

How to troubleshoot orm queries interfering with other applications

Well, it's hypothetical scenario but what I'm trying to understand is the path to go from a post-morten log (say, an SQL Server Profiler trace) to identify the code on a ORM situation. To make it not ...
6
votes
4answers
5k views

Why does this Entity Framework query perform so bad in MySQL?

Let me give you a little setup. We have a InnoDB table on MySQL 5.1 with close to 20 million records, no foreign keys, and proper indexes for queries we do. We are using the latest 6.3.5 MySQL ...
6
votes
2answers
82 views

SQL server Database statistics degrading after execution

I have been experiencing timeouts while querying my SQL Server DB in particular one table. I tried updating the statistics and it fixed the performance issues for a couple of days. I started digging ...
5
votes
3answers
1k views

Is the ADO.NET Entity Framework known for generating poorly performing queries?

This question is inspired by the comment posted to the latest ServerFault blog post: Are you guys still using LINQ to SQL? I know I can use SQL Server Profiler and/or the ToTraceString method to ...
5
votes
2answers
102 views

New Index on table cause table to be locked really often

Here are my tables : CREATE TABLE [dbo].[Trackers] ( [IdTracker] INT IDENTITY (1, 1) NOT NULL, [IMEI] NVARCHAR (16) NULL, [CreationDate] ...
5
votes
2answers
2k views

Two relationships to same table

i have one transaction table, each transaction has 5-6 contacts involved. each contact has the same fields like name, address, cell, email etc. So the best thing I guess is to use the same contact ...
5
votes
1answer
2k views

How to troubleshoot “client driver has sent multiple requests while the session is in single-user mode”

I'm working with a developer who is struggling to stop the following error: The server will drop the connection, because the client driver has sent multiple requests while the session is in ...
5
votes
1answer
277 views

Clear schema from database without dropping it

I'm working on a school project where I have a SQL Server with a database for my team. I already imported a local database created with Entity Framework. Now the model has changed, table properties ...
4
votes
3answers
1k views

What should I consider when deciding between passing a comma-delimited string to a stored procedure instead of calling it individually per record?

I have to run the same stored procedure for a lot of records (hundreds or thousands, depending on user selection). The procedure is fairly basic: insert a record in two separate tables with some ...
4
votes
2answers
1k views

Why can't I view the SQL Server database created by a web application?

I have an ASP.NET MVC web application deployed to IIS on a Windows Server 2012 machine. When the application first starts, it will create the database and tables it needs if necessary through Entity ...
4
votes
1answer
126 views

Why do async_network_io wait types occur?

Last week something strange happened on our database. All of a sudden, the application blocked for our users who were not able to save new entities etc. After looking at the Activity Monitor of the ...
4
votes
3answers
4k views

NULLs in a composite primary key - SQL Server

I'm trying to work out the best way of creating SQL Server primary keys, foreign keys and constraints to accurately represent my data model in LINQ / Entity Data Objects. Let's assume - for the ...
4
votes
4answers
2k views

How can I generate an Entity-Relationship diagram and SQL DDL from natural language text?

Good morning, Using LaTeX or another text-macro tool/library, how can I use natural language text to describe relationships, then generate an Entity-Relationship Diagram and generate SQL DDL to ...
3
votes
3answers
9k views

Trying to connect to PostgreSQL with Entity Framework via Npgsql and C#

So, I'm new to databases and only have done a little with PostgreSQL before. I have C# (visual studio 2012) and have downloaded the Entity framework (6). I have also downloaded the latest Npgsql data ...
3
votes
1answer
1k views

Database design for an exam system

I am working on creating a simple exam system, in which you are going to be basically able to store students, classes, exams, questions and scores(and some other stuff that those depend on). I am also ...
3
votes
1answer
171 views

Is this a step in the right direction for normalization? SQL 'inheritance' and Many-to-Many relationships

Context: So, this is kind of a compound question, but they go together, and definitely wouldn't make sense split up into separate questions. I've been working on a new database for what will end up ...
3
votes
1answer
555 views

Curious Database building Problem (ER Diagram)

I am trying to build an EER Model for a Autostore that has 5 locations and offers a range of auto products. They offer car repairs and roadworthy tests as a service also. I need to be able to make ...
3
votes
0answers
24 views

Azure SQL DB migration from Visual Studio raises collation error

I want to run a migration in my Azure hosted database. The migration works perfect in several local machines. When I try targeting the Azure database it raises the following exception: Column X is ...
2
votes
1answer
169 views

one table for all blob with a one to one table for metadata which link to one or many tables?

I'm going to start by saying that I'm not a DBA but i got that role in my current project so I'm doing my best. The application must be able to store files(attachments, official documents, etc) The ...
2
votes
1answer
390 views

Schema for 1 <-> 0..1(+), many related but only one primary

Using tools available in SQL Server 2008 and Entity Framework, what is a solid way to represent a one-to-many relationship, where there is an underlying unique relation that I need to enforce? My ...
2
votes
1answer
98 views

Encryption/Decryption with StoredProcedure/View

I'm working on a project that uses EntityFramework for programmers to access the data. We've recently found need to add fields that were determined that need to be encrypted. This will be the first ...
2
votes
1answer
407 views

Referring to super parent or as a separate entity?

I have this person table as super parent, id firstname lastname email telephone ... ... and user table as a child id person_id (FK) password username screenname ... ... They must be 1:1 ...
2
votes
1answer
639 views

Will Entity Framework and/or Linq-To-SQL queries show up as “Adhoc Queries” in SSMS' “Server Dashboard” Report?

Its pretty much all in the title. I have a SQL Server which is showing that 90%+ of CPU Usage and Logical IO Performed is due to "Adhoc Queries" The rest rest of the usage shows up under the actual DB ...
2
votes
1answer
100 views

Can I grant multiple remote LocalService accounts access to a SQL Server database?

I am designing a multi-environment Windows-based software product that will extensively employ Windows services running as LocalService to perform data access operations. All of the data access ...
2
votes
0answers
599 views

Rolling Back Stored Procedures in Entity Framework

I currently working a on project that operates within a transaction in entity framework. Before now all of the changes were made using a DataContext. I need to add a call to a stored procedure using ...
2
votes
0answers
2k views

SQL Server intermittent error 40 Could not open a connection to SQL Server or The network path was not found

I am getting intermittent errors as per the below stack trace. I am using C# Entity Framework with SQL Server 2012 enterprise running on a separate server computer. I can connect and query the DB ...
1
vote
3answers
8k views

What could cause an auto increment primary key to skip numbers? [duplicate]

I have a table created with the following T-SQL: CREATE TABLE [dbo].[TableName]( [id] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY CLUSTERED ( [id] ASC )WITH (PAD_INDEX = OFF, ...
1
vote
2answers
2k views

Reducing size of image returned by view

We are storing a list of images in a table in an image column. These are stored as their raw image size so they can be viewed in their details at full resolution. The problem I have is I want to show ...
1
vote
2answers
630 views

With MS SQL Server are the generated constraint names predictable?

When you create your primary key, and foreign key constraints in a CREATE TABLE script, there are named constraints that are created, such as FK__RecentlyVi__ScId__2764765D ... are these constraints ...
1
vote
3answers
596 views

single select vs multiple selects using limit and offset

Working on a fairly high volume site. There are some tables example - the customers table which gets hit a lot. The problem We are writing a piece of code that selects a bunch of customers and ...
1
vote
1answer
45 views

How to return the difference (columns) between two databases or tables

I have a database that has been updated, many columns have been added. Currently the only way of returning the differences between the two databases is by going through the database.cs class that is ...
1
vote
2answers
48 views

One table or duplicate table with same properties but different dependencies

Disclaimer: I'm new to database modeling so I apologize in advance if the question is unclear or causes any confusion. I am using .NET Entity Framework and have the following tables: An Order can ...
1
vote
2answers
537 views

Replicating schema changes between production and development databases [duplicate]

Not too sure if this would be a good and proper way to go about things, so I apologize if I'm kind of far off. Currently running Microsoft SQL Server 2005, and in this we have a database for a ...
1
vote
2answers
1k views

Microsoft SQL Server how can i detach localdb to run on any computer

I am working on a personal project and have implemented a database system using the Entity Framework code first tutorial on msdn, link below, http://msdn.microsoft.com/en-gb/data/jj193542 I am ...
1
vote
0answers
59 views

Splitting very large working table

I read the good posts here and here, but my scenario is a bit different, I cannot consider that older data becomes read-only data because any record in my Transactions table can be subject to updates ...
1
vote
2answers
71 views

Referencing a single table from all tables in the database

At current, I have around 130 tables in my database, anticipating a growth of circa 200 tables in total. Now I have several tables (well, most of them, actually) that contain properties like ...
1
vote
1answer
532 views

SSIS Package Execution From Visual Studio Unit Test

Hello I am attempting to run a test which contains the following code: string pkgLocation; Package pkg; Application app; DTSExecResult pkgResults; ...
1
vote
0answers
497 views

Can someone please give me hints on normalizing this database and any other helpful hints

I am using Entity Framework 5 to work with this database but I am getting issues with how tblTalkers and tblChatSessions are being mapped in the entity model when imported into Visual Studio. Please ...
0
votes
1answer
12 views

Entity or attribute if only one field beside key and attribute for other entity?

Let's say I have an entity person which has an attribute Email. But the person can have more than one Email address. So I have to put this attribute into a separate table. But what I do not ...
0
votes
1answer
44 views

Help with designing a multi relational schema / domain model

I am in the process of developing a web application with asp.net MVC. I am using Entity Framework to make a connection to my database. I am having trouble with a specific concept in my program. I ...
0
votes
1answer
4k views

SQL keyword difference between MySQL and Oracle 10g?

Good afternoon, Are there differences between Oracle 10g and MySQL with the CREATE, ALTER, DROP, REF, PRIMARY KEY, FOREGIN KEY and attribute variable type keywords? The reason I ask, is I'm planning ...
0
votes
1answer
341 views

self referencing tables with SQL and entity framework

I have many tables in a database and the tables are nearly identical. There are limitations currently on what objects reference other objects. For example I have company,contact and project. Contact ...
0
votes
2answers
66 views

Can I update only the needed changes in a database?

First of all, I apologize if you can't understand very well what I am saying and it can be edit for better understanding of my post. The next example is for better understanding of databases with ...
0
votes
1answer
297 views

Inheritance discriminator column better int or varchar or enum?

What is the best practice for storing a discriminator column ? Does it make any difference ? Any pros/cons of using one over the other ? I am using MySql with Entity Framework but the question goes ...
0
votes
0answers
20 views

Entity Framework using filestream

Does Entity Framework support file I/O using Win32 / .net API's? From online it states that Entity Framework only supports filestream using T-SQL which again can bloat the buffer pool and cause ...
0
votes
1answer
19 views

Foreign key not able to get one to many working

I want to have a one to many relation with player points but I need it in such a way that entity framework sees it as a collection so i can add to it. I mean that one player can have multiple points ...
0
votes
0answers
21 views

SQL architecture question. User entity in 2 tables

I use Symfony 2 framework and standardized bundles to operate entities. So I have somewhat stable User Entity, which is based on the bundle structure. It contains mainly service information like ...
0
votes
1answer
69 views

Database structure for object with dynamic attributes

I am developing a proof of concept for a personalized email sending web application (like MailChimp, but with premade dynamic templates). The general structure is that I have my templates (different ...
0
votes
0answers
48 views

Multiple M-M relationships between tables

I am working on the design of a new database. In this database, we track equipment corrective actions (repair). We have three personnel fields in each Equipment Corrective Action record: initiated ...