Usage of UUID as a primary key for tables has a bunch of pros, including the option to retrieve IDs for objects created in a client application on its own without calls to the database server. However, usage of UUID as a primary key has a con: GUIDs generated by the client application may be not quite SQL Server-friendly that can lead to the overhead during the addition of a new record. (more…)
Assume you have products and categories. A client says that it is necessary to use other business processes for the categories with the rating value higher than 50. You have a solid experience and you understand that tomorrow this value may be different – 127.37. As you want to avoid this situation, you write the code in the following way:
Hangfire is a multi-threaded and scalable task scheduler built on client-server architecture on .NET stack (Task Parallel Library and Reflection) with the intermediate storage in a database. There is a free LGPL v3 version with open source. In this article, we are going to explore how to use Hangfire.
When adding or modifying a large number of records (10³ and more), the Entity Framework performance is far from perfect. The reasons are architectural peculiarities of the framework, and non-optimality of the generated SQL. Leaping ahead, I can reveal that saving data through a bypass of the context significantly minimizes the execution time. (more…)
This article describes patterns and methods available in ASP.NET Core MVC.
I would like to emphasize that we will explore only authorization (a process of verifying user’s rights), rather than authentication. Thus, we will not use ASP.NET Identity, authentication protocols, etc. In addition, we will have a look at some examples of using server code and Core MVC source code. At the end of the article, you will find a link to a test project.
An interesting project related to the task queue processing come to the company I work for. It was previously developed by another team. We needed to detect and resolve issues that occurred at high load on the queue.
In short, the project consisted of several databases and applications located on different servers. A ‘Task’ in the given project is a stored procedure or a .NET application. Correspondingly, the ‘task’ must be performed on a certain database and on a certain server.
All queue-related data is stored on the dedicated server. As for the servers at which tasks must be performed, they store only metadata. That is, procedures, functions, and service data related to this server. All task-related data comes from a Linked Server. (more…)
In our projects, we have to cope with different tasks. To solve some of them, we use dynamic T-SQL.
Why do we need dynamic T-SQL? Well, it is up to you.
In one of the projects, we have solved the task of building dynamic reports, and in others — data migration. Dynamic T-SQL is essential when you need to create, modify, get data or objects, but values or names come as parameters. For sure, it may seem unreasonable. Still, such tasks are possible. Later in the article, we will see several examples.
One of the available algorithms to join two tables together in SQL Server is Nested Loops. The nested loops join uses one join input as the outer input table and one as the inner input table. The outer loop iterates the outer input table row by row. The inner loop, executed for each outer row, searches for matching rows in the inner input table.