In this article, we will discuss how to copy and deep copy javascript objects. Read More
Author: Andrey Langovoy
Andrey Langovoy is a team leader at Devart. He takes part in development and testing database management tools for SQL Server, writes articles about SQL Server and contributes to open source projects, MSDN and MDN.
Creating Excel in JavaScript
In this article, we will create an excel-like application that takes about 30 rows of JS code, with automatic saving to localStorage. No third party libraries are used. To create a formula, you can use “=”. You can also create arbitrary expressions like (=A1+B2*C3) and detect circular references. Read More
SQL Server 2016: New T-SQL Features
In this article, I would like to describe several new T-SQL features available in SQL Server 2016: DROP IF EXISTS, SESSION_CONTEXT, MAXDOP, FORMATMESSAGE, COMPRESS and DECOMPARESS, DATEDIFF_BIG, AT TIME ZONE, FOR JSON and other. Read More
Detecting Internet Explorer in JavaScript
There are several simple ways to detect whether the web browser is IE or not?
In the following code example, the variable returns true in Internet Explorer and false in all other browsers. This is possible because of an IE bug. Read More
How to Pass Parameters in Dynamic T-SQL Query
Developers are often faced with the need to build a dynamic query, however, there are a number of pitfalls, which we will discuss further in this article. Read More
Database Checkpoints in SQL Server
In this article, we will talk about SQL Server Checkpoints.
To enhance performance, SQL Server applies modifications to database pages in memory. Often, this memory is called the buffer cache or buffer pool. SQL Server does not flush these pages to disk after every change. Instead, the database engine does checkpoint operation on each database from time to time. The CHECKPOINT operation writes the dirty pages (current in-memory modified pages) and also writes details about the transaction log. Read More
In-Memory OLTP: What’s new in SQL Server 2016
SQL Server development team has added new features to In-Memory OLTP. All these features allow you to build new applications as well as to increase overall performance and scaling. Below is the list of In-Memory OLTP improvements that are available in SQL Server 2016 CTP3. Read More
SQL Server: DELETE vs TRUNCATE
T-SQL provides two keywords that allow you to delete data from a table. They are DELETE and TRUNCATE. These are alike in what they are doing, however, they use vastly different methods. In this article, we discuss underlying mechanisms for these keywords. Read More
SQL Server Unit Testing with tSQLt Framework
In this article, we will talk about the tSQLt framework — a free database unit testing framework for Microsoft SQL Server. You can use tSQLt to create unit tests for SQL Server 2005 (service pack 2 required) and all further versions. The main convenience is that you do not need to switch between various tools to create code and unit tests. Read More
Dive Into SQL Server Transaction Log — Part 3
This is the third article in a series of articles about SQL Server transaction log. In this article, we will have a look at log record details.
Log Records
Log records are the core of the logging and recovery mechanisms. A log record describes a single change in a database. Thus, every change to a database has a log record or log records that help to describe that particular change. Although you do not need to understand log record details, to understand what is going on with logging and recovery, those details are extremely interesting. Read More