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. (more…)
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. (more…)
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 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. (more…)
This article provides a comprehensive list of FREE tools for Microsoft SQL Server database developers and administrators! You can download the following tools and use it in your commercial projects!
Feel free to share the link with your colleagues and friends in Twitter, Facebook or any other way convenient for you! (more…)
Have you ever accidentally executed the TRUNCATE command on a wrong table? This will lead to all data loss. The worst thing is that you will not have a chance to get your data back. In this article, we will have a look how to avoid such situations and have a chance to ROLLBACK TRUNCATE. (more…)
This is the second article in a series of articles about SQL Server transaction log file architecture. In this article, we will have a look at two SQL Server statements that allow examining transaction log details. If you would like to get an introductory information about how SQL Server transaction log works, read Dive Into SQL Server Transaction Log — Part 1 (more…)
Chances are you already know that every SQL Server database contains one or more transaction log files, in addition to data files, that records all the transactions and database modifications made by each transaction. The transaction log is an essential part of any database, and the database administrator must keep it under observation. One of the most important tasks for the database administrator is to truncate the transaction log file to keep it from overflow. Why? Because the transaction log plays the most important role when it comes to the database recovery. (more…)