Vitor Montalvão

SQL Server system databases – the msdb database

July 14, 2017 by

Introduction

This article is the third I am writing about Microsoft SQL system databases.

In this article, I will focus only on the msdb database, one of the four system databases that exist in any MSSQL instance:

Read more »
Simon Liew

SQL Server Logins, Users and Security Identifiers (SIDs)

July 12, 2017 by

Abstract

Logins and Users are basic security concepts in SQL Server. They are often, and incorrectly, considered to be pretty much one in the same so it is sometimes confusing to some SQL Server users. Another important security concept tied to a login and user in SQL Server is Security Identifiers (SID). This article will explain these concepts through a step-by-step demonstration. This article will focus on the Windows login and provide some specific usage scenarios.

Read more »
Ben Richardson
C:\Users\ben.ACUITYPLC\Desktop\screenshot2.png

How to use SQL Server built-in functions and create user-defined scalar functions

July 7, 2017 by

A function is a set of SQL statements that perform a specific task. Functions foster code reusability. If you have to repeatedly write large SQL scripts to perform the same task, you can create a function that performs that task. Next time instead of rewriting the SQL, you can simply call that function. A function accepts inputs in the form of parameters and returns a value. SQL Server comes with a set of built-in functions that perform a variety of tasks.

Read more »
Thomas LeBlanc

Analysis Services (SSAS) Cubes – Dimension Attributes and Hierarchies

July 5, 2017 by

In Data Warehouse language, slicing and dicing is done with Dimension Attributes. Sometime a developer feels the need to provide everything to end users, whereas seasoned Business Intelligence Architects understand to provide only the attributes from the requirements. It is a hard path to follow and the seasoned architect’s experience might be the better option.

Read more »
Ahmad Yaseen

SQL Server SET Options that Affect the Query Result – SET CONCAT_NULL_YIELDS_NULL, SET NUMERIC_ROUNDABORT, SET QUOTED_IDENTIFIER, SET NOCOUNT, SET XACT_ABORT

July 4, 2017 by

In the previous article of this two-part series SQL Server SET Options that Affect the Query Result – SET ANSI_NULLS, SET ANSI_PADDING, SET ANSI_WARNINGS and SET ARITHABORT, we described the first four SQL Server SET options and showed practically how setting these options ON and OFF affects the SQL Server Database Engine behavior and the query result. To recall, SQL Server SET options are a group of session-level options that control how the SQL Server behaves on the database session level, and the option value can be changed using the SET T-SQL command for the current session that you execute the SET command on.

In this article, we will describe another five SET options and see how turning it ON and OFF will change the SQL Server behavior and the query result.

Read more »
Ahmad Yaseen

SQL Server SET Options that Affect the Query Result – SET ANSI_NULLS, SET ANSI_PADDING, SET ANSI_WARNINGS and SET ARITHABORT

June 30, 2017 by

SQL Server provides us with a number of options to control SQL Server behavior on the connection level. These session-level options are configured using the SET T-SQL command that change the option value for the session on which the SET command is executed. Changing the default value of these session-level configuration affects how the session queries will be executed affecting the query result. The performed change on a session-level option will be applied to the current session until its value is reset or until the current user’s session is terminated.

Read more »
Jefferson Elias

How to use SQL Server Extended Events to parse Deadlock XML and generate statistical reports

June 29, 2017 by

Introduction

Context In previous article entitled “How to report on SQL Server deadlock occurrences“, we’ve seen how to extract deadlock information from either system_health or specialized Extended Event and store this information into a table in a SQL Server database. We also discussed a simple report which leads to the creation of a deadlock occurrences timeline. Read more »
Vitor Montalvão

Configuration, operations and restrictions of the tempdb SQL Server system database

June 28, 2017 by

Introduction

tempdb is one of the 4 system databases that exists in all SQL Server instances. The other databases are master, model and msdb. In case of using Replication, a fifth system database named distribution will also exist. You can find all existing system databases in SQL Server Management Studio (SSMS) under the Databases / System Databases folder:

Read more »
Ed Pollack

Collecting, aggregating, and analyzing missing SQL Server Index Stats

June 27, 2017 by

Description

Indexing is key to efficient query execution. Determining what indexes are needed to satisfy production needs is often a game of cat and mouse in which we are forced to react to performance problems after they are brought to our attention. Being able to proactively monitor index needs and respond effectively before complaints are received can save us immense time while preventing costly performance messes.

Read more »
Sifiso W. Ndlovu

How to calculate work days and hours in SQL Server

June 26, 2017 by

Like any other enterprise RDBMS system, SQL Server ships with several built-in functions that make developers’ T-SQL code clean, convenient and reusable. To demonstrate the efficiency of functions, say we needed to retrieve a server name for one of our SQL Server instances. Well, one of doing this would be to write a SELECT statement that would query the system view [sys].[servers] from the master database as shown in Script 1.

Read more »
Ahmad Yaseen

SQL Server 2016 Memory-Optimized Tables – The Checkpoint operation

June 21, 2017 by

The SQL Server Database Engine stores data changes in the buffer pool, in memory, before applying it to the database files, for I/O performance reasons. After that, a special kind of background process, called Checkpoint, will write all of these not reflected pages, also known as Dirty Pages, to the database data and log files periodically.

Read more »
Prashanth Jayaram

How to use Python in SQL Server 2017 to obtain advanced data analytics

June 20, 2017 by

On the 19th of April 2017, Microsoft held an online conference called Microsoft Data Amp to showcase how Microsoft’s latest innovations put data, analytics and artificial intelligence at the heart of business transformation. Microsoft has, over the last few years, made great strides in accelerating the pace of innovation to enable businesses to meet the demands of a dynamic marketplace and harness the incredible power of data—more securely and faster than ever before.

Read more »
Minette Steynberg

How to create a chatbot with Azure in 5 minutes

June 19, 2017 by

Introduction

As we enter an era of artificial intelligence and serverless computing, the tools to help us create perceived intelligent programs have become so advanced and intuitive that the effort in building a fully functional Q and A chat bot has become almost negligible.

In this article, I will show you how to do just that.

Read more »