SQL Database development

Jefferson Elias

How to automatically maintain Full-Text indexes and catalogs

September 21, 2017 by

Introduction

In a previous article entitled Hands on Full-Text Search in SQL Server, we had an overview on the Full-Text feature as it’s implemented in SQL Server. We saw how to create Full-Text indexes and that they were stored inside a container called a Full-Text catalog. We’ve also seen that, by design, this kind of index will generate a fragmentation.

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Prashanth Jayaram

How to Capture Database(s) usage stats using sp_spaceused and PowerShell

September 11, 2017 by

Today’s businesses work with huge volumes of data. Sometimes, understanding the granularity of the data is helpful in data administration. Understanding the granularity poses unique challenges though and the database administrator needs to balance the key business and technical metrics of the environment. One of the key technical metrics is disk space estimation, which is vital to capacity planning and forecasting. The simplest way to get this information is by using the system stored procedure, called, sp_spaceused. The growth metrics can be captured periodically and stored in a central repository, a repository dedicated to helping with capacity planning and forecasting the disk requirements. This is a critical part of the day-to-day activities of a database administrator.

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Neeraj Prasad Sharma

Nested Loop Joins in SQL Server – Batch Sort and Implicit Sort

September 1, 2017 by

In SQL Server, it`s not always required to fully understand the internal structure, especially for performance and optimization, if the database design is good, because SQL Server is a very powerful Relational Database and, as such, it has many inbuilt optimization processes which assure a response to the users as fast as possible. But it is always beneficial for the SQL Server developers and administrators to understand the internal structure of the SQL Server so that they can understand and fix the problems that slowed the response of the Database.

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Jefferson Elias

Hands on Full-Text Search in SQL Server

August 25, 2017 by

Introduction

In most cases, we will use clustered and non-clustered indexes to help a query go faster, but these kinds of indexes have their own limitations and cannot be used for fast text lookup. For instance, a LIKE operator will lead SQL Server to scan the whole table in order to pick up values that meet the expression next to this operator. This means it won’t be fast in every case, even if an index is created for considered column.

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Prashanth Jayaram

Multi-server Script to Find Orphaned Data Files using PowerShell

August 23, 2017 by

Having worked in busy dev-test environments, it isn’t uncommon to come across situations where someone detached a database from an SQL server, but forgot to reattach it, or drop it from the server. The next task we are then required to undertake, upon coming across such a situation, is to clean up the traces. This task can be complicated if the detached databases get deregistered from the SQL Server metadata catalog.

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Sifiso W. Ndlovu

How to replace ASCII special characters in SQL Server

August 7, 2017 by

One of the important steps in an ETL process involves the transformation of source data. This could involve looking up foreign keys, converting values from one data type into another, or simply conducting data clean-ups by removing trailing and leading spaces. One aspect of transforming source data that could get complicated relates to the removal of ASCII special characters such as new line characters and the horizontal tab. In this article we take a look at some of the issues you are likely to encounter when cleaning up source data that contains ASCII special characters and we also look at user-defined function that could be applied to successfully remove such characters.

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Daniel Calbimonte

How to email SQL query results to your smartphone using the sp_send_dbmail stored procedure

July 24, 2017 by

Introduction

Sometimes there are tasks that require too much time to finish during business hours and we need to leave the office with some still pending like migration of data, backups or long running queries. In such cases we would still want to receive an email in our smartphones to make sure that the job was completed successfully.

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Ahmad Yaseen

How to simplify SQL Server Database Object usage with Synonyms

July 20, 2017 by

The concept of SQL Server Synonyms was introduced the first time in SQL Server 2005 as an alias name that references an existing database object, replacing its fully qualified name. In this way, it makes the database object more portable and provides more flexibility for the clients to reach and maintain it. You can imagine Synonyms as a layer of abstraction that provides us with an easy way to connect to and manage the database objects without the need to identify the real name and location for these objects.

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Ben Richardson
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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.

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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.

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Prashanth Jayaram

Top string functions in SQL Server 2017

June 8, 2017 by

SQL Server 2017 has been in the talk for its many features that simplify a developer’s life. With the previous versions, developers had to write T-SQL, or user-defined functions using temporary tables, and build complex logic, just for string manipulation. In almost every database I work with, I see many user-defined functions for string manipulation and string aggregation.

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Sifiso W. Ndlovu

Understanding the Impact of NOLOCK and WITH NOLOCK Table Hints in SQL Server

June 6, 2017 by

Every once in a while, SQL Server database administrators find themselves in disagreements with their application developer counterparts – particularly when it comes to some of the latter’s Transact SQL (T-SQL) developmental practices. One of my first observations when I joined my current employer is that almost all T-SQL scripts written by application developers uses the NOLOCK table hint. However, from the interactions that I have had with these esteemed developers it doesn’t seem like they understand how the NOLOCK table hint works. Furthermore, although they seem to be aware of a distinction between NOLOCK and the WITH NOLOCK table hint, they again do not seem to comprehend how the two differ from one another. In this article, I explore the internal workings of the NOLOCK table hint and examine the implications of omitting the WITH keyword.

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Ahmad Yaseen

Compression and decompression functions in SQL Server 2016

June 2, 2017 by

The concept of data compression is not a new on for SQL Server Database Administrators , as it is was introduced the first time in SQL Server 2008. In that SQL Server version, you were able to configure the compression at the row and page levels on the table, index, indexed view or the partition. The row and page level compression is not the best choice in all cases, as it does not work well on the Binary Large Objects (BLOB) datatypes, such as the videos, images and text documents.

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