Indexes

Hadi Fadlallah
Download Manticore search for Windows 64-bit

Manticore search: a continuation of the Sphinx search engine

September 14, 2020 by

In this article, we will be talking about Manticore Search, which is an open-source search engine first released in 2017 as a fork of the Sphinx search engine. We will try to describe this search engine briefly, mention some of its differences from the Sphinx search engine, and we will provide a step-by-step guide on how to build full-text indexes from SQL Server databases. Finally, we will show how to connect to the Manticore engine from the SQL Server management studio using a linked server object. In our previously published articles in this series, we talked briefly about the Sphinx search engine and how to create full-text indexes from SQL Server databases.

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Jignesh Raiyani
Rebuild Index

How to identify and resolve SQL Server Index Fragmentation

May 27, 2020 by

In this article, we will learn how to identify and resolve Index Fragmentation in SQL Server. Index fragmentation identification and index maintenance are important parts of the database maintenance task. Microsoft SQL Server keeps updating the index statistics with the Insert, Update or Delete activity over the table. The index fragmentation is the index performance value in percentage, which can be fetched by SQL Server DMV. According to the index performance value, users can take the indexes in maintenance by revising the fragmentation percentage with the help of Rebuild or Reorganize operation.

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Ben Richardson
Example Of Records Using A Clustered Index

Using SQL CREATE INDEX to create clustered and non-clustered indexes

January 10, 2020 by

The SQL CREATE INDEX statement is used to create clustered as well as non-clustered indexes in SQL Server. An index in a database is very similar to an index in a book. A book index may have a list of topics discussed in a book in alphabetical order. Therefore, if you want to search for any specific topic, you simply go to the index, find the page number of the topic, and go to that specific page number. Database indexes are similar and come handy. Particularly, if you have a huge number of records in your database, indexes can speed up the query execution process. There are two major types of indexes in SQL Server: clustered indexes and non-clustered indexes.

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Jignesh Raiyani

Query Performance Issues on VARCHAR Data Type Using an N Prefix

December 6, 2019 by

In this article, we’ll discuss data type VARCHAR and query performance issues associated with utilizing the lower level VARCHAR data type. CHAR, VARCHAR and NVARCHAR are data types that support storing information in text format in a SQL Server database. These data types allow a wide assortment of character sets in the defined field or column in the database table.

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Bojan Petrovic

Optimizing SQL Server index strategies

July 2, 2019 by

Index strategies overview

This article is about techniques for optimizing the SQL Server indexes strategy. It is an appendix of the SQL index overview and strategy article in which I covered different areas like what indexes actually do, how to create them, and I briefly mentioned some index design guidelines. Furthermore, I also presented an example of how to design them by tuning and optimizing queries, so I’ve really tried to cover all but there is always more when it comes to SQL Server indexes.

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Bojan Petrovic

SQL index maintenance

January 23, 2019 by

One of the main DBA responsibilities is to ensure databases to perform optimally. The most efficient way to do this is through indexes. SQL indexes are one of the greatest resources when it comes to performance gain. However, the thing about indexes is that they degrade over time.

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Bojan Petrovic

SQL index overview and strategy

November 27, 2018 by

A SQL index is used to retrieve data from a database very fast. Indexing a table or view is, without a doubt, one of the best ways to improve the performance of queries and applications.

A SQL index is a quick lookup table for finding records users need to search frequently. An index is small, fast, and optimized for quick lookups. It is very useful for connecting the relational tables and searching large tables.

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Rajendra Gupta
SQL Server 2019 columnstore index execution plan

Columnstore Index Enhancements – Index stats update in clone databases

November 9, 2018 by

SQL Server was launched in 1993 on WinNT and it completed its 25-year anniversary recently. SQL Server has come a long way since its first release. At the same time, Microsoft announced a preview version of SQL Server 2019. SQL Server 2019 provides the ability to extend its support to big data, Apache Spark, Hadoop distributed file system (HDFS) and provides enhancements to database performance, security, new features, and enhancements to SQL Server on Linux.

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Ahmad Yaseen

SQL Server indexes – series intro

June 29, 2018 by

Description

In this series, we will dive deeply in the SQL Server Indexing field, starting from the surface by understanding the internal structure of the SQL Server tables and indexes, going deeper by describing the guidelines and best practices that we can follow to design the most efficient index and what operations can be performed on the created indexes. Having these knowledges about the SQL Server indexes, we have all the tools that help us in testing the lower part of the ocean and dive deeper with the two main types of the SQL Server Indexes; the Clustered and Non-Clustered, and the other types of indexes that can be customized to serve us improving your environment. After that, the adventure becomes more interesting when learning how to use this knowledge to tune the performance of our queries and touch the bottom of the ocean. In our way back to the surface, and before celebrating our achievements, we will collect statistical information about these indexes and use this information to maintain the indexes to take benefits from it continuously and gain the best application performance.

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Ahmad Yaseen

Top 25 SQL interview questions and answers about indexes

June 25, 2018 by

Q1: What is the difference between a Heap table and a Clustered table? How can we identify if the table is a heap table?

Heap table is a table in which, the data rows are not stored in any particular order within each data page. In addition, there is no particular order to control the data page sequence, that is not linked in a linked list. This is due to the fact that the heap table contains no clustered index.

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