Ahmad Yaseen

Ahmad Yaseen

Ahmad Yaseen

Ahmad Yaseen is a SQL Server database administration leader at Aramex International Company with a bachelor’s degree in computer engineering as well as .NET development experience.

He is a Microsoft Certified Professional with a good experience in SQL server development, administration, performance tuning, monitoring and high availability and disaster recovery technologies. Also, he is contributing with his SQL tips in many blogs

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Ahmad Yaseen
SQL Server Always on Failover Cluster topography

SQL Server Transaction Log and High Availability Solutions

March 21, 2019 by

In the previous article of this series on the SQL Server transaction log, we discuss the SQL Server database recovery models, Full, Simple and Bulk-Logged, and the how the recovery model option of the database affects the way the SQL Server Engine works with the transaction logs. In this article, we will discuss the different types of high availability and disaster recovery solutions and the role of the SQL Server transaction log in these technologies.

SQL Server Transaction Log and Recovery Models

February 27, 2019 by

In the previous articles of this series (see TOC at bottom), we discussed the main concept of the SQL Server transaction, the internal architecture of the SQL Server Transaction Log and finally the Virtual Log File and the best practices in managing the VLFs. In this article, we will go through the relationship between the SQL Server Transaction Log and the three database recovery models.

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Auditing by Reading the SQL Server Transaction Log

February 25, 2019 by

In the previous articles of this series, we discussed the reasons behind auditing the different SQL Server instance and database events, how to audit the SQL Server instance manually and using the Extended Events and Triggers methods. In this article, we will show how to audit your SQL Server instance by reading the content of the SQL Transaction Log file of the user database.

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Creating a SQL Server audit using SQL Server Extended Events and Triggers

February 13, 2019 by

This article will provide an overview of manually creating a SQL Server audit using SQL Server Extended events and triggers. It will provide an overview of SQL tracing/profiling as well as extended events. I’ll walk you through how to create a new extended events session and how to use it, in a worked example, to audit failed logins. Finally, we’ll touch on an auditing approach using triggers

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Implementing a manual SQL Server Audit

January 25, 2019 by

A SQL Server audit can be performed using various number of methods. This includes using the built-in SQL Server Audit feature, using third party tools from the SQL Server market or simply perform the audit task using the legacy methods manually. In the previous article of this series, SQL Server audit overview, we discussed the main concept of a SQL Server audit, the importance of auditing the SQL Server instance changes and the SQL server audit checklists. In this article, we will go through the manual procedures for auditing the SQL Server instance.

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SQL Server Audit Overview

January 9, 2019 by

To fill an optimal role in all business’s computerized operations, information technology systems and infrastructure should be guaranteed, well controlled, aligned with the business goals and secured. Technology auditing ensures the evaluation and examination of these business requirements on an organization.

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SQL Server Transaction Overview

January 8, 2019 by

In general, a Transaction is a single unit of work consists of multiple related tasks that should succeed or fail as one atomic unit. To make the concept of the transaction more familiar and why it should go all or none, imagine one of the most critical transaction examples in our daily life, which is withdrawing money from the ATM.

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Saving your SQL Execution Plan

November 28, 2018 by

In the previous articles of this series (see the index at bottom), we discussed the characteristics of the SQL Execution Plan from multiple aspects, that include the way the SQL Execution Plan is generated by the SQL Server Query Optimizer internally, what are the different types of plans, how to identify and analyze the different components and operators of the Execution Plans, how to work with the plans using different tools and finally, tuning the performance of simple and complex T-SQL queries using the Execution Plans. In this, the last article of this series, but not the least, we will discuss where the Execution plan is stored and how to save it for future use.

Using the SQL Execution Plan for Query Performance Tuning

November 23, 2018 by

In the previous articles of this series (see the index at bottom), we went through many aspects of the SQL Execution Plan, where we discussed how the Execution Plan is generated internally, the different types of plans, the main components and operators and how to read and analyze the plans that are generated using different tools. In this article, we will show how we can use an Execution Plan in tuning the performance of T-SQL queries.

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A new SQL Execution Plan viewer

November 20, 2018 by

In the previous articles of this series (see the index at bottom), we discussed many aspects of the SQL Execution Plans, starting with the main concept of SQL Execution Plan generation, diving in the different types of the plans and showing how to analyze the components and operators of the SQL Execution Plans.

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SQL Execution Plan enhancements in SSMS 18.0

November 13, 2018 by

This article will provide an overview of the SSMS 18.0 with particular focus on improvements to the SQL execution plan feature. To work with Microsoft SQL Server Database Engine, you need to have an environment to edit, debug and deploy scripts written in different languages such as T-SQL, DAX, MDX, XML and JSON. In addition, you need a GUI tool that helps you to configure, query, monitor and administrate your SQL Server instances wherever they are hosted; locally at your machine, on a remote Windows or Linux server or in the cloud. All this can be achieved using SQL Server Management Studio aka SSMS.

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SQL Server Execution Plan Operators – Part 4

October 29, 2018 by

In the previous articles of this series, we went through three sets of SQL Server Execution Plan operators that you will meet with while working with the different Execution Plan queries. We described the Table Scan, Clustered Index Scan, Clustered Index Seek, the Non-Clustered Index Seek, RID Lookup, Key Lookup, Sort, Aggregate – Stream Aggregate, Compute Scalar, Concatenation, Assert, Hash Match Join, Hash Match Aggregate , Merge Join and Nested Loops Join Execution Plan operators. In this article, we will dive in the fourth set of these SQL Server Execution Plan operators.

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SQL Server Execution Plan Operators – Part 3

October 29, 2018 by

In the previous articles of this series, we discussed a group of SQL Server Execution Plan operators that you will face when studying the SQL Execution Plan of different queries. We showed the Table Scan, Clustered Index Scan, Clustered Index Seek, the Non-Clustered Index Seek, RID Lookup, Key Lookup and Sort Execution Plan operators. In this article, we will discuss the third set of these SQL Execution Plan operators.

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SQL Server Execution Plan Operators – Part 2

October 26, 2018 by

In the previous article, we talked about the first set of operators you may encounter when working with SQL Server Execution Plans. We described the Non Clustered Index, Seek Execution Plan operators, Table Scan, Clustered Index Scan, and the Clustered Index Seek. In this article, we will discuss the second set of these SQL Server execution plan operators.

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SQL Server Execution Plan Operators – Part 1

September 12, 2018 by

In the previous articles of this series, SQL Server Execution Plans overview , SQL Server Execution Plans types and How to Analyze SQL Execution Plan Graphical Components, we discussed the steps that are performed by the SQL Server Relational Engine to generate the Execution Plan of a submitted query and the steps performed by the SQL Server Storage Engine to retrieve the requested data or perform the requested modification operation.

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How to Analyze SQL Execution Plan Graphical Components

September 7, 2018 by

In the previous articles of this series, SQL Server Execution Plans overview and SQL Server Execution Plans types we went through the different stages that the submitted SQL Server query followed and how it processed by the SQL Server Relational Engine that generates the Execution Plan and the SQL Server Storage Engine that performs the requested data retrieval or modification operation. In addition, we described deeply the different types and formats of the SQL Server Execution Plans that can be used for queries performance troubleshooting purposes. In this article, we will discuss the graphical query plan components and how to analyze it.

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SQL Server Execution Plans types

July 23, 2018 by

In the previous article, we described, in detail, the different stages that a submitted SQL Server query goes through and how it processed by the SQL Server Relational Engine. The SQL Server Relational Engine generates the Execution Plan and the SQL Server Storage Engine performs the requested data retrieval or modification process. In this article, we will discuss the different types and formats for SQL Server Execution Plans.

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SQL Server Execution Plans overview

July 4, 2018 by

In this series of articles, we will navigate the SQL Server Execution Plan ocean, starting from defining the concept of the Execution Plans, walking through the types, components and operators of Execution Plans analyze execution plans and we’ll finish with how to save and administrate the Execution Plans.

When you submit a T-SQL query, you tell the SQL Server Engine what you want, but without specifying how to do it for you. Between submitting the T-SQL query to the SQL Server Database Engine and returning the query result to the end user, the SQL Server Engine will perform four internal query processing operations, to convert the query into a format that can be used by the SQL Server Storage Engine easily use to retrieve the requested data, using the processes assigned to the SQL Engine from the Operating System to work on the submitted query.

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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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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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Maintaining SQL Server indexes

May 31, 2018 by

In the previous articles of this series (see the full article TOC at bottom), we discussed the internal structure of SQL Server tables and indexes, the guidelines that you can follow in order to design a proper index, the list of operations that can be performed on the SQL Server indexes, how to design effective Clustered and Non-clustered indexes, the different types of SQL Server indexes (above and beyond Clustered and Non-clustered indexes classification), how to tune the performance of the inefficient queries using different types of SQL Server Indexes and finally, how to gather statistical information about index structure and the index usage. In this article, the last article in this series, we will discuss how to benefit from the previously gathered index information in maintaining SQL Server indexes.

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Gathering SQL Server indexes statistics and usage information

May 24, 2018 by

In the previous articles of this series (see the full article TOC at bottom), we discussed the internal structure of both the SQL Server tables and indexes, the best practices that you can follow in order to design a proper index, list of operations that you can perform on the SQL Server indexes, how to design effective Clustered and Non-clustered indexes, the different types of SQL Server indexes, above and beyond Clustered and Non-clustered indexes classification and finally how to tune the performance of the bad queries using the different types of SQL Server Indexes. In this article, we will discuss how to gather statistical information about the index structure and the index usage information.

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