Tag: performance

A Simple Use Case for Indexes on Primary Keys

Kenneth Igiri Leave a comment
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Introduction

Recently we encountered an interesting performance problem on one of our SQL Server databases that process transactions at a serious rate. The transaction table used to capture these transactions became a hot table. As a result, the problem showed up in the application layer. It was an intermittent timeout of the session seeking to post transactions.

This happened because a session would typically “hold on” to the table and cause a series of spurious locks in the database.

CodingSight - A Simple Use Case for Indexes on Primary Keys
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How CTE Can Aid In Writing Complex, Powerful Queries: A Performance Perspective

Tomas Helgi Johannsson Leave a comment
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We often see poorly written complex SQL queries running against a table or tables in databases. Those queries make the time of execution very long and cause consuming huge CPU and other resources. Still, complex queries provide valuable information to the application/person running them in many cases. Therefore, they are useful assets in all varieties of applications.

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SQL Server Lock Escalation

Kenneth Igiri Leave a comment
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Introduction

Relational databases follow the ACID properties in how they implement transactions – Atomicity, Consistency, Isolation, and Durability. Isolation is necessary to ensure that multiple transactions can’t cause changes to data and leave the eventual results inconsistent. To guarantee that the operations remain isolated, SQL Server applies Locking mechanisms.

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Update SQL Server statistics using a database maintenance plan

Nisarg Upadhyay Leave a comment
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Database backups, integrity checks, and performance optimizations are core regular tasks of DBAs. The client data is very important for a DBA to manage the database backup and make sure the integrity of the backups. So if something goes wrong with a production database, it can be recovered with minimum downtime. The database integrity checks are also important because, in the case of database corruption, it can be corrected with minimum downtime and data loss. Managing database performance is also important. Managing database performance is a combination of multiple tasks. Read More

Overview of Data Compression in SQL Server

Prashanth Jayaram Leave a comment
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The database is a critical and vital part of any business or organization.  The growing trends predict that 82% of enterprises expect the number of databases to increase over the next 12 months. A major challenge of every DBA is to discover how to tackle massive data growth, and this is going to be a most important goal. How can you increase database performance, lower costs, and eliminate downtime to give your users the best experience possible? Is data compression is an option? Let’s get started and see how some of the existing features can be useful to handle such situations.

In this article, we are going to learn how the data compression solution can help us optimize the data management solution. In this guide, we’ll cover the following topics:

  • An overview of compression
  • Benefits of compression
  • An outline about data is compression techniques
  • Discussion of various types of data compression
  • Facts about data compression
  • Implementation considerations
  • and more…

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How to Test Azure Web Application Performance through Microsoft Azure and Visual Studio

Amarendra Babu Leave a comment
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Before deploying your application into production, doing a performance load test is imperative for measuring future performance and ensure that your application is production-ready.

Testing is essential for every application to make sure that any application works and performs according to the desired requirements. During the application testing process, we can attempt and find out if any imperfections are remaining in the application. There are numerous sorts of testing like functional testing, unit testing, acceptance testing, and integration testing. We compose Functional and UI tests to see whether the application is working as per the requirements. Read More

Move Datafiles in SQL Server – Part 1

Kenneth Igiri Leave a comment
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Introduction

There are a number of situations which would warrant the movement of database files or transaction log files from one volume to another on the same server. These may include:

  1. The need to format the volume assuming it was not formatted properly when SQL Server was installed. Recall that when installing SQL Server, it is recommended that 64K allocation unit size is used to format the volumes. If this is not done at the point of installation and needs to be done later, it will obviously require preserving a backup of the database fist or creating a new, properly formatted volume and moving the database to this new volume.
  2. The need to use a new volume assuming the limits have been reached for the underlying storage. A good example would be the 2TB limit of a VMware Data Store. This is the case as of VSphere 5.0. Higher versions of VSphere have much higher limits.
  3. The need to improve performance by managing IO. One more reason you may want to move datafiles is performance. There are cases where a database is created with multiple datafiles all sitting on one disk until it becomes obvious, as the database grows, that the you have created a “hot region” in the storage layer. One solution would be creating new data files and rebuilding clustered indexes, another would be moving data files.

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