SQL query performance tuning with I/O statistics and execution plans

Introduction

In a busy system, many things can cause a SQL query to run more slowly than expected or desired. Sometimes, getting a handle on the root cause can involve digging into wait statistics, CPU, memory or network pressure, ferreting out problems in the I/O subsystem, looking for issues in a virtual machine configuration and many other things. Often though, the problem comes down to a simple symptom: the query is doing too much I/O.

August 31, 2017

Multi server script to automatically monitor SQL Server availability

Introduction

As database administrators, we obsess over a few things, things we don’t compromise on. One of them is SQL Server availability. We may use several tools, scripts, and/or configurations, in addition to constant oversight to ensure that the database is always available. We sometimes even go that extra mile to ensure availability, because we know it is easier to ensure a database is available than deal with the outcome of unavailability. In this post, let us look at some of the easiest ways to ensure availability.

August 29, 2017

Creating SharePoint farm documentation

Installing SharePoint farms can go from “click-click-next” to a full day work depending on the configuration level for the server farm. For administrators that are new to the farm, it can be quite troublesome to learn the farm’s configuration. In those cases, it is important to have a farm documentation with all the setting information. SharePoint documentation is also important for recreating sets of configurations for when failure occur.

August 25, 2017

How to create and use CRUD stored procedures in SQL Server

Working with a database, at some point, usually means working with CRUD operations. Although not complex, CRUD operations are often used with SQL, so it is of great importance for developers to learn about how to create them efficiently and easily.

August 25, 2017

How to prevent accidental data loss from executing a query in SQL Server aka “Practicing safe coding”

We sometimes may find ourselves in a stressful situation at work, where for example we need to update or delete some records in our database. We’ve all been there. Right after we click that “Execute” button, we realize we forgot to include a WHERE clause and the entire table is wiped instead of only one row. Although things like this can happen to the best of us, we can plan ahead and take preventative measures to make sure, we don’t get negatively impacted by the consequences of such a mistake.

August 17, 2017

How to identify and solve SQL Server index scan problems

Introduction

Once you have a SQL Server query working correctly – that is, returning the correct results or properly updating a table with update, insert or delete operations, the next thing you usually want to look at is how well the query performs. There are simple things that you can do to improve the performance of a critical query; often those improvements can be quite dramatic!

In this article, we’ll look at one of the most-frequently-seen performance killers: SQL Server index scans. Starting with a simple example, we’ll look at what SQL Server does to figure out how to return the requested result, at least from a high level. That will allow us to zero-in on any bottlenecks and look at strategies to resolve them.

August 10, 2017

How to automatically pull SQL Server database objects from a shared script folder to a local database

Challenge

As it was explained in article on How to automatically compare and synchronize SQL Server database objects with a shared script folder, this article will explain the solution for the reverse process, when changes needs to be pulled from a shared script folder to a local database. This might be helpful if a developer returns from vacation and wants to catch up to the team with all changes or if a build has been tweaked, as part of a recent test/delivery and the latest version needs to be re-propagated directly to all developers via their local development database

July 4, 2017

How to automate and schedule SQL Server index defragmentation

Introduction

SQL Server maintenance is not a one-time event, but rather a part of a continuous process. Apart from regular backups and integrity checks, performance improvements can be achieved with index maintenance. If done at regular intervals, it can free the server to focus on other requests rather than losing time scanning for fragmented indexes.

June 5, 2017

How to backup multiple SQL Server databases automatically

In situations with few databases, maintaining the regular backup routine can be achieved easily, either with the help of a few simple scripts, or by configuring a SQL Server agent job that will perform the backup automatically. However, if there are hundreds of databases to manage, backing up each database manually can prove to be quite time-consuming task. In this case, it would be useful to create a solution that would back up all, or multiple selected SQL Server databases automatically, on the regular basis. Furthermore, the solution must not impact the server performance, or cause any downtime.

June 1, 2017