dba-tips

Part 2: MDX Code Development for Beginners

By Dan King on Feb 29

Welcome back to part 2 of MDX Code Development for Beginners.  In part 1, we looked directly at the basic SELECT FROM clause in T-SQL and converted it to the SELECT ON COLUMNS ON ROWS FROM which is the equivalent in MDX.  In part 2 we will be looking into the different BASIC filters that can be introduce into the SELECT statement in comparison to T-SQL  “WHERE” clauses.

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How to Configure Read-Only Routing for an Availability Group

By John Handra on Feb 09

One of the main benefits of an AlwaysOn Availability Group is being able to read off of the secondary replicas. However, Read-Only Routing is not automatically configured when you first build your AlwaysOn Availability Group. To fully utilize an AlwaysOn Availability Group and take full advantage of having read-only connections connect to your secondary database, you will have to configure Read-Only Routing.

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T-SQL Query- Search for Column Details by Name

By Brian Wineland on Jan 12

Oftentimes, I am presented with queries from a client with a myriad of joins that have no table aliases. In order to improve performance, I often will have to create temporary tables from pieces of the query, and sometimes they need to be created manually as opposed to performing a SELECT INTO.  Having to search through all of the tables through the GUI manually to determine the proper information on the columns can be quite a pain and a waste of time.  In an effort to better utilize my time, I created a simple query that will return where the column resides as well as everything you need to know about the column and more.

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SQL Server Reporting Services- Adding SSRS to SQL Server Clustered Instance

By Corey Beck on Dec 29

I recently was tasked with a project to consolidate several SQL 2005 database servers down to one existing SQL 2012 database cluster.  While working on this project, I found that one of the database servers needing to be consolidated was utilizing SQL Server Reporting Services (SSRS), but the existing cluster was not configured for Reporting Services.  SSRS is not cluster aware, so adding this feature to an existing clustered instance is not straightforward and will likely lead to a rule check failure on the “Existing clustered or cluster-prepared instance” rule.  Well today is your lucky day, as I’m going to show you exactly how to get beyond this error and on your way to making your SSRS cluster aware!

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SQL Server Enterprise Features – Data Compression

By Corey Beck on Dec 14

In the world of big data, we are always trying to lighten our storage footprint.  Luckily for us, Microsoft has introduced data compression as an enterprise-level feature to aid in conserving storage.  Not only are you able to save on storage, you will also dramatically reduce the number of I/O requests.  Knowing that the disk subsystem is the slowest part of our environments, these fewer I/O requests needed for retrieving data will lead to an increase in performance. 

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Part 1: MDX Code Development for Beginners

By Dan King on Nov 19

As business intelligence continues to make a big splash into businesses, SSAS and cubes are becoming a requirement. One of the limitations that DBAs face every day is converting from reading and writing T-SQL statements to being able to read and write MDX with ease. In order help others who may have been thrown into the role, I am going to start a series on MDX code writing.  This blog post will be geared towards translating a simple T-SQL SELECT statement into an MDX SELECT statement.

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SQL Server- Use Database Snapshots for Code Deploys to Recover a Single Table or Entire Database

By Tim Liput on Nov 10

I have found that database snapshots are under-utilized and wanted to show an example of how efficient it is to use them prior to a code deploy for the purpose of recovering a single table or reverting an entire database from a snapshot in the event of unexpected functionality within an application.

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How to Slipstream SQL Server Install

By John Handra on Oct 22

If you cannot install SQL Server 2008 because of the known issue in the Setup program, you will have to use the slipstream method to successfully complete an installation of SQL Server. This method involves downloading the service pack package that you want for your architecture and combining that with the original SQL Server 2008 install media.

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Creating SSAS Hierarchies with Multiple Dimension Tables

By Dan King on Oct 13

Recently, I was tasked with building a hierarchy using multiple dimensions. I was advised to use a named query or materialized view to accomplish this because SSAS doesn’t have the capabilities to read the columns/attributes from multiple dimensions. Since I have done this before, I decided to take the AdventureWorks database and give a step-by-step tutorial of how to accomplish this request. Let’s get started!

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SQL Server: CMDEXEC Subsystem Failed to Load

By John Handra on Oct 07

During your life as a DBA, you will probably have to restore the master database and all the user databases on a new operating system to bring an already existing SQL Server instance online. One of my clients recently had an issue with hardware failure. Our only option was to install SQL Server on a new OS and use the backup files to restore all the databases from the old SQL Server instance. Once the new system was completely built and we restored msdb, we noticed that some of the SQL Server Agent jobs began to fail. Below is the error output from the job history. It states that the CMDEXEC subsystem failed to load.

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Avoid Visible Attribute Hierarchies for Attributes Used as Levels in User-Defined Hierarchies

By Dan King on Sep 22

Have you ever built a dimension in SSAS and received a blue informational warning advising you to:

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SQL Server- Move a Clustered Primary Key Index to a New Filegroup

By Tim Liput on Sep 08

In effort to clean up database environments, we as DBAs are often asked to either move tables to a different file group or to consolidate multiple filegroups and the number of database files into one. The recommended way of accomplishing this task is to drop and create a clustered index on the new filegroup; however, whenever the clustered index is also a primary key, this process becomes very inefficient and resource-intensive since we have to drop all of the foreign keys, the clustered primary key, and then recreate the clustered primary key and all of its dependencies.

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SQL Server Performance Tuning- Eliminating Key Lookups

By Corey Beck on Sep 01

Recently, I had reports from one of my clients that many of their users were experiencing slowness. While investigating, I found the root cause to be a key lookup on a single function execution, completely unrelated to the activities being performed by the users. A key lookup can be a costly operation that requires additional I/O and ultimately negatively impacts performance. As we all know, the disk subsystem is the slowest part of our environments, so eliminating key lookups when you can and decreasing the amount of I/O will have a positive impact on performance.

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SQL Server Job- Invalid Job Owner

By John Handra on Aug 25

Did you ever have one of those déjà vu moments when you are working in SQL Server and you swore you already addressed an issue? This has happened to all of us, and working in SQL Server every day, I’ve certainly had my fair share of SQL déjà vu.

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