Azure SQL Database “Step By Step” Tutorials

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I would like to share a link to my Azure SQL Database Stairway series hosted over at SQLServerCentral.

As stated on the website a stairway guide is a series focused on a single topic and is arranged into no more than a dozen easily-navigable tutorials that we call ‘steps’. Each step is the length of a typical magazine tutorial, and emphasizes practical, hands-on learning, with just enough background theory to help you understand the topic.

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Welcome to BlobEater

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I am passionate about using Microsoft Technology to maximise business benefit. Specializing in the Data Platform – SQL server, Azure SQL DB, Azure SQL DW, elastic pools, managed instances etc.

As a great leader once said “We all need people who will give us feedback. That’s how we improve”.  So any questions/ feedback – please Get In Touch

Copyright ©  in accordance with the Copyright, Designs and Patents Act 1988. All rights reserved. You are free to use any of the content here for personal use but need permission to use it anywhere or by any means (electronic, mechanical, photocopying, recording or otherwise).

 

SQL Server I/O

Sometimes I like to see and know what SQL server is doing under certain operations and recently I wrote an extended events script to see what sort of I/O patterns my query was doing (This is a fun post). The important event here is sqlserver.file_read_completed.

I clear cache and let the fun begin.

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Azure SQL Database – Firewall Rules

If you decide to use IP addresses to control what services have access to your Azure SQL Database, then understanding firewall rules are important. Within this important area you have the ability to create firewall rules that are scoped to the database or server level as shown below.

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Microsoft Professional Program vs Microsoft Certification

When learning new technologies many people will go towards training courses (in person or online) but many also go for certifications such as MCSA / MCSE, which I no longer pursue for many reasons.

Microsoft now have this idea of Professional Programs (https://academy.microsoft.com/en-us/professional-program/) with the aim of gaining technical job-ready skills and get real-world experience through online courses, hands-on labs, and expert instruction within a 3 month class period. They offer:

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Azure SQL Database – Fixing My Scaling Failure

This is kind of a follow up from my last blog post about a scale down request issue. (https://blobeater.blog/2018/11/07/azure-sql-database-aborting-scale-request/) I was confused, so confused that I ended up logging a support request with Microsoft. The issue was I wanted to scale down a database from S1 to Basic however it would take hours for a 1GB database. Obviously something was up, but what?

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Azure SQL Database – Aborting Scale Request

Scaling up or down an Azure SQL Database is a very common task. Whilst common it is also very easy to do via the Azure portal or even PowerShell. When you scale a database please be aware that  it creates a replica of the original database at the new performance level and then switches connections over to the replica but what do you do if you want to cancel the scale request?

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Azure SQL Database – Who Changed My Auto Tuning Settings?

One of the features Microsoft wants us to use for Azure SQL Database  is Automatic Tuning. Automatic Tuning is a feature where you can think of it as entering the world of self-running and self-tuning databases.

It is said to be safe, reliable and proven using complex algorithms and built-in intelligence where it can do the following (see this link for more details: https://docs.microsoft.com/en-us/azure/sql-database/sql-database-automatic-tuning)

  1. CREATE INDEX – identifies indexes that may improve performance of your workload, creates indexes, and automatically verifies that performance of queries has improved.
  2. DROP INDEX – identifies redundant and duplicate indexes daily, except for unique indexes, and indexes that were not used for a long time (>90 days). Please note that at this time the option is not compatible with applications using partition switching and index hints.
  3. FORCE LAST GOOD PLAN – identifies SQL queries using execution plan that is slower than the previous good plan, and queries using the last known good plan instead of the regressed plan.

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Whirlwind Tour of Azure SQL Database

I have finally uploaded my Azure SQL Database presentation, apologies for the delay. I am already working on an improved version which I will be delivering next year. Here is the abstract:

Azure SQL Database is a general-purpose relational database service in Microsoft Azure. With Microsoft’s cloud-first strategy, the newest capabilities of SQL Server are released first to Azure SQL Database and then to SQL Server itself. During this entry level presentation you will get to see the differences in security, high availability, performance, and monitoring of this cloud-first solution. You will also learn about the different service tiers and performance levels that are specific to Azure SQL Database and learn about the different methods that you could use to migrate to Azure.

Link to the PowerPoint – https://blobeater.blog/presentations/

Azure SQL DB – Failed to update database because the database is read-only

Quite an interesting  situation I found myself in where I was perplexed for about 5 minutes. I was connected to an Azure SQL Database where I was configuring some users where then I executed a query and was presented with the following message:

Msg 3906, Level 16, State 2, Line 2
Failed to update database “testdb” because the database is read-only.

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