Availability Groups And Failover Cluster Instances

Derik Hammer digs into a more complex architecture for HA+DR:

The Availability Group will handle the data synchronization between the data centers. Asynchronous mode is recommend due to potential network latency hindering primary site performance. With the combination of these two features, you meet HA with the FCI’s automatic failover locally and DR with manual failover of the Availability Group between sites.

Derik’s conclusion is important:  this isn’t the type of thing a brand new accidental DBA should try to build; there are a lot of moving parts here.  But if you want a robust solution and have the support people available to handle the relative complexity, this is a good option.

SQL Server Express Images In Azure

Kevin Feasel

2016-02-12

Cloud

Microsoft now offers an Azure image for SQL Server Express:

We just announced that we added images for SQL Server Express with Tools 2014, 2012, and 2008R2 in the Azure Gallery. SQL Server Express is a free version of SQL Server that you can use for dev/test and for web and mobile apps with lightweight relational database needs.

I’m not the world’s biggest fan of Express edition, but if you’re cost-conscious enough, this might be a nice move for you.

Read-Only AG Routing

John Handra shows how to configure read-only routing on an Availability Group:

NOTE: SQL Server 2016 introduces load-balancing across the secondary replicas in your AlwaysOn Availability Group. To utilize this feature, the above routing list will need to be modified so that SQL Server directs incoming read-only connections across the servers you choose to be load-balanced. You will have to use nested parentheses around the server instances you want to be part of the load-balanced group.

Read-only routing requires some additional setup and possibly load changes, but it can give you a nice performance gain by off-loading some of your read requests.

Widening Indexed Identity Columns

Aaron Bertrand shows what happens when you try to widen an identity integer column associated with an index or computed column:

Summary: We will need to drop and re-create any indexes, clustered or not, that reference the IDENTITY column – in the key or the INCLUDE. If the IDENTITY column is part of the clustered index, this means all indexes, since they will all reference the clustering key by definition. And disabling them isn’t enough.

Getting column sizes right at the beginning is your best bet.  Stay tuned for other alternatives.

Shot Charts

Jason Thomas shows us how to create an NBA-style shot chart using Power BI:

My entry is an analysis of the first 35 games played by Stephen Curry from the Golden State Warriors in NBA. The main feature of the entry is a Shot chart which shows the position from which he attempted his shots and the color denotes whether he made or missed it.

Jason also asks you to vote on his contest entry if you think it’s good.

JDFI

Sometimes, Michael J. Swart says, it’s better to just do it:

Okay, this is getting out of hand. The query shouldn’t have to be this complicated.
Luckily I work with a guy named Chris. He’s amazing at what he does. He questions everything without being a nitpicker (there’s a difference). He read through the Mythbusters post and followed all the links in the comments. He asked whether gbn’s JFDI pattern wasn’t better here. So I implemented it just to see what that looked like:

I’ve ended up doing the same thing in a similar scenario.  But as Aaron Bertrand notes in the comments, test your results because performance could end up being even worse than before.

Exfiltrating Data In TDE-Protected Databases

Tom LaRock shows how to exfiltrate data in a database protected by Transparent Data Encryption:

Enabling TDE does not protect your BACPAC files, just your database backups. If you are relying on TDE to protect your data at rest then allowing users to create BACPAC files will put you at risk. But no more risk than any other user choosing to run a SELECT statement and save the data somewhere (or perhapsjust use PowerBI to open a connection and import to Excel).

TDE has a single, specific purpose.  If you want something more stringent, SQL Server 2016 Always Encrypted might be an option.

Simple Recovery Mode And Transaction Logs

Kenneth Fisher discusses changing your database’s recovery model to Simple in order to clean out a transaction log:

Clearing out a full transaction log is a common problem. A quick search will find you dozens of forum entries and blog posts. Because of that I’m not going to talk about the correct methods of dealing with a transaction log full error. What I want to discuss is why you shouldn’t use the following method.

And Kenneth also hits the one legitimate use:  dire emergency.  If this is a normal part of some process (e.g., warehouse loading), bite the bullet and either live in Simple recovery mode (understanding the risks) or get the disk space to keep it in Full mode.  Switching back and forth—especially if you aren’t taking full backups immediately after switching back—is a good way to get yourself burned.

Custom SSAS Assemblies

Jens Vestergaard shows us custom assemblies in SSAS:

The example in this post will be the well known Hello World example in the context of SSAS, and I trust this will illustrate the possibilities with this technique well enough, for you to apply your own solution, to your challenges.

If you’re at all familiar with CLR in the database engine, this looks to be the Analysis Services equivalent.  Hopefully it doesn’t have the same “We can’t possibly use this!” taboo that CLR seems to have in the database engine world.

Cached Times

Tara Kizer sees a difference between the stored procedure cached time and an individual SQL statement’s cached time:

The app’s plan was cached the day before. But wait a second! My assumption was that it had recompiled this morning due to the updated stats.

Also check out Aaron Morelli’s link to an older blog post on how the plan cache works.

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November 2017
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