30Jan 2013 by Grant Fritchey 4 Comments

Azure SQL Database Execution Plan Differences

Azure, T-SQL
I've been exploring execution plans in Azure SQL Databases a lot lately. I'm getting a presentation together for  some upcoming SQL Saturday events (first one is SQL Saturday #177, Silicon Valley). If you scroll to the bottom of this previous post, I mentioned that there were clearly differences in the optimizer because queries against empty databases were generating different plans. I've loaded up the data in my database, both SQL Server and SQL Database, so I can compare real behaviors. Doing so, I found a fun difference, even though I was running the query and generating the plan from SQL Server Management Studio. Here's the property sheet from the SELECT operator for the query run against SQL Server: And here's the property sheet from the SELECT operator for the query…
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23Jan 2013 by Grant Fritchey 2 Comments

Saving Execution Plans on Azure SQL Database

Azure
In my previous post showing how to get to execution plans in the Database Management Portal, I showed that it's pretty easy to put a query in a query window and get the execution plan. This allows you to understand query behavior in order to tune your T-SQL or your data structures, all through the Azure interface. But, what happens if you want to share an execution plan with a friend, post it to an online forum, save it for later comparisons as part of troubleshooting bad parameter sniffing, track behaviors over time as statistics change, other purposes that I can't think of at the moment? To first answer this question, let me tell you how you would do these things in SQL Server Management Studio (SSMS). First, and most…
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21Jan 2013 by Grant Fritchey 1 Comment

Pro SQL Server 2012 Practices: Chapter 12

Azure
I was very privileged to get the opportunity to write a chapter in a book with some of my friends and SQL Family, Pro SQL Server 2012 Practices . Just as each of us took a chapter to write, each of us going to take a chapter to review. But, being the greedy sort, I'm going to review two. First up, Chapter 12, "Windows Azure SQL Database for DBAs", by Herve Roggero (b|t) Personally, I love Azure. And I love Azure SQL Databases. But, I get the fear and trepidation they might cause. I also get the urge to write about them, but I never really felt like I should approach them from a book. Everything changes so much, so quickly in Azure and books just take a while to…
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16Jan 2013 by Grant Fritchey 7 Comments

You Can Say “No”

Misc
I heard about this new law that was passed to prevent employers from asking for your social media passwords. After the laughter stopped, I realized that, maybe, this would be needed. Not because I need the government to help me manage my interactions with my employers and potential employers. And not because I think the government needs to be involved in other peoples interactions, not at this level. But because I don't think people realize they have a word that they can use with employers. That word is 'No.' "We want you to sign this non-compete agreement that says you'll never be a DBA for any other company after leaving ours." Ha! No. And yes, I really had one of these. And yes, there actually are laws against it (I…
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14Jan 2013 by Grant Fritchey 9 Comments

Execution Plans on Azure SQL Database Portal

Azure
If you've been working with the Azure SQL Database portal, you know that you have a query window. Within the query window you can run queries against your server. You'll get back results, timing, everything you need to observe behavior within the system. What's that? You never heard of this? Let's figure it out real quick. Here's my portal to my Azure SQL Databases: [caption id="attachment_2296" align="alignnone" width="150"] Azure SQL Database Portal showing usage overview[/caption] Yes, all sorts of things you can do from here, but we're focused on the bottom of the screen at the Manage button. Clicking this button will open up the Management portal window, part of which you can see below: [caption id="attachment_2298" align="alignnone" width="150"] Part of the Azure SQL Management Portal showing some of what…
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09Jan 2013 by Grant Fritchey 5 Comments

Plans for 2013

Professional Development
I have lists. Lots of lists. I even have them in different locations sometimes. Some of them are carefully written down in my notebook, others are typed into OneNote and I've been experimenting with Remember the Milk and Trello (Trello is winning). These lists include ideas for presentations, blogs, articles. Notes from sessions I've attended or meetings. Lots and lots of plans and ideas and all that sort of stuff. I try to keep it organized, but sometimes it runs away from me. However, I find writing things down helps me to keep things organized. Between very carefully scheduling out my calendar and all these notes, I only occasionally completely drop the ball. One ball I dropped was coming up with some goals, some plans, for 2012. I just plowed…
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07Jan 2013 by Grant Fritchey 1 Comment

Statistics Update Clarification

T-SQL
By default statistics are created automatically within SQL Server. And, by default, these stats are updated automatically based on a set of triggers. The triggers are defined as If 0 rows - Any data added leads to a statistics update If < 500 rows - 500 rows added causes a stats update If > 500 rows - 500 rows + 20% of the number of rows causes a stats update (unless you enable a traceflag in 2012 in which case you get a proportional value instead of 20%). There are some exceptions for temporary tables and some variations for filtered statistics and filtered indexes, but you get the idea. I was writing an article on statistics in preparation for another Oracle/SQL Server discussion (on, you guessed it, statistics) and I…
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03Jan 2013 by Grant Fritchey No Comments

SQLBits Public Sessions

SQL Server
If you're over in the UK, or close to it, you've probably heard of SQL Bits even if you haven't attended. If you're across the pond here in the US or somewhere else you may have heard of SQL Bits, but few of you have gone. Well, let me tell you, from everything I've heard, this is a community event you want to find your way to. So, I'm trying. This is my first time submitting to this outstanding event and I really want to go. But, in order to make the cut, I need your help. They base who presents on community feedback. This means you go over and vote. You'll have to have a SQL Bits login, but if you're even thinking about attending you're going to have…
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