Let’s say your company relies on the cloud for its servers (or maybe not, on premise networks have more options but they still have their limits). Performance is important so you’ve tuned every query, you’ve tested and adjusted each of the server settings. The cloud gives you limited control over… Read more
Fair warning, this is a discussion piece. I had a task, I went through several possibilities and I’m going to share each of them and the results of those I tried. I will not be giving any specific examples or code. Feel free to give me your opinion in the… Read more
It’s Chris Yates (b/t) birthday! (I think he just tured 19.) And in honor of his birthday we are writing blog posts! Well, technically it’s T-SQL Tuesday again, but we can pretend we are writing for Chris’ birthday. In fact that’s the subject he’s selected. “Give… Read more
I submitted two sessions. One I’d given before (including at Summit 2015), and… Read more
Foreign keys are a classic method of enforcing RI (Referential Integrity). Unfortunately though, they can get in the way if you have to reload data in a table. Lets say developers would like you to overwrite the data from several tables in the test environment with data from the… Read more
Like many other programming languages T-SQL uses parentheses () for a number of tasks. To help determine precedence, function calls etc. Now it’s nothing like LISP but with enough in one statement it can still get confusing at times.
Here is a fairly… Read more
This feature is Enterprise only which can limit who it is useful to, but I find the whole concept fascinating. In particular the way it works.
The cloud can be expensive. I had this hammered home the other day by a simple mistake. I’m currently working with Microsoft’s Azure platform and using one of the free credit options. I get a free $25 a month for a year and fortunately for me this put a… Read more
Help! I backed up my database yesterday and the backup file was about 200MB but today it’s closer to 400! What happened?
This month my friend Michael J Swart(b/t) would like us to talk about the new 2016 version of SQL Server. The feature I want to talk about has been around for a bit. Not because it’s not part of SQL 2016 but because it’s part of… Read more
I did a post the other day on comparing two tables. It was meant as a general overview but I got a fair number of comments and requests for more specifics. So here we go.
I had one comment that TABLEDIFF uses REBAR functionality. So let’s try an…
Many years ago during an interview I was asked to “Name the top 7 DBCC commands that you use.” I think I was able to name 3. Ever since then I’ve paid particular attention to DBCC commands in preparation of the day when I hear that question again. Well not… Read more
I was reading someone’s question the other day on StackExchange and while the existing comments/questions solved the OP’s (original poster) problem they didn’t really answer the question. I was pretty sure I understood what was going on so I decided to throw my own answer into the ring. In the… Read more
I really do. There is a joke that DBAs say no to everything and there is some truth to that. But if I say No it’s for a reason. A good one. Because I hate disappointing people, and I hate making their work harder. But I promise I have a… Read more
Recently I created my first Azure SQL Database. But now I need to connect to it.
There is a highly useful system view called sys.master_files. If you’ve never encountered it before it returns a list of all files from all databases. It’s been somewhat frustrating to me that there is no similar master_objects, master_tables, master_indexes etc. So what does a dev/dba do? Create them! So… Read more
Starting with Randolph’s definition of a best practice (he got it from Wikipedia and it’s more than good enough)
A best practice is a method or…
Let’s start with a very brief definition of some RAID levels.
- RAID 0 : Stripe your data across multiple disks. Writing a portion of the data to each disk. This improves performance but increases the risk of corruption.
- RAID 1 : Mirror your data across multiple disks. This duplicates…
I’ve been working on tuning a query for the last week and I’ve had to make several changes to the query’s logic. I’m always a little nervous when making those types of changes so I try to do some careful testing before I even suggest the changes to the developers.… Read more