Press "Enter" to skip to content

Curated SQL Posts

Keep Scripts Up To Date

Published 2016-03-10 by Kevin Feasel

Andy Galbraith points out that scripts need maintained just like everything else:

The broader lesson here is to make sure you update your script libraries regularly – even if a script still runs and provides output (that is, you think it “works”) it doesn’t mean you are receiving valid data.

Although this example is about wait stats and wait types, it is applicable to a wide array of configurations and settings.  Changes like this are often version-related, but even within a version it can be decided that a particular wait type/trace flag/sp_configure setting/etc. is no longer important and can be ignored – or even worse, that some item is now important but wasn’t included in your original scripts!

This is an important note.  Things change over time, so our administrative scripts need to change with them.

Comments closed

Custom Power BI Visuals

Published 2016-03-10 by Kevin Feasel

Reza Rad shows us how to create a custom visualization in Power BI:

This is one of the coolest custom visuals I’ve seen so far. The reason is that this custom visual has a customization in it! with this visualization you can define regions in any picture or images, and map data points to the image in your Power BI report. The image can be everything; human body, airplane seat layout, shop floor layout or football field. You choose the image you want, then you define regions. Let’s have a closer look at this visual.

It’s amazing how easy Power BI makes that.  Almost easy enough for me to do it…

Comments closed

Are Trace Flags Dead?

Published 2016-03-10 by Kevin Feasel

Brent Ozar notes that several common trace flags are getting turned into all-grown-up commands:

SQL Server 2016 does away with these unintuitive trace flags by adding new ALTER DATABASE commands:

ALTER DATABASE SET MIXED_PAGE_ALLOCATION ON (or OFF, which is the new default behavior)

ALTER DATABASE MODIFY FILEGROUP [myfilegroup] AUTOGROW_ALL_FILES (or AUTOGROW_SINGLE_FILE, which is still the default)

I think trace flags will still be around for quite some time as a troubleshooting mechanism, but I certainly prefer clearer naming (was that trace flag 1117…or 1171…or maybe…).

Comments closed

Get SQL Server Configuration Aliases

Published 2016-03-10 by Kevin Feasel

Chris Bell shows us how to get the list of aliases set up on a server:

It is also a pain to sit and transcribe the various alias settings to be able to rebuild them all on the next machine.

There is an export list option for the aliases on your server, that’s nice and all, but there isn’t a corresponding import option.

Plus you have to deal with 32 and 64 bit lists.

The very simple script below helps since you can use to get the details of both the 32 and 64bit SQL Server aliases you have setup on your system.

Ready for it? It’s a long convoluted one:

If you use server aliases, you’ll want to check out this script.

Comments closed

SQL Server On Linux Preview

Published 2016-03-09 by Kevin Feasel

James Anderson shows us where to sign up for the SQL Server on Linux preview:

Couple of thoughts on the sign up form:

  1. Red Hat is mentioned in the announcment but this form tells us that only Ubuntu or Docker images are currently available. Will it be available to all Linux distributions? What about OS X?

  2. As for Docker, does it ever make sense to have RDBMSs in containers? Containers are generally immutable.

Done.  I’m also excited about the continued Microsoft-Red Hat collaboration, not just because I live in Red Hat territory.

In the meantime, Denny Cherry and Joey D’Antoni give their thoughts.  Here’s one of Joey’s:

My favorite part of SQL Server on Linux? My Bash scripts for automation work again.

 

Comments closed

Text Search

Published 2016-03-09 by Kevin Feasel

Anders Pedersen discusses one method he used to implement fast text search in SQL Server:

Looking into what was needed, I quickly realized there was a LOT of data, guess 50+ years of news broadcasts will do this.  Consider this was in the early 2000s, some innovation was needed from anything I had coded before.  Obviously LIKE searches was out of the question, full text search was not available.  So what to do?

Basically I decided to break down each broadcast to words into a separate table, the entire application fit in 2 tables: Story and Words.

This is a case in which thinking about the grain of data helps solve an otherwise-intractable problem.

Comments closed

Why Use Instant File Initialization?

Published 2016-03-09 by Kevin Feasel

Erin Stellato shows the benefits to using Instant File Initialization in terms of file modification and database restoration:

The time to zero out a file and write data is a function of sequential write performance on the drive(s) where the SQL Server data file(s) are located, when IFI is not enabled.  When IFI is enabled, creating or growing a data file is so fast that the time is not of significant consequence.  The time it takes to create or grow a value varies in seconds between 15K, SSD, flash, and magnetic storage when IFI is enabled.  However, if you do not enable IFI, there can be drastic differences in create, grow, and restore times depending on storage.

There’s a huge performance benefit with turning IFI on.

Comments closed