An adventure on SQL Server performance and features

CategoryTips&Tricks

Get faster performance and lower network usage in SQL Server Loops by avoiding the “DONE Token” overload

G

FYI: You can get the Notebook for this article on my github and experiment yourself (opens with Azure Data Studio). Preamble Everybody knows that using loops in SQL Server is not efficient, if you’re able to write that same logic in a set-based statement it’s guaranteed to be faster.Still, devs can’t be helped, you just can’t seem to nail down the set-equivalent statement...

How to identify the unit of measure of Extended Events durations

H

Even if I use Extended Events almost every day, I always forget the unit of measure of each duration counter, since they’re basically arbitrary; Seconds, milliseconds, microseconds? Whatever, it depends on the dev that implemented that specific counter. That’s why I’ve added to Tsql.tech Github repository the following code that extracts the descriptions from XE DMVs in order to...

Quickly move data between instances for testing using only PowerShell

Q

Quick tip, how many times did a dev ask you to move the PROD/QA data to DEV to test a feature? Of course, not the whole DB, which would be too easy via a scripted backup/restore, but only a single table, or subset of table data? How do you deal with it usually? With the SSMS Import data Wizard? (ugh..) Exporting to flat file and reimporting? Linked Servers? External tools? Restore the whole...

Cast any string directly to XML with auto-escaping characters in SQL Server

C

Recently I had to look up the definition for a bunch of SQL objects and didn’t want to manually retrieve them manually in SSMS (with Create Scripts) or Visual Studio (by searching the object name in my TFS repository). Since lazyness and automation are the basis of a well done engineering work, I wanted to create a list, where I could basically click on the object that I needed and see the...

How to Show Better Execution Plans in Azure Data Studio

H

Azure Data Studio is starting to mature and some neat features are coming to the vscode-based (and now multidatabase and multiplatform) tool. We got query plans in the app since some time, but to be frank they’re not very pretty and have some issues with dark themes: Phantom Lines in plans with Dark Theme The new way Phil Scott built the Queryplan.show extension for Azure Data Studio, which...

Load data directly in SQL Server from a xlsx file, without OLEDB or Excel, using Powershell

L

I don’t know you, but people from other BU are old fashioned guys that do everything by hand, and then send you an Excel file to “put this data in the database” or “find info related to this codes”. This is an hassle, especially if you don’t have the Microsoft.ACE.OLEDB provider installed in your machine (or for some reason SSMS doesn’t recognize it or...

Why identity values can jump by the 1000’s ? Is it normal?

W

It must have happened you at least once to find identity columns with values that from one row to the next one jump by 1000’s rows, of course without having anyone deleting the rows in between, how this occurs? Identity columns don’t actually recalculate every time the next number to be inserted, SQL Server caches a number of values in order to obtain faster inserts and polls from...

A quick function to remove (or keep only) string patterns from SQL Server Strings

A

Working with strings in SQL Server isn’t as easy or powerful as using any programming language, but, I’m sure that more than once you had to to some data manipulation directly in the database, this may help you out, and it doesn’t use Loops, CLR or XML The idea is to exploit set logic, as opposed to the classic program logic of when you’re usually playing with strings in...

How to populate a PowerBI Dataset from a REST API, using PowerBI’s REST API, without any code (via Microsoft Flow)

H

I was wondering if PowerBI could be used for reporting on Live data, not coming from my Database using DirectQuery (or the new super neat composite mode) with with a Streaming Dataset, which I never used before, so, I got to work. The Proof Of Concept is to take live data from Cryptocurrency value using REST API and pushing them into a PowerBI report.I’m using the API from...

SQL Server: How to Find a safe restore point (and who messed up) by reading from the Transaction Log

S

Panic: Someone has messed up and deleted a super important piece of information in a table! Who did it? Nobody knows. When did it happen? “The data was there this morning” Super useful info, thanks brah. So you activate your DBA Magic Powers¬© and try to deal with this stuff yourself: you need to identify which is the exact point where the data has been deleted (in order to minimize...

An adventure on SQL Server performance and features

Emanuele Meazzo

My Social Profiles

If you're interested in following me around in the social world, here are some URLs for you