In a few days I am traveling to Iceland for the first time in life. A land of lava, ice caves and Aurora Borealis. There is a SQL Saturday conference organized by local SQL community that I am looking forward…
Author: Vedran
Collect Performance Data
Introduction Server is sometimes slow and you want to know why? Here is a lightweight diagnostic SQL kit which will give you the answer. You need to put it on your server to start logging of performance info. This solution…
Tagged with: Performance
Single-Row Deadlock
Introduction Demonstration of the smallest possible deadlock: only one statement, one table, one row. Without transactions (no BEGIN TRANSACTION). Even RCSI (Read Committed Snapshot Isolation) is turned ON to eliminate shared locks. Everything is “by the book” as Books Online…
Speaking in Switzerland!
It is SQL Server user group in Basel, after spending short time in Zürich. I am very happy to meet people there. Presentation will be very useful and interesting, and you are more than welcome to register and get there!
How to save 250 000 EUR to your customer?
Recently, for the first time in my life I had a customer from India. A far away, beautiful country I had never opportunity to visit, with 1.3 billion of people. I thought it would be interesting experience, and it was indeed.…
Speaking at Kulendayz 2017
I am honored to be selected to speak in not one but two sessions of SQL Server conference Kulendayz 2017. The topics are “Tuning optional filters” and “Mirror Killer in SQL 2016&2017 Standard Edition”. There are also other great speaks…
SQL Server 2017 announcement and quick hello from vacation
We are always thinking about you, sometimes even on vacation! Here is a quick hello video from the island of Brac:
PowerBI for SQL DBA – Investigating Perfmon Counters
Introduction PowerBI Desktop is a free tool from Microsoft you can download here. Paid versions also exist for Cloud and on premise (your servers), to easily share reports and view them on any device, not just PC. It is used…
Crypto-virus resistent backup
Introduction Crypto-viruses encrypt your data. If it asks money (a ransom) to decrypt, we call them “ransomware”. They cannot encypt your SQL Server databases because sql data and log files are in use by sqlservr.exe process, but they can encrypt…
Query with optional filters (catch-all query)
In almost every database we have a process that filters the same data with different filters. Typically, query is within a stored procedure that has many filtering parameters that are optional. The problem is – a query optimized builds only ONE plan that will handle every filter combination you throw at it.
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