Speaking at conference Kulendayz 2015

4th of September I will hold a full-day preconference training about SQL Server 2016 performance tuning. It will be different, interesting, and hopefully funny. Real-life examples, way of thinking about the performance, and what are the ultimate limits of physical

Posted in Conferences

RCSI and LOB data – how tempdb version store is used?

Row Version Store We know RCSI (Read Committed Snapshot Isolation), as well as SI (Snapshot Isolation) use row versioning to store previous verions of rows in part of tempdb called “row version store”. If you are using default isolation level

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Page Life Expectancy and 300 sec limit

People blogged about it, including excellent Jonathan’s post here (highly recommended to read), but I will give a little more insight here. Basically, Microsoft says if PLE is below 300 seconds, we should worry about memory pressure (an old recommendation

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Speaking at SQL Saturday Budapest #sqlsatbudapest

I just returned from Sql Saturday 376 in Budapest (#sqlsatbudapest). It was really amazing. The conference room I held presentation was huge and to my pleasant surprise – fully packed! I got a lot of positive comments there, so at

Posted in Conferences

CommandTimeout – How to handle it properly – code example

Properly closing a connection to Sql Server in DotNet is more challenging than one might think. Classic code looks something like this MSDN example:

Or a mixture of “using” and “try-catch” constructs like in this nice example. But, none

Posted in Sql Client Code Tagged with: , ,

CommandTimeout – How to handle it properly?

ADO.Net Data Provider for SQL Server (System.Data.SqlClient namespace in System.Data.dll assembly) has two common classes we often use: SqlConnection and SqlCommand. SqlCommand class has CommandTimeout property (do not mix it with the ConnectionTimeout which stops long login process). But, do

Posted in Sql Client Code Tagged with: ,

Speaking at SQL Saturday Vienna conference

I am pleased that I will speak at SQL Saturday conference in Vienna, 28th of February 2015 about how to solve the “recovery impossible” situation. It is quite advanced topic, but everyone who listens will be able to save the

Posted in Conferences

CHECKPOINT vs LAZY WRITER

Checkpoint and Lazy Writer are somewhat similar: they both write pages from buffer pool memory to the disk. So, what is the difference?

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Transaction Log Backups – How long to keep them?

Introduction In this post I will give you a tip on how long it would be good to keep transaction logs. To understand why, basics of point-in-time recovery from backups are explained. If you are in a hurry: keep transaction

Posted in Transaction log

Sort records without ORDER BY?

How often you see some smartie “optimizes” the query by removing ORDER BY, justifying that query always goes by that index, and index is in desired order for the result? Or they say: “I executed this query thousands of times

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Database Consultant Vedran Kesegić M.Sc.

Database Consultant Vedran Kesegić M.Sc.

When you want:

- faster SQL Server
- more available&reliable SQL
- training for your experts

A Random Thought

Backup system databases (master, msdb, model) in addition to user databases. Without system db backup you will lose server-level objects (e.g. logins, jobs, maintenance plans...).

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