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 TSQL and 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 TSQL and 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 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 and Recovery

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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Do you measure query IO with SET STATISTICS IO ON ?

Introduction In our tuning work and often in presentations we see people use SET STATISTICS IO ON as a handy way to measure IO, especially logical reads. But, not many people know that it skips measuring IO from certain types

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Are you still using READ COMMITTED transaction isolation level? Default transaction isolation level on all SQL Server versions (2000-2014) has serious inconsistency problems, by design. Not many people are familiar how and why is it happening. I am writing this

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