SQL Server Articles, Tips and Tricks
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 …
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 …
Checkpoint and Lazy Writer are somewhat similar: they both write pages from buffer pool memory to the disk. So, what is the difference?
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 …
Transaction Log Backups – How long to keep them? Read more »
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 …
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 …
Do you measure query IO with SET STATISTICS IO ON ? Read more »
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 …
Introduction We either have or will experience a drive failure. Doesn’t matter if we talk about HDD, SSD, or PCIe disks, any storage disk drive will fail eventually. But how probable it really is, especially if we have many drives? …
Disk failure probability on a large number of disks Read more »
There are some myths widely spread about transaction log that are to be debunked here: Log backup copies log file FALSE. Someone might think if you have 100GB log, that log backup will also be 100GB, since they think the …
Sometimes we need a low-privileged user to do a specific administration task or task that require some server-level permissions (such as VIEW SERVER STATE, ALTER TRACE etc). Of course, we do not want to give that account server-level privilege, because …
