[Note from Pinal]: This is a new episode of Notes from the Field series. When we build an application, we build it with zeal and enthusiasm. We believe it will do well for many years but it is not the case always. After a while performance started to go down and everything is not in the best shape. This is the time when we need to monitor performance and take action based on our analysis.
SQL SERVER – Understanding the Basics of Write Ahead Logging (WAL) Protocol
The journey for IT started way back in my college days more than a decade back. It was a booming time and it was exciting to see everyone eyeing the Computer Science stream. Almost every other person in those days always wanted to take this new trend. Riding the waves was one part of excitement, while the other was to be unique in whatever we do. It is easy to get stereotyped with someone and we can never be different from the herd. I always believed in doing the basics right – this blog project that I started more than 8 years was to bring these basic learnings back. I am glad I have been doing this. Let us learn about Write Ahead Logging.
SQL SERVER – Error while starting SQL Server logFileSize <= BlkToByteOffset ((ULONG)-1)
Recently I was playing with tempdb database in SQL Server and made some mistake. Due to that I was then not able to start SQL Service itself. Since it was an interesting problem so worth blogging about it. Let’s have a look at problem. Whenever there is a SQL startup…
Read MoreSQL SERVER – Error: Msg 4305, Level 16, State 1 – The log in this backup set terminates at LSN, which is too early to apply to the database.
While working with transaction log backup restore or log shipping, you must have seen below error message. Msg 4305, Level 16, State 1, Line 47 The log in this backup set begins at LSN 33000000048000001, which is too recent to apply to the database. An earlier log backup that includes…
Read MoreInterview Question of the Week #031 – How to do Case Sensitive SQL Query Search
Question – How to do case sensitive search on any column of the table? Answer – If Column1 of Table1 has following values ‘CaseSearch, casesearch, CASESEARCH, CaSeSeArCh’, following statement will return you all the four records. SELECT Column1 FROM Table1 WHERE Column1 = 'casesearch' To make the query case sensitive and…
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SQL SERVER – Adding File to Database in AlwaysOn Availability Group
Writing some typical interview questions have been on my list always. I look for new ways of tricking the person and most importantly, some of the interview questions are designed to make sure the person has strong fundamentals. This blog is one such attempt to understand the basics of the AlwaysOn Availability Group.
SQL SERVER – How to do IF…THEN in SQL SERVER?
Just another day I received following question – “Pinal, I am from DotNet expertise and I do not know how to convert the logic of IF…THEN into SQL statement, would you please help? ~Rajesh” I love simple questions as they have simple answers. In SQL Server, we can use a…
Read MoreSQL SERVER – A Stored Procedure for Executing SSIS Packages in the SSIS Catalog – Notes from the Field #092
[Note from Pinal]: This is a new episode of Notes from the Field series. SQL Server Integration Service (SSIS) is one of the most key essential part of the entire Business Intelligence (BI) story. It is a platform for data integration and workflow applications. In this episode of the Notes from the…
Read MoreSQL SERVER – Knowing Which Database is Consuming My Memory
I have been fortunate enough to be at conferences around the world and it is always refreshing to see how people come up with some really common yet never answered questions from time to time. The classic questions I get asked ever since I started working with databases and SQL…
Read MoreSQL SERVER – Unable to Start SQL – Error: SQL Server Could Not Spawn Lazy Writer Thread
I have a tendency to try out various settings on a typical SQL Server just to see how the behavior changes from time to time. While playing with affinity settings in SQL Server – I shot myself in the foot. It was interesting to reach how I came out of…
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