Deleting a Column: Meta-data-only operation

Microsoft’s SQL Server development team is constantly working to improve performance. One important performance optimization methodology that has been eminent in SQL Server for a long time has been making as many meta-data-only operations as…

suspect_pages

When SQL Server detects corruption in a database, it reports that corruption immediately to the client who requested the data. But did you know SQL Server also stores the details about which pages have experienced…

Msg 824, Level 24, State 2, SQL Server detected a logical consistency-based I/O error: invalid protection option

Data in SQL Server is stored in 8KB pages, both in memory and on-disk. Corruption in those pages are detected using one of several different methods, configurable at the database level. The best option, and…

Convert an LSN from Hex to Decimal

Log Sequence Numbers (LSNs) can be displayed and consumed in several formats. This post shows how to quickly and easily convert between the “typical” hexidecimal format, and the equivalent decimal format. Hexidecimal format LSNs appear…

Using DBCC PAGE to view Row Details

SQL Server stores database data on 8KB pages. The details around looking at page contents are a pretty advanced subject. However, understanding some brief details about the page structure via the output of DBCC PAGE…

CHECKPOINT and Simple Recovery Model

This article shows how checkpoint and simple recovery model works. For databases configured with the “simple” recovery model, it’s important to understand how checkpoints work1 under simple recovery model to avoid running out of log…