External Article

Index Scans and Table Scans

There are several things that you can do to improve performance by throwing more hardware at the problem, but usually the place you get the most benefit from is when you tune your queries. One common problem that exists is the lack of indexes or incorrect indexes and therefore SQL Server has to process more data to find the records that meet the queries criteria. These issues are known as Index Scans and Table Scans.

External Article

Purging Data from a Large Table in SQL Server

Purging data from a table is a common database maintenance task to prevent it from growing too large or to stay in compliance with data retention. When dealing with small amounts of data, this can be accomplished by a simple delete with no issues; however, with larger tables, this task can be problematic. Deleting records requires a lock that can block other processes from writing or even reading the data (depending on your isolation level). In this article I will share a technique I have used to work with some very large tables.

Blogs

RANK() vs DENSE_RANK(): #SQLNewBlogger

By

I haven’t done one of these in awhile, but I saw an article recently...

Using CAT for Testing of Data Agents

By

In last months one of the scenarios where you can use AI has been...

Are you getting value from your reporting?

By

Do you spend so long manipulating your data into something vaguely useful that you...

Read the latest Blogs

Forums

Fun with JSON

By ateraa

Comments posted to this topic are about the item Fun with JSON

Creating JSON II

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Creating JSON II

Engineer Lessons

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Engineer Lessons

Visit the forum

Question of the Day

Creating JSON II

On SQL Server 2025, what happens when I run this code: 

SELECT JSON_OBJECTAGG( N'City':N'Denver' RETURNING JSON)
GO

See possible answers