arithmetic expression

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Optimize Your SQL by Reformulating the Spec

  • Article

As SQL developers, we tend to think of performance tuning in terms of crafting the best table indices, avoiding scalar and table valued functions, and analyzing query plans (among other things). But sometimes going back to the spec and applying some properties of elementary math can be the best way to begin to improve performance of SQL queries which implement mathematical formulas. This article is a case study of how I used this technique to optimize my SQL implementation of the Inverse Simpson Index.

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2021-05-07 (first published: )

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Question of the Day

Default Objects in Clones

On SQL Server 2022, I do this:

USE model
GO
CREATE TABLE dbo.DBALog
(logdate DATETIME2(3), logmsg VARCHAR(2000))
GO
I then create a new database:
CREATE DATABASE INVENTORY
GO
I install a new database application in here with multiple tables, views, etc. I do not run any queries. I then decide to run this code:
DBCC CLONEDATABASE(INVENTORY, Inventory_clone);
GO
What happens?

See possible answers