DF034: A variable-size datatype of very small length is used.

Last modified: May 28, 2025

The topic describes the DF034 T-SQL code analysis rule.

Category

BEST PRACTICE

Message

A variable-size datatype of very small length is used.

Description

It is not recommended to use variable-length data types with sizes less than 3 symbols.

Additional information

Using such small sizes may lead to inefficiencies in storage and processing, as variable-length data types are optimized for larger data sizes. Additionally, using very small sizes may not provide enough flexibility for storing meaningful data and could potentially lead to truncation or data loss if the data exceeds the specified size.

Noncompliant code example

DECLARE @v VARCHAR(1)

Compliant solution

DECLARE @v VARCHAR(30)