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What is ANSI_PADDING and why we should use it?

Updated: Aug 16, 2023

Today, I was late for team meeting ... :(

When I joined a Teams meeting, the team discussed ANSI_PADDING. One of the teammates fires at me with the teacher's voice: "Pop-quiz! What is ANSI_PADDING? Shoot!".

That was a joke, but ... just in case, let's see what is this.


ANSI_PADDING is a setting in SQL Server. That setting controls whether or not SQL Server pads trailing spaces in columns. It's related to variable-length character and binary columns when data is inserted or updated. Columns with char, varchar, binary, and varbinary data types.


The default setting for ANSI_PADDING is ON. This means that SQL Server will pad trailing spaces in columns with these data types. Simply talking:

  • When it's ON, the engine will pad trailing spaces in these columns to the defined length of the column.

  • When it's OFF - will not pad trailing spaces in these columns.

Imagine you're organizing a picnic, and you want everyone to have a comfortable seat. You'd probably make sure there's enough space and cushions for everyone. Well, think of ANSI_PADDING as the cushions for your data. When you pad data, you're adding a bit of extra space: blanks for characters and zeros for binary data. That is to make sure everything fits just right.


Why should we use ANSI_PADDING?

There are a few reasons why you might want to use ANSI_PADDING:

  • To ensure consistent formatting of data (Data Integrity). If you want to keep data in a particular way, you can use ANSI_PADDING to ensure that you add extra spaces at the end. This can be helpful for applications that need to process data in a specific way. Let's say you have a column in your database that stores customer names. You want to make sure that all customer names are in the same format, with trailing spaces always padded. With "ON", the engine will always pad trailing spaces in this column. Regardless of whether the value being inserted has trailing spaces or not. This will ensure that all customer names are stored in the same format and can help data integrity.

  • To improve performance. In some cases, padding trailing spaces can improve performance. This is because SQL Server can easily compare strings that have extra spaces added at the end.

  • Consistency and Standardization. By enabling ANSI_PADDING, you adhere to the ANSI SQL standard. Which promotes consistent behavior and compatibility across different database platforms.

  • ANSI_DEFAULTS is ON. Well, in this case, ANSI_PADDING will not ask you. It automatically follows suit. It's like a dynamic duo working together for your data's benefit.



When should we not use ANSI_PADDING?

There are a few cases where you might not want to use ANSI_PADDING:

  • If space usage is a concern. Padding trailing spaces can waste space in the database. If you are worried about space usage, you might want to set ANSI_PADDING to OFF.

  • If you are not sure, about trailing spaces. If you are not sure that you need to pad trailing spaces, it is best to err on the side of caution and set ANSI_PADDING to OFF. This will prevent SQL Server from padding trailing spaces and can save space in the database.


Final words for today

ANSI_PADDING emerges as a key player and your ally, maintaining the integrity and consistency of data. Through this, we can ensure data efficiency, compatibility, and reliability.


Its meticulous padding of characters and binaries is more than a technical nuance. It's a strategic move to enhance data operations. Whether you're orchestrating indexes, changing views, or aiming for consistency across platforms, ANSI_PADDING stands as a steadfast tool in your arsenal.


It's the secret to your data's comfort and efficiency. So, next time you're working with SQL Server, don't forget to consider the padding. Your data will thank you for the extra cushioning!


I hope this blog post was informative and helpful! :)



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