Data compression sql server

  • Can we compress data in SQL Server?

    There are three forms of data compression you can use with SQL Server: row-level compression, unicode compression, and page-level compression.
    To learn more about heaps, see Heaps (Tables without Clustered Indexes) in the MSDN library..

  • Row compression is defined here.
    The simple explanation is that it take fixed-length columns and makes them variable length, adding additional bytes for the overhead of tracking the changes being made.
    The link provided has a table that references the savings for the datatypes used.
    It's interesting reading.

Is there a risk of plan regression when using data compression in SQL Server?

This can lead to reduced I/O and better performance.
However, it can also result in additional CPU usage in some cases, outweighing the benefits of data compression.
SQL Server query optimizer does not cost the overhead of expanding the compressed data, which can lead to plan regression as shown in the video.

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What are the benefits of using data compression in SQL Server?

In addition to saving space, data compression can help improve performance of I/O intensive workloads because the data is stored in fewer pages and queries need to read fewer pages from disk.
However, extra CPU resources are required on the database server to compress and decompress the data, while data is exchanged with the application.

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What is the sp_estimate_data_compression_savings command in SQL Server?

The sys.sp_estimate_data_compression_savings system stored procedure is available in Azure SQL Database and Azure SQL Managed Instance.
To estimate the size of the object if it were to use the requested compression setting, this stored procedure samples the source object and loads this data into an equivalent table and index created in tempdb.

How does row compression affect SQL Server & Azure SQL database?

NULL and 0 values across all data types are optimized and take no bytes

The following table describes how row compression affects the existing types in SQL Server and Azure SQL Database

The table doesn't include the savings that can be achieved by using page compression

Is storage affected? 1 byte is the minimum storage needed

Here are detailed steps to implement data compression using sqlcmd:

  1. Launch the Command Prompt: To open the command prompt, click on the Start button, type cmd in the search box, and press Enter.
  2. Connect to your SQL Server instance with sqlcmd: Run the following command to connect to your SQL Server. ...
  3. Implement Row Compression: To apply row compression on a table, use the following command. ...
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