Data_compression desc

How to use compress in SQL?
To change the compression settings for both tables and indexes using the Data Compression wizard, perform the following steps:
1. Start SQL Server Management Studio
2. Right-click the table or index you want to compress, click Storage, and click Manage Compression
3. Click Next
4. Choose the type of compression
What is text compression explain?
Text Compression involves changing the representation of a file so that the (binary) compressed output takes less space to store, or less time to transmit, but still the original file can be reconstructed exactly from its compressed representation..
Data Compression and Archiving
1zlib — Compression compatible with gzip.2gzip — Support for gzip files.
Examples of usage. 3bz2 — Support for bzip2 compression. (De)compression of files. 4lzma — Compression using the LZMA algorithm. 5zipfile — Work with ZIP archives. 6tarfile — Read and write tar archive files.
In this article
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._{Oct 27, 2023}

Oct 27, 2023For rowstore tables and indexes, use the data compression feature to help reduce the size of the database. In addition to saving space, data Row and page compression Columnstore and columnstore

In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy.

How do I remove archival compression in SQL Server?

To remove archival compression and restore the data to columnstore compression, use ALTER TABLE (Transact-SQL) or ALTER INDEX (Transact-SQL) with the REBUILD option and DATA COMPRESSION = COLUMNSTORE.
This next example sets the data compression to columnstore on some partitions, and to columnstore archival on other partitions.

When can a table be enabled for compression?

A table can't be enabled for compression when the maximum row size plus the compression overhead exceeds the maximum row size of 8060 bytes.
For example, a table that has the columns c1 CHAR (8000) and c2 CHAR (53) can't be compressed because of the additional compression overhead.

Overview

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL Endpoint in

Permissions

Requires membership in the public role. For more information, see Metadata Visibility Configuration

Examples

Determine space used by object and show related partition information The following query returns all the object in a database

How can compression reduce the on-disk footprint in SQL Server?

Modern compression algorithms can reduce the on-disk footprint by 40-60% or even more, depending on the type of data

Compressing your SQL Server data is a simple way to cram more into your limited disk space

In this article, I’ll start off by showing you how you can find out what tables and indexes are not compressed

In SQL Server, you can query the sys.partitions system catalog view to find out whether or not a partition has been compressed. In particular, the data_compression column tells you whether it’s compressed or not. The data_compression_desc column tells you what type of compression it uses. If it isn’t compressed, it returns NONE.

Data_compression desc

How to use compress in SQL?

To change the compression settings for both tables and indexes using the Data Compression wizard, perform the following steps:

What is text compression explain?

Data Compression and Archiving