Database compression algorithms

  • Best lossless compression algorithms

    To compress an index, expand the table that contains the index that you want to compress and then expand the Indexes folder.
    Right-click the table or index to compress, point to Storage and select Manage Compression.
    In the Data Compression Wizard, on the Welcome to the Data Compression Wizard page, select Next..

  • How does database compression work?

    Database compression is a set of techniques that reorganizes database content to save on physical storage space and improve performance speeds.
    Compression can be achieved in two primary ways: Lossless: Original data can be fully reconstructed from the compressed data.Mar 28, 2019.

  • What is database compression?

    Database compression is a set of techniques that reorganizes database content to save on physical storage space and improve performance speeds.
    Compression can be achieved in two primary ways: Lossless: Original data can be fully reconstructed from the compressed data.Mar 28, 2019.

How Data Compression Algorithms Works
  1. Lossless compression: Lossless compression algorithms aim to reduce the size of data without any loss of information.
  2. Lossy compression: Lossy compression algorithms sacrifice some amount of data in order to achieve higher compression ratios.
The Lempel–Ziv (LZ) compression methods are among the most popular algorithms for lossless storage. DEFLATE is a variation on LZ optimized for decompression  LosslessLossyTheoryUses

Is there a universal data compression algorithm?

An universal data compression algorithm is also proposed in (Rissanen, 1983), which has the capability to compress long strings created by a “finitely generated” source, with near optimum per symbol length without any knowledge of the source.

How to avoid lossy compression in a database?

Databases avoid lossy compression at the backend

However, applications might accept a lower quality using lossy techniques, especially for images, audio, videos

Among lossless techniques, all compressed data is stored in binary

Run-Length Encoding is the simplest

What is advanced compression in Oracle Database 11g?

Each of these Advanced Compression capabilities is described in this document

Oracle Database 11g Release 1 introduced OLTP Table Compression, now called Advanced Row Compression, which maintains compression during all types of data manipulation operations, including conventional DML such as INSERT and UPDATE

Popular Compression Algorithms

  • Run-Length Encoding (RLE) Run-Length Encoding is a lossless compression technique which scans data sequentially for repetitive value and its occurrence then encodes to a sequence of value and its count. ...
  • Prefix Encoding This algorithm also removes redundant data but its rather difficult to implement. ...
  • Dictionary Compression Dictionary compression algorithms replace long strings with shorter codewords. ...

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