column_compression_zlib_strategy

In 10.6 ES, 10.6 CS, 10.5 ES, 10.5 CS, 10.4 ES, 10.4 CS, 10.3 ES, 10.3 CS:

The strategy parameter is used to tune the compression algorithm. Use the value DEFAULT_STRATEGY for normal data, FILTERED for data produced by a filter (or predictor), HUFFMAN_ONLY to force Huffman encoding only (no string match), or RLE to limit match distances to one (run-length encoding). Filtered data consists mostly of small values with a somewhat random distribution. In this case, the compression algorithm is tuned to compress them better. The effect of FILTERED is to force more Huffman coding and less string matching; it is somewhat intermediate between DEFAULT_STRATEGY and HUFFMAN_ONLY. RLE is designed to be almost as fast as HUFFMAN_ONLY, but give better compression for PNG image data. The strategy parameter only affects the compression ratio but not the correctness of the compressed output even if it is not set appropriately. FIXED prevents the use of dynamic Huffman codes, allowing for a simpler decoder for special applications.

In 10.2 ES, 10.2 CS:

Not present

See also: System Variables for MariaDB Enterprise Server 10.6, in 10.6 CS, in 10.5 ES, in 10.5 CS, in 10.4 ES, in 10.4 CS, in 10.3 ES, in 10.3 CS, in 10.2 ES, and in 10.2 CS

DETAILS

PARAMETERS

Command-line

--column_compression_zlib_strategy={DEFAULT_STRATEGY|FILTERED|HUFFMAN_ONLY|RLE|FIXED}

Configuration file

Supported

Dynamic

Yes

Scope

Global, Session

Data Type

ENUM (DEFAULT_STRATEGY, FILTERED, HUFFMAN_ONLY, RLE, FIXED)

Default Value

DEFAULT_STRATEGY

SKYSQL

Cloud

SkySQL Topology

ES Ver

Default

AWS

HA (Primary/Replica)

10.4

DEFAULT_STRATEGY

AWS

HA (Primary/Replica)

10.5

DEFAULT_STRATEGY

AWS

Transactional Standalone

10.4

DEFAULT_STRATEGY

AWS

Transactional Standalone

10.5

DEFAULT_STRATEGY

AWS

Distributed Transactions

10.5

Not present

GCP

ColumnStore

10.5

DEFAULT_STRATEGY

GCP

ColumnStore Multi

10.5

DEFAULT_STRATEGY

GCP

Galera

10.4

DEFAULT_STRATEGY

GCP

Galera

10.5

DEFAULT_STRATEGY

GCP

HA (Primary/Replica)

10.4

DEFAULT_STRATEGY

GCP

HA (Primary/Replica)

10.5

DEFAULT_STRATEGY

GCP

HTAP

10.5

DEFAULT_STRATEGY

GCP

Transactional Standalone

10.4

DEFAULT_STRATEGY

GCP

Transactional Standalone

10.5

DEFAULT_STRATEGY

GCP

Distributed Transactions

10.5

Not present

See MariaDB SkySQL documentation to learn more about the MariaDB SkySQL database as a service.

CHANGE HISTORY

Release Series

History

10.6 Enterprise

  • Present starting in MariaDB Enterprise Server 10.6.4-1.

10.6 Community

  • Present starting in MariaDB Community Server 10.6.0.

10.5 Enterprise

  • Present starting in MariaDB Enterprise Server 10.5.3-1.

10.5 Community

  • Present starting in MariaDB Community Server 10.5.0.

10.4 Enterprise

  • Present starting in MariaDB Enterprise Server 10.4.6-1.

10.4 Community

  • Present starting in MariaDB Community Server 10.4.0.

10.3 Enterprise

  • Present starting in MariaDB Enterprise Server 10.3.16-1.

10.3 Community

  • Added in MariaDB Community Server 10.3.2.

10.2 Enterprise

  • Not present.

10.2 Community

  • Not present.

EXTERNAL REFERENCES