columnstore_select_handler

Overview

In 10.6 ES, 10.6 CS:

Set the MCS select_handler to Disabled, Enabled, or Automatic

In 10.5 ES, 10.5 CS, 10.4 ES:

Enables the ColumnStore select handler, which allows ColumnStore to plan its own queries.

In 10.4 CS, 10.3 ES, 10.3 CS, 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

The columnstore_select_handler system variable configures the select handler used by Enterprise ColumnStore:

Value

Description

  • AUTO

  • When set to AUTO, Enterprise ColumnStore automatically chooses the best select handler for a given SELECT query.

  • AUTO was added in Enterprise ColumnStore 6.

OFF

  • When set to OFF, Enterprise ColumnStore uses the generic select handler for all SELECT queries.

  • It is not recommended to use this value, unless recommended by MariaDB Support.

ON

  • When set to ON, Enterprise ColumnStore uses the custom select handler for all SELECT queries.

  • ON is the default in Enterprise ColumnStore 5 and Enterprise ColumnStore 6.

PARAMETERS

Command-line

--columnstore_select_handler={OFF|ON|AUTO}

Configuration file

Supported

Dynamic

Yes

Scope

Global, Session

Data Type

ENUM (OFF, ON, AUTO)

Default Value

ON

CHANGE HISTORY

Release Series

History

10.6 Enterprise

  • Present starting in MariaDB Enterprise Server 10.6.4-1.

10.6 Community

  • Removed in MariaDB Community Server 10.6.0.

  • Added in MariaDB Community Server 10.6.1.

10.5 Enterprise

  • Removed in MariaDB Enterprise Server 10.5.3-1.

  • Added in MariaDB Enterprise Server 10.5.4-2.

10.5 Community

  • Added in MariaDB Community Server 10.5.4.

10.4 Enterprise

  • Added in MariaDB Enterprise Server 10.4.11-5.

  • Removed in MariaDB Community Server 10.4.24-15.

10.4 Community

  • Not present.

10.3 Enterprise

  • Not present.

10.3 Community

  • Not present.

10.2 Enterprise

  • Not present.

10.2 Community

  • Not present.

EXTERNAL REFERENCES