columnstore_select_handler

In 10.6 ES:

Set the MCS select_handler to Disabled, Enabled, or Automatic

In 10.6 CS:

Enable/Disable the MCS select_handler

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

SKYSQL

Cloud

SkySQL Topology

ES Ver

Default

AWS

HA (Primary/Replica)

10.4

Not present

AWS

HA (Primary/Replica)

10.5

Not present

AWS

Transactional Standalone

10.4

Not present

AWS

Transactional Standalone

10.5

Not present

AWS

Distributed Transactions

10.5

Not present

GCP

ColumnStore

10.5

ON

GCP

ColumnStore Multi

10.5

ON

GCP

Galera

10.4

Not present

GCP

Galera

10.5

Not present

GCP

HA (Primary/Replica)

10.4

Not present

GCP

HA (Primary/Replica)

10.5

Not present

GCP

HTAP

10.5

ON

GCP

Transactional Standalone

10.4

Not present

GCP

Transactional Standalone

10.5

Not present

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

  • 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.

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