columnstore_select_handler

Overview

In 10.6 ES, 10.6 CS:

Set the MCS select_handler to Disabled, Enabled, or Automatic

In 10.6 ES:

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 10.5 ES, 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

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

Multi-Node Analytics

10.6

ON

Single Node Analytics

10.6

ON

Distributed Transactions

10.5

Not present

10.6

Not present

Replicated Transactions

10.4

Not present

10.5

Not present

10.6

Not present

Single Node Transactions

10.4

Not present

10.5

Not present

10.6

Not present

GCP

Multi-Node Analytics

10.6

ON

Single Node Analytics

10.6

ON

Distributed Transactions

10.5

Not present

10.6

Not present

Replicated Transactions

10.4

Not present

10.5

Not present

10.6

Not present

Single Node Transactions

10.4

Not present

10.5

Not present

10.6

Not present

Cloud

SkySQL Topology

ES Ver

Default

AWS

ColumnStore Data Warehouse

10.6

ON

Xpand Distributed SQL

10.5

Not present

10.6

Not present

Enterprise Server With Replica(s)

10.4

Not present

10.5

Not present

10.6

Not present

Enterprise Server Single Node

10.4

Not present

10.5

Not present

10.6

Not present

GCP

ColumnStore Data Warehouse

10.6

ON

Xpand Distributed SQL

10.5

Not present

10.6

Not present

Enterprise Server With Replica(s)

10.4

Not present

10.5

Not present

10.6

Not present

Enterprise Server Single Node

10.4

Not present

10.5

Not present

10.6

Not present

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 Enterprise 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.

Release Series

History

10.6 Enterprise

  • Present starting in MariaDB Enterprise Server 10.6.4-1.

10.5 Enterprise

  • Removed in MariaDB Enterprise Server 10.5.3-1.

  • Added in MariaDB Enterprise Server 10.5.4-2.

10.4 Enterprise

  • Added in MariaDB Enterprise Server 10.4.11-5.

  • Removed in MariaDB Enterprise Server 10.4.24-15.