columnstore_select_handler

In 10.6 ES:: Set the MCS select_handler to Disabled, Enabled, or Automatic
In 10.5 ES, 10.4 ES:: Enables the ColumnStore select handler, which allows ColumnStore to plan its own queries.

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

This page is part of MariaDB's SkySQL Documentation.

The parent of this page is: System Variables for MariaDB Enterprise Server

Topics on this page:

DETAILS
- PARAMETERS
- SKYSQL
CHANGE HISTORY
EXTERNAL REFERENCES

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

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

CHANGE HISTORY

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.

EXTERNAL REFERENCES

This page shows information specific to MariaDB SkySQL. Information for non-SkySQL use can be found on the columnstore_select_handler page in the MariaDB Enterprise Documentation.