optimizer_use_condition_selectivity

Overview

Controls selectivity of which conditions the optimizer takes into account to calculate cardinality of a partial join when it searches for the best execution plan Meaning: 1 - use selectivity of index backed range conditions to calculate the cardinality of a partial join if the last joined table is accessed by full table scan or an index scan, 2 - use selectivity of index backed range conditions to calculate the cardinality of a partial join in any case, 3 - additionally always use selectivity of range conditions that are not backed by any index to calculate the cardinality of a partial join, 4 - use histograms to calculate selectivity of range conditions that are not backed by any index to calculate the cardinality of a partial join.5 - additionally use selectivity of certain non-range predicates calculated on record samples

DETAILS

PARAMETERS

Command-line

--optimizer_use_condition_selectivity=#

Configuration file

Supported

Dynamic

Yes

Scope

Global, Session

Data Type

BIGINT UNSIGNED

Minimum Value

1

Maximum Value

5

Default Value

4

SKYSQL

Cloud

SkySQL Topology

ES Ver

Default

AWS

Multi-Node Analytics

10.6

4

Single Node Analytics

10.6

4

Distributed Transactions

10.5

Not present

10.6

Not present

Replicated Transactions

10.4

4

10.5

4

10.6

4

Single Node Transactions

10.4

4

10.5

4

10.6

4

GCP

Multi-Node Analytics

10.6

4

Single Node Analytics

10.6

4

Distributed Transactions

10.5

Not present

10.6

Not present

Replicated Transactions

10.4

4

10.5

4

10.6

4

Single Node Transactions

10.4

4

10.5

4

10.6

4

Cloud

SkySQL Topology

ES Ver

Default

AWS

ColumnStore Data Warehouse

10.6

4

Xpand Distributed SQL

10.5

Not present

10.6

Not present

Enterprise Server With Replica(s)

10.4

4

10.5

4

10.6

4

Enterprise Server Single Node

10.4

4

10.5

4

10.6

4

GCP

ColumnStore Data Warehouse

10.6

4

Xpand Distributed SQL

10.5

Not present

10.6

Not present

Enterprise Server With Replica(s)

10.4

4

10.5

4

10.6

4

Enterprise Server Single Node

10.4

4

10.5

4

10.6

4

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.

  • Default value changed in MariaDB Community Server 10.4.1 from 1 to 4

10.3 Enterprise

  • Present starting in MariaDB Enterprise Server 10.3.16-1.

10.3 Community

  • Present starting in MariaDB Community Server 10.3.0.

10.2 Enterprise

  • Present starting in MariaDB Enterprise Server 10.2.25-1.

10.2 Community

  • Present starting in MariaDB Community Server 10.2.0.

Release Series

History

10.6 Enterprise

  • Present starting in MariaDB Enterprise Server 10.6.4-1.

10.5 Enterprise

  • Present starting in MariaDB Enterprise Server 10.5.3-1.

10.4 Enterprise

  • Present starting in MariaDB Enterprise Server 10.4.6-1.

EXTERNAL REFERENCES