optimizer_use_condition_selectivity

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DETAILS
EXTERNAL REFERENCES

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

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	HA (Primary/Replica)	10.4	4
AWS	HA (Primary/Replica)	10.5	4
AWS	Transactional Standalone	10.4	4
AWS	Transactional Standalone	10.5	4
AWS	Distributed Transactions	10.5	4
GCP	ColumnStore	10.5	4
GCP	ColumnStore Multi	10.5	4
GCP	Galera	10.4	4
GCP	Galera	10.5	4
GCP	HA (Primary/Replica)	10.4	4
GCP	HA (Primary/Replica)	10.5	4
GCP	HTAP	10.5	4
GCP	Transactional Standalone	10.4	4
GCP	Transactional Standalone	10.5	4
GCP	Distributed Transactions	10.5	4

CHANGE HISTORY

Release Series	History
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

Additional information on this topic may be found in the MariaDB Public Knowledge Base.
This page shows information specific to MariaDB SkySQL. Information for non-SkySQL use can be found on the optimizer_use_condition_selectivity page in the MariaDB Enterprise Documentation.