slave_parallel_mode

Controls what transactions are applied in parallel when using --slave-parallel-threads. Possible values: "optimistic" tries to apply most transactional DML in parallel, and handles any conflicts with rollback and retry. "conservative" limits parallelism in an effort to avoid any conflicts. "aggressive" tries to maximise the parallelism, possibly at the cost of increased conflict rate. "minimal" only parallelizes the commit steps of transactions. "none" disables parallel apply completely.

See also: System Variables 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

PARAMETERS

Command-line

Not Supported

Configuration file

Not Supported

Dynamic

Yes

Scope

Global

Data Type

ENUM (none, minimal, conservative, optimistic, aggressive)

Default Value

optimistic

SKYSQL

Cloud

SkySQL Topology

ES Ver

Default

AWS

HA (Primary/Replica)

10.4

conservative (choices: none, minimal, conservative, optimistic, aggressive)

AWS

HA (Primary/Replica)

10.5

conservative (choices: none, minimal, conservative, optimistic, aggressive)

AWS

Transactional Standalone

10.4

conservative (choices: none, minimal, conservative, optimistic, aggressive)

AWS

Transactional Standalone

10.5

optimistic (choices: none, minimal, conservative, optimistic, aggressive)

AWS

Distributed Transactions

10.5

conservative (choices: none, minimal, conservative, optimistic, aggressive)

GCP

ColumnStore

10.5

optimistic (choices: none, minimal, conservative, optimistic, aggressive)

GCP

ColumnStore Multi

10.5

optimistic (choices: none, minimal, conservative, optimistic, aggressive)

GCP

Galera

10.4

conservative (choices: none, minimal, conservative, optimistic, aggressive)

GCP

Galera

10.5

conservative (choices: none, minimal, conservative, optimistic, aggressive)

GCP

HA (Primary/Replica)

10.4

conservative (choices: none, minimal, conservative, optimistic, aggressive)

GCP

HA (Primary/Replica)

10.5

conservative (choices: none, minimal, conservative, optimistic, aggressive)

GCP

HTAP

10.5

optimistic (choices: none, minimal, conservative, optimistic, aggressive)

GCP

Transactional Standalone

10.4

conservative (choices: none, minimal, conservative, optimistic, aggressive)

GCP

Transactional Standalone

10.5

optimistic (choices: none, minimal, conservative, optimistic, aggressive)

GCP

Distributed Transactions

10.5

conservative (choices: none, minimal, conservative, optimistic, aggressive)

See MariaDB SkySQL documentation to learn more about the MariaDB SkySQL database as a service.

CHANGE HISTORY

Release Series

History

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.

  • Default value changed in MariaDB Community Server 10.5.1 from conservative to optimistic

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.

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.

EXTERNAL REFERENCES