slave_parallel_mode

Overview

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 for MariaDB Enterprise Server 10.6, in 10.5 ES, in 10.4 ES, in 10.3 ES, in 10.2 ES, in 10.6 CS, in 10.5 CS, in 10.4 CS, in 10.3 CS, and in 10.2 CS

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

USAGE

DETAILS

SYNONYMS

SCHEMA

PARAMETERS

Command-line

--slave_parallel_mode={none|minimal|conservative|optimistic|aggressive}

Configuration file

Supported

Dynamic

Yes

Scope

Global

Data Type

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

Product Default Value

optimistic

SKYSQL

Cloud

SkySQL Topology

ES Ver

Service Default

AWS

Multi-Node Analytics

10.6

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

Single Node Analytics

10.6

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

Replicated Transactions

10.4

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

10.5

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

10.6

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

Single Node Transactions

10.4

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

10.5

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

10.6

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

GCP

Multi-Node Analytics

10.6

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

Single Node Analytics

10.6

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

Replicated Transactions

10.4

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

10.5

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

10.6

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

Single Node Transactions

10.4

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

10.5

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

10.6

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

Cloud

SkySQL Topology

ES Ver

Service Default

AWS

ColumnStore Data Warehouse

10.6

optimistic

Enterprise Server With Replica(s)

10.4

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

10.5

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

10.6

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

Enterprise Server Single Node

10.4

conservative

10.5

optimistic

10.6

optimistic

GCP

ColumnStore Data Warehouse

10.6

optimistic

Enterprise Server With Replica(s)

10.4

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

10.5

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

10.6

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

Enterprise Server Single Node

10.4

conservative

10.5

optimistic

10.6

optimistic

PRIVILEGES

EXAMPLES

ERROR HANDLING

FEATURE INTERACTION

RESPONSES

DIAGNOSIS

ISO 9075:2016

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

  • Default value changed in MariaDB Enterprise Server 10.5.3-1 from conservative to optimistic

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.

Release Series

History

10.6 Enterprise

  • Present starting in MariaDB Enterprise Server 10.6.4-1.

10.5 Enterprise

  • Default value changed in MariaDB Enterprise Server 10.5.3-1 from conservative to optimistic

10.4 Enterprise

  • Present starting in MariaDB Enterprise Server 10.4.6-1.

EXTERNAL REFERENCES