slave_parallel_mode

This page is part of MariaDB's MariaDB Documentation.

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

Topics on this page:

Overview
DETAILS
- PARAMETERS
- SKYSQL
CHANGE HISTORY
EXTERNAL REFERENCES

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.

DETAILS

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 (choices: none, minimal, conservative, optimistic, aggressive)
	Enterprise Server With Replica(s)	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)
	Enterprise Server Single Node	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	ColumnStore Data Warehouse	10.6	optimistic (choices: none, minimal, conservative, optimistic, aggressive)
	Enterprise Server With Replica(s)	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)
	Enterprise Server Single Node	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)

See SkySQL details in MariaDB SkySQL previous release
See SkySQL details in MariaDB SkySQL new release

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

Additional information on this topic may be found in the MariaDB Public Knowledge Base.