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 |
|
10.5 Community |
|
10.4 Enterprise |
|
10.4 Community |
|
10.3 Enterprise |
|
10.3 Community |
|
10.2 Enterprise |
|
10.2 Community |
|
EXTERNAL REFERENCES
Additional information on this topic may be found in the MariaDB Public Knowledge Base.
Information specific to MariaDB SkySQL can be found on the slave_parallel_mode page in the SkySQL Documentation.