cert.optimistic_pa
This page is part of MariaDB's Documentation.
The parent of this page is: wsrep Provider Options for MariaDB Enterprise Server
Topics on this page:
Overview
Controls parallel applying of replica actions
The wsrep_provider_options
system variable applies to MariaDB Enterprise Cluster, powered by Galera and to Galera Cluster available with MariaDB Community Server. This page relates specifically to the cert.optimistic_wsrep_provider_options
.
See also: wsrep Provider Options for MariaDB Enterprise Server 11.4, in 10.6 ES, 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
DETAILS
The cert.optimistic_pa
option controls the parallel application of Replica actions. When enabled, cert.optimistic_pa
allows the full range of parallelization as determined by the certification algorithm. When disabled, cert.optimistic_pa
limits the parallel application window to not exceed that seen on Primary. The action will start once all actions are committed. Actions should be performed primarily on the Primary node.
Attribute | Value |
---|---|
Option Name | cert.optimistic_pa |
Default Value | YES |
Dynamic | YES |
Debug |
|
EXAMPLES
Display Current Value
wsrep_provider_options
define optional settings the node passes to the wsrep provider.
To display current wsrep_provider_options
values:
SHOW GLOBAL VARIABLES LIKE 'wsrep_provider_options';
The expected output will display the option and the value. Options with no default value, for example SSL options, will not be displayed in the output.
Set in Configuration File
When changing a setting for a wsrep_
Options are set in the my.cnf
configuration file. Use the ;
delimiter to set multiple options.
The configuration file must be updated on each node. A restart to each node is needed for changes to take effect.
Use a quoted string that includes every option where you want to override the default value. Options that are not in the list will reset to their default value.
To set the option in the configuration file:
wsrep_provider_options='cert.optimistic_pa=NO;gcache.debug=YES;gcs.fc_limit=NO;socket.send_buf_size=NO;evs.keepalive_period=PT3S'
Set Dynamically
Changes made dynamically with SET GLOBAL
are not durable and will be lost when the server is stopped. To be durable, changes must be set in the configuration file.
The cert.optimistic_pa option can be set dynamically using the SET GLOBAL
command. Setting wsrep_provider_options
dynamically does not change the value of other wsrep_provider_options
.
To set cert.optimistic_pa dynamically:
SET GLOBAL wsrep_provider_options='cert.optimistic_pa=NO';
To dynamically set multiple options in a single statement:
SET GLOBAL wsrep_provider_options='cert.optimistic_pa=NO;cert.optimistic_pa=NO';
CHANGE HISTORY
Release Series | History |
---|---|
11.4 Enterprise |
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10.6 Enterprise |
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10.6 Community |
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10.5 Enterprise |
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10.5 Community |
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10.4 Enterprise |
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10.4 Community |
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10.3 Enterprise |
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10.3 Community |
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10.2 Enterprise |
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10.2 Community |
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