content_image/829320.jpg content_image/829321.jpg content_image/829314.jpg
if it is, omits the step of calculating the transactions that should be skipped or not skipped, so that the old relay logs are not required for the recovery process. 

<img src='content_image/829320.jpg'>

• relay_log_space_limit 

## Note 

This variable does not affect the following Group Replication channels: 

• group_replication_applier 

• group_replication_recovery 

Any other channels running on a group are affected, such as a channel which is replicating from an outside source or another group. 

<img src='content_image/829321.jpg'>

The maximum amount of space to use for all relay logs. 

• replication_optimize_for_static_plugin_config 

<img src='content_image/829314.jpg'>

Use shared locks, and avoid unnecessary lock acquisitions, to improve performance for semisynchronous replication. This setting and replication_sender_observe_commit_only  help as the number of replicas increases, because contention for locks can slow down performance. While this system variable is enabled, the semisynchronous replication plugin cannot be uninstalled, so you must disable the system variable before the uninstall can complete. 

This system variable can be enabled before or after installing the semisynchronous replication plugin, and can be enabled while replication is running. Semisynchronous replication source servers can 

