#### 27.12.11.3 The replication\_asynchronous\_connection\_failover Table

[]()[]()

 This table holds the replica's source lists for each replication channel for the asynchronous connection failover mechanism. The asynchronous connection failover mechanism automatically establishes an asynchronous (source to replica) replication connection to a new source from the appropriate list after the existing connection from the replica to its source fails. When asynchronous connection failover is enabled for a group of replicas managed by Group Replication, the source lists are broadcast to all group members when they join, and also when the lists change.

 You set and manage source lists using the [`asynchronous_connection_failover_add_source`](replication-functions-source-list.html#function_asynchronous-connection-failover-add-source) and [`asynchronous_connection_failover_delete_source`](replication-functions-source-list.html#function_asynchronous-connection-failover-delete-source) functions to add and remove replication source servers from the source list for a replication channel. To add and remove managed groups of servers, use the [`asynchronous_connection_failover_add_managed`](replication-functions-source-list.html#function_asynchronous-connection-failover-add-managed) and [`asynchronous_connection_failover_delete_managed`](replication-functions-source-list.html#function_asynchronous-connection-failover-delete-managed) functions instead.

 For more information, see [Section 17.4.9, “Switching Sources and Replicas with Asynchronous Connection Failover”](replication-asynchronous-connection-failover.html).

 The [`replication_asynchronous_connection_failover`](performance-schema-replication-asynchronous-connection-failover-table.html) table has these columns:

* `CHANNEL_NAME`

   The replication channel for which this replication source server is part of the source list. If this channel's connection to its current source fails, this replication source server is one of its potential new sources.

* `HOST`

   The host name for this replication source server.

* `PORT`

   The port number for this replication source server.

* `NETWORK_NAMESPACE`

   The network namespace for this replication source server. If this value is empty, connections use the default (global) namespace.

* `WEIGHT`

   The priority of this replication source server in the replication channel's source list. The weight is from 1 to 100, with 100 being the highest, and 50 being the default. When the asynchronous connection failover mechanism activates, the source with the highest weight setting among the alternative sources listed in the source list for the channel is chosen for the first connection attempt. If this attempt does not work, the replica tries with all the listed sources in descending order of weight, then starts again from the highest weighted source. If multiple sources have the same weight, the replica orders them randomly.

* `MANAGED_NAME`

   The identifier for the managed group that the server is a part of. For the `GroupReplication` managed service, the identifier is the value of the [`group_replication_group_name`](group-replication-options.html#sysvar_group_replication_group_name) system variable.

 The [`replication_asynchronous_connection_failover`](performance-schema-replication-asynchronous-connection-failover-table.html) table has these indexes:

* Primary key on (`CHANNEL_NAME, HOST, PORT, NETWORK_NAMESPACE, MANAGED_NAME`)

[`TRUNCATE TABLE`](truncate-table.html) is not permitted for the [`replication_asynchronous_connection_failover`](performance-schema-replication-asynchronous-connection-failover-table.html) table.

