MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0

29.12.11 Performance Schema Replication Tables

The Performance Schema provides tables that expose replication information. This is similar to the information available from the SHOW REPLICA STATUS statement, but representation in table form is more accessible and has usability benefits:

Replication Table Descriptions

The Performance Schema provides the following replication-related tables:

The following Performance Schema replication tables continue to be populated when the Performance Schema is disabled:

The exception is local timing information (start and end timestamps for transactions) in the replication tables replication_connection_status, replication_applier_status_by_coordinator, and replication_applier_status_by_worker. This information is not collected when the Performance Schema is disabled.

The following sections describe each replication table in more detail, including the correspondence between the columns produced by SHOW REPLICA STATUS and the replication table columns in which the same information appears.

The remainder of this introduction to the replication tables describes how the Performance Schema populates them and which fields from SHOW REPLICA STATUS are not represented in the tables.

Replication Table Life Cycle

The Performance Schema populates the replication tables as follows:

Replica Status Information Not In the Replication Tables

The information in the Performance Schema replication tables differs somewhat from the information available from SHOW REPLICA STATUS because the tables are oriented toward use of global transaction identifiers (GTIDs), not file names and positions, and they represent server UUID values, not server ID values. Due to these differences, several SHOW REPLICA STATUS columns are not preserved in the Performance Schema replication tables, or are represented a different way:

Replication Channels

The first column of the replication Performance Schema tables is CHANNEL_NAME. This enables the tables to be viewed per replication channel. In a non-multisource replication setup there is a single default replication channel. When you are using multiple replication channels on a replica, you can filter the tables per replication channel to monitor a specific replication channel. See Section 19.2.2, “Replication Channels” and Section, “Monitoring Multi-Source Replication” for more information.