Performance Schema Miscellaneous Tables 5084 27.12.21.4 The performance_timers Table The  log_status  table provides information that enables an online backup tool to copy the required log files without locking those resources for the duration of the copy process. When the  log_status  table is queried, the server blocks logging and related administrative changes for just long enough to populate the table, then releases the resources. The  log_status  table informs the online backup which point it should copy up to in the source’s binary log and  gtid_executed  record, and the relay log for each replication channel. It also provides relevant information for individual storage engines, such as the last log sequence number (LSN) and the LSN of the last checkpoint taken for the InnoDB  storage engine. The  log_status  table has these columns: The server UUID for this server instance. This is the generated unique value of the read-only system variable  server_uuid . The log position state information from the source, provided as a single JSON object with the following keys: A JSON array of channels, each with the following information: Relevant information from individual storage engines, provided as a JSON object with one key for each applicable storage engine. The  log_status  table has no indexes. The  BACKUP_ADMIN  privilege, as well as the  SELECT  privilege, is required for access to the  log_status table. TRUNCATE TABLE  is not permitted for the  log_status  table. • STORAGE_ENGINES • REPLICATION • LOCAL • SERVER_UUID binary_log_file The name of the current binary log file. binary_log_position The current binary log position at the time the  log_status  table was accessed. gtid_executed The current value of the global server variable  gtid_executed at the time the  log_status  table was accessed. This information is consistent with the  binary_log_file  and binary_log_position  keys. channel_name The name of the replication channel. The default replication channel’s name is the empty string (“” ). relay_log_file The name of the current relay log file for the replication channel. relay_log_pos The current relay log position at the time the  log_status  table was accessed.