x$host_summary

VIEW `x$host_summary` AS SELECT
  if(`performance_schema`.`accounts`.`HOST` is null,'background',`performance_schema`.`accounts`.`HOST`) AS `host`,
  sum(`stmt`.`total`) AS `statements`,
  sum(`stmt`.`total_latency`) AS `statement_latency`,
  sum(`stmt`.`total_latency`) / sum(`stmt`.`total`) AS `statement_avg_latency`,
  sum(`stmt`.`full_scans`) AS `table_scans`,
  sum(`io`.`ios`) AS `file_ios`,
  sum(`io`.`io_latency`) AS `file_io_latency`,
  sum(`performance_schema`.`accounts`.`CURRENT_CONNECTIONS`) AS `current_connections`,
  sum(`performance_schema`.`accounts`.`TOTAL_CONNECTIONS`) AS `total_connections`,
  count(distinct `performance_schema`.`accounts`.`USER`) AS `unique_users`,
  sum(`mem`.`current_allocated`) AS `current_memory`,
  sum(`mem`.`total_allocated`) AS `total_memory_allocated`
FROM (((`performance_schema`.`accounts` join `sys`.`x$host_summary_by_statement_latency` `stmt` on(`performance_schema`.`accounts`.`HOST` = `stmt`.`host`)) join `sys`.`x$host_summary_by_file_io` `io` on(`performance_schema`.`accounts`.`HOST` = `io`.`host`)) join `sys`.`x$memory_by_host_by_current_bytes` `mem` on(`performance_schema`.`accounts`.`HOST` = `mem`.`host`)) group by if(`performance_schema`.`accounts`.`HOST` is null,'background',`performance_schema`.`accounts`.`HOST`)