stage/sql/Copying to tmp table stage/innodb/alter table (end) stage/innodb/alter table (flush) stage/innodb/alter table (insert) stage/innodb/alter table (log apply index) stage/innodb/alter table (log apply table) stage/innodb/alter table (merge sort) stage/innodb/alter table (read PK and internal sort) stage/innodb/buffer pool load sys Schema Object Reference Stage progress reporting requires that the  events_stages_current  consumer be enabled, as well as the instruments for which progress information is desired. Instruments for these stages currently support progress reporting: For stages that do not support estimated and completed work reporting, or if the required instruments or consumers are not enabled, the  progress  column is  NULL . The  sys  schema includes tables and triggers, views, and stored procedures and functions. The following sections provide details for each of these objects. The following tables list  sys  schema objects and provide a short description of each one. 5134 Table or Trigger Name Description sys_config sys schema configuration options table sys_config_insert_set_user sys_config insert trigger sys_config_update_set_user sys_config update trigger View Name Description host_summary ,  x$host_summary Statement activity, file I/O, and connections, grouped by host host_summary_by_file_io ,  x $host_summary_by_file_io File I/O, grouped by host host_summary_by_file_io_type ,  x $host_summary_by_file_io_type File I/O, grouped by host and event type host_summary_by_stages ,  x $host_summary_by_stages Statement stages, grouped by host host_summary_by_statement_latency ,  x $host_summary_by_statement_latency Statement statistics, grouped by host host_summary_by_statement_type ,  x $host_summary_by_statement_type Statements executed, grouped by host and statement innodb_buffer_stats_by_schema ,  x $innodb_buffer_stats_by_schema InnoDB  buffer information, grouped by schema innodb_buffer_stats_by_table ,  x $innodb_buffer_stats_by_table InnoDB  buffer information, grouped by schema and table innodb_lock_waits ,  x$innodb_lock_waits InnoDB  lock information Table 28.2 sys Schema Views Table 28.1 sys Schema Tables and Triggers 28.4.1 sys Schema Object Index 28.4 sys Schema Object Reference