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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: 

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 

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 . 

## 28.4 sys Schema Object Reference 

The sys  schema includes tables and triggers, views, and stored procedures and functions. The following sections provide details for each of these objects. 

## 28.4.1 sys Schema Object Index 

The following tables list sys  schema objects and provide a short description of each one. 

<img src='content_image/857044.jpg'>

<img src='content_image/857045.jpg'>

