6.22 Performance Schema Activity Metrics

Lists the Performance Schema Activity metrics and provides a brief description of each.

Table 6.22 Performance Schema Activity Metrics

Name	Description
Cond Classes Lost (Delta)	How many instruments of type cond could not be loaded.
Cond Instances Lost (Delta)	How many instances of object type cond could not be created.
File Classes Lost (Delta)	How many instruments of type file could not be loaded.
File Handles Lost (Delta)	How many instances of object type file could not be opened.
File Instances Lost (Delta)	How many instances of object type file could not be created.
Hosts Lost (Delta)	How many hosts were lost.
Index Stat Lost (Delta)	The number of indexes for which statistics were lost.
Locker Lost (Delta)	How many events are lost or not recorded.
Memory Classes Lost (Delta)	The number of times a memory instrument could not be loaded.
Metadata Lock Lost (Delta)	The number of metadata locks that could not be instrumented in the metadata_locks table.
Mutex Classes Lost (Delta)	How many instruments of type mutex could not be loaded.
Mutex Instances Lost (Delta)	How many instances of object type mutest could not be created.
Nested Statement Lost (Delta)	The number of stored program statements for which statistics were lost.
Prepared Statements Lost (Delta)	The number of prepared statements that could not be instrumented in the prepared_statements_instances table.
Program Lost (Delta)	The number of stored programs for which statistics were lost.
Rwlock Classes Lost (Delta)	How many instruments of type rwlock could not be loaded.
Rwlock Instances Lost (Delta)	How many instances of object type rwlock could not be created.
Session Connect Attrs Longest Seen (Delta)	The longest valid attribute buffer size that was tracked.
Table Handles Lost (Delta)	How many instances of object type table could not be opened.
Table Instances Lost (Delta)	How many instances of object type table could not be created.
Table Lock Stat Lost (Delta)	The number of tables for which lock statistics were lost.
Thread Classes Lost (Delta)	How many instruments of type thread could not be loaded.
Thread Instances Lost (Delta)	How many instances of object type thread could not be created.