Top-Level Instrument Elements stage/sql/Sorting result statement/com/Execute statement/com/Query statement/sql/create_table statement/sql/lock_tables errors The instrument name space has a tree-like structure. The elements of an instrument name from left to right provide a progression from more general to more specific. The number of elements a name has depends on the type of instrument. The interpretation of a given element in a name depends on the elements to the left of it. For example, myisam  appears in both of the following names, but  myisam  in the first name is related to file I/O, whereas in the second it is related to a synchronization instrument: wait/io/file/myisam/log wait/synch/cond/myisam/MI_SORT_INFO::cond Instrument names consist of a prefix with a structure defined by the Performance Schema implementation and a suffix defined by the developer implementing the instrument code. The top-level element of an instrument prefix indicates the type of instrument. This element also determines which event timer in the performance_timers  table applies to the instrument. For the prefix part of instrument names, the top level indicates the type of instrument. The suffix part of instrument names comes from the code for the instruments themselves. Suffixes may include levels such as these: 4925 Top-Level Instrument Elements • statement : An instrumented statement event. • stage : An instrumented stage event. • memory : An instrumented memory event. • error : An instrumented error event. This instrument has no further elements. • idle : An instrumented idle event. This instrument has no further elements. •Wait Instrument Elements •Thread Instrument Elements •Statement Instrument Elements •Stage Instrument Elements •Memory Instrument Elements •Error Instrument Elements •Idle Instrument Elements •The name of a variable in the code, in the form  XXX  (a global variable) or  CCC :: MMM  (a member  MMM  in class  CCC ). Examples:  COND_thread_cache ,  THR_LOCK_myisam ,  BINLOG::LOCK_index . •Top-Level Instrument Elements •A name for the major element (a server module such as  myisam ,  innodb ,  mysys , or  sql ) or a plugin name.