Global and Thread Consumers-opracowanie

Global and Thread Consumers
• global_instrumentation is the highest level consumer. If global_instrumentation is NO,
it disables global instrumentation. All other settings are lower level and are not checked; it does
not matter what they are set to. No global or per thread information is maintained and no individual
events are collected in the current-events or event-history tables. If global_instrumentation
is YES, the Performance Schema maintains information for global states and also checks the
thread_instrumentation consumer.
• thread_instrumentation is checked only if global_instrumentation is YES. Otherwise,
if thread_instrumentation is NO, it disables thread-specific instrumentation and all lowerlevel
settings are ignored. No information is maintained per thread and no individual events
are collected in the current-events or event-history tables. If thread_instrumentation
is YES, the Performance Schema maintains thread-specific information and also checks
events_xxx_current consumers.
... zobacz całą notatkę