INNODB_METRICS table presents a
wide variety of
InnoDB performance information,
complementing the specific focus areas of the
PERFORMANCE_SCHEMA tables for
InnoDB. With simple queries, you can check the
overall health of the system. With more detailed queries, you can
diagnose issues such as performance bottlenecks, resource
shortages, and application issues.
Each monitor represents a point within the
InnoDB source code that is instrumented to
gather counter information. Each counter can be started, stopped,
and reset. You can also perform these actions for a group of
counters using their common module name.
By default, relatively little data is collected. To start, stop,
and reset counters, you set one of the configuration options
the name of the counter, the name of the module, a wildcard match
for such a name using the “%” character, or the
For usage information, see Section 14.15.6, “InnoDB INFORMATION_SCHEMA Metrics Table”.
INNODB_METRICS table has these
Unique name for the counter.
The aspect of
InnoDBthat the metric applies to. See the list following the table for the corresponding module names to use with the
Value since the counter is enabled.
Maximum value since the counter is enabled.
Minimum value since the counter is enabled.
Average value since the counter is enabled.
Counter value since it was last reset. (The
_RESETfields act like the lap counter on a stopwatch: you can measure the activity during some time interval, while the cumulative figures are still available in the
MAX_COUNT, and so on fields.)
Maximum counter value since it was last reset.
Minimum counter value since it was last reset.
Average counter value since it was last reset.
Timestamp of last start.
Timestamp of last stop.
Elapsed time in seconds since the counter started.
Timestamp of last stop.
Whether the counter is still running (
enabled) or stopped (
Whether the item is a cumulative counter, or measures the current value of some resource.
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts"\G *************************** 1. row *************************** NAME: dml_inserts SUBSYSTEM: dml COUNT: 3 MAX_COUNT: 3 MIN_COUNT: NULL AVG_COUNT: 0.046153846153846156 COUNT_RESET: 3 MAX_COUNT_RESET: 3 MIN_COUNT_RESET: NULL AVG_COUNT_RESET: NULL TIME_ENABLED: 2014-12-04 14:18:28 TIME_DISABLED: NULL TIME_ELAPSED: 65 TIME_RESET: NULL STATUS: enabled TYPE: status_counter COMMENT: Number of rows inserted