counter
A value that is incremented by a particular kind of InnoDB operation. Useful for measuring how busy a server is, troubleshooting the sources of performance issues, and testing whether changes (for example, to configuration settings or indexes used by queries) have the desired low-level effects. Different kinds of counters are available through performance-schema tables and information-schema tables, particularly information-schema.innodb-metrics.
See also INFORMATION-SCHEMA.
See also metrics counter.
See also Performance Schema.