o Uptime
The number of seconds the MySQL server has been running.

o Threads
The number of active threads (clients).

o Questions
The number of questions (queries) from clients since the server was started.

o Slow queries
The number of queries that have taken more than long_query_time seconds. (MySQL DOSC 'The Slow Query Log' section).

o Opens
The number of tables the server has opened.

o Flush tables
The number of flush-*, refresh, and reload commands the server has executed.

o Open tables
The number of tables that currently are open.