How to find the active number of open database connections in H2/MySQL

问题

How to find the active number of open database connections in H2/MySQL. We need this information to identify if there are any connection leaks.

回答1:

For H2, use:

select * from information_schema.sessions;

For MySQL, use:

show full processlist;

or

select * from information_schema.processlist;

If you are just interested in the session count, use select count(*) instead of select *

来源：https://stackoverflow.com/questions/6137683/how-to-find-the-active-number-of-open-database-connections-in-h2-mysql