How can I see how many MySQL connections are open?

Question

How can I see how many connections have been opened during the current request via mysql_connect in PHP running on Apache?

I know that if I call m

Answer 1

Current connections status:

mysqladmin status

Look at Threads: count. More detailed information about current connections can be obtained with the commands:

user@host:~$ mysqladmin -uroot -ppass extended-status | grep Threads
| Threads_cached                           | 0           |
| Threads_connected                        | 3           |
| Threads_created                          | 3           |
| Threads_running                          | 1           |

user@host:~$ mysqladmin -uroot -ppass processlist
+----+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host      | db | Command | Time | State | Info             |
+----+------+-----------+----+---------+------+-------+------------------+
| 53 | root | localhost |    | Sleep   | 258  |       |                  |
| 54 | root | localhost |    | Sleep   | 253  |       |                  |
| 58 | root | localhost |    | Query   | 0    |       | show processlist |
+----+------+-----------+----+---------+------+-------+------------------+

FYI mysqladmin -v -uroot -ppass processlist is analog of show full processlist.

Commands can be shortened to any unique prefix, and called simultaneously:

user@host:~$ mysqladmin -v -uroot -ppass proc stat
+----+------+-----------+----+---------+------+-------+-----------------------+
| Id | User | Host      | db | Command | Time | State | Info                  |
+----+------+-----------+----+---------+------+-------+-----------------------+
| 53 | root | localhost |    | Sleep   | 951  |       |                       |
| 54 | root | localhost |    | Sleep   | 946  |       |                       |
| 65 | root | localhost |    | Query   | 0    |       | show full processlist |
+----+------+-----------+----+---------+------+-------+-----------------------+
Uptime: 1675  Threads: 3  Questions: 171  Slow queries: 0  Opens: 235  
Flush tables: 1  Open tables: 57  Queries per second avg: 0.102