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Thank you Jsamuel, now I get new knowledge…I hope we can share our knowledge each other.
Have you checked the logs for mysql?
Debian/Ubuntu:
# cat /var/log/mysql.err
# cat /var/log/mysql.log
CentOS/Fedora:
# cat /var/log/mysqld.err
# cat /var/log/mysqld.log
FreeBSD:
# cat /var/db/mysql/`hostname`.err
You might want to check /var/log/syslog for “Out of memory” message as described here:
How to Fix WordPress ‘error establishing a database connection’