3rd party software/SQL

PostgreSQL

Website

http://www.postgresql.org/

About

http://www.postgresql.org/about/

FAQ

http://www.postgresql.org/docs/faqs.FAQ.html

Wikipedia

http://en.wikipedia.org/wiki/Postgresql

Manuals

http://www.postgresql.org/docs/

MySQL

Website

http://www.mysql.com

About

http://www.mysql.org/company/

FAQ

http://www.mysql.com/industry/faq/

Wikipedia

http://en.wikipedia.org/wiki/MySQL

Manuals

http://dev.mysql.com/doc/#refman

FAQ - Why do I get "Too many connections" when connecting to MySQL, and how can I solve it?

The MySQL server limits how many connections are used when connecting. This prevents complications from out of control, or too many connections that might otherwise leave the server unresponsive.

See more information about the max_connections setting at http://dev.mysql.com/doc/refman/5.0/en/too-many-connections.html

Also, you can set this on a per user basis, so 'freeside' could have 30 connections, and the radius server could have 50 connections. This finer grained tuning is an exercise left to the user. (feel free to log your findings in the talk page if you see fit)

FAQ - How do I tell what port mysql uses?

You can check the server directly, or make a good guess from a client. The default port is most always 3306. Use these steps to confirm, or to isolate for troubleshooting.

On the server

• # netstat -tlnp | grep mysqld
• $ grep mysql /etc/services
• Review the [mysqld] section of /etc/mysql/my.cnf for port = settings. (file location varies)

As a mysql client

• Review the [client] section of /etc/mysql/my.cnf for port = settings. (file location varies)
• As a last resort, strace -e connect mysql -h example.com Output will be less noisy if you use example.com as a literal. Eg, connect(3, {sa_family=AF_INET, sin_port=htons(3306), sin_addr=inet_addr("208.77.188.166")}, 16 <unfinished ...>

See Also

List of DBMS on Wikipedia