Does using \"localhost\" or \"127.0.0.1\" in `mysql_connect()` Affect Connection Speed?

Localhost vs. 127.0.0.1 in mysql_connect()

Do these hostnames affect connection speed?

In mysql_connect(), using localhost does not necessarily make the connection faster than using 127.0.0.1. The connection speed difference depends on the operating system.

Linux: When using localhost, Linux may attempt to establish a Unix Domain Socket connection with MySQL. This method is generally faster than TCP/IP due to lower overhead. However, using 127.0.0.1 forces a TCP/IP connection, which may be slower.

Windows: By default, Windows always uses TCP/IP for database connections, regardless of whether you specify localhost or 127.0.0.1.

Connection Type

When using mysql_connect() with localhost, the connection type is determined by the operating system.

Linux:

• localhost: Unix Domain Socket (if available)
• 127.0.0.1: TCP/IP

Windows:

• localhost: TCP/IP
• 127.0.0.1: TCP/IP

Conclusion:

The choice between localhost and 127.0.0.1 in mysql_connect() primarily impacts the connection type on Linux but has no significant effect on speed on Windows. If speed is a concern, consider using a Unix Domain Socket on Linux by specifying localhost.

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