localhost or 127.0.0.1 in mysql_connect(): Performance and Connection Differences?

localhost vs. 127.0.0.1 in mysql_connect()

Question 1: Performance Implications

Does connecting to MySQL using "localhost" in mysql_connect() offer a performance advantage over "127.0.0.1"?

Answer:

The performance impact of using "localhost" vs. "127.0.0.1" depends on the operating system.

• Windows: "127.0.0.1" always uses TCP/IP, but "localhost" attempts to use a Unix domain socket if it's available. Unix domain sockets are faster due to less overhead.
• Linux: "localhost" defaults to a Unix domain socket, while "127.0.0.1" uses TCP/IP. Unix domain sockets offer a slight performance boost.

Question 2: Connection Type

What type of connection is established between the PHP script and MySQL when using the mysql_connect() function?

Answer:

The connection type depends on the host identifier used:

• "localhost": Linux tries to use a Unix domain socket, while Windows uses TCP/IP.
• "127.0.0.1": All systems use TCP/IP.

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