Why is My MySQL Server Quitting Without Updating the PID File on Mac OS X?

MySQL Server Startup Error: "The Server Quit Without Updating PID File"

When starting MySQL on Mac OS X v10.6 (Snow Leopard), users may encounter the error "The server quit without updating PID file." This error often stems from permission issues or the presence of conflicting MySQL instances.

Identifying the Root Cause

To pinpoint the underlying cause, locate the log file with the ".err" suffix, which typically provides more detailed information. It can be found in the following location:

/usr/local/var/mysql/your_computer_name.local.err

Troubleshooting Steps

1. Check for Running MySQL Instances

Run the following command to determine if any MySQL instances are active:

ps -ef | grep mysql

If instances are running, terminate them using:

kill -9 PID

where PID corresponds to the process ID from the previous command.

2. Verify Ownership of MySQL Data Directory

Check the ownership of the directory "/usr/local/var/mysql/" with:

ls -laF /usr/local/var/mysql/

If it's owned by root, change the ownership to "mysql" or your desired user:

sudo chown -R mysql /usr/local/var/mysql/

Additional Considerations

• Ensure that your my.cnf configuration file contains the correct values for "pid-file" and "socket."
• Check for any corrupted files in the MySQL data directory.
• If your Mac OS X version is newer than Snow Leopard, the default MySQL location may be different. Consult Apple documentation for the appropriate path.

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