Root/Admin password question

I upgraded to Snow Leopard and successfully installed MySQL 5.4.3-beta...x86 on the old white Intel iMac. I am the only user on the machine and have an admin password that works for everything that asks for the admin password.
So far so good.
However, looking at the MySQL data directory (/usr/local/mysql/data)in a Terminal window shows that the owner is _mysql and the group is wheel with permissions set to 750. I need to put some MySQL databases in that directory, but setting user (with su or sudo) to _mysql asks for a Password, and keying in my admin password fails with su: Sorry. Su to root returns the same thing.
Is there system root password or is the admin password the same as root?
If so, is there some anomaly in 10.6 with user/group/passwords or am I missing something simple?

I also set a password for MySQL but that still fails to allow me to do anything from a Terminal with the data directory.
I changed the owner of the directory to root and can sudo ls -l the directory, but I don't know if the _mysql owner is required somewhere in MySQL code and changing it to be owned by root will cause problems.

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    This question was solved.
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    {---------- Please click the "Thumbs Up" to say thanks for helping.
    Please click "Accept As Solution" if my help has solved your problem. ----------}
    This is a user supported forum. I am a volunteer and I do not work for HP.

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    Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.

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