Error starting mysql server

I just downloaded mysql using brew install mysql.
It worked the first time. but now its giving the following error :
 mysql.server restart
I tried reinstalling it and it worked again. but again after the pc was restarted it crashed.
what could be going wrong

 ERROR! MySQL server PID file could not be found!
Starting MySQL
. ERROR! The server quit without updating PID file (/usr/local/var/mysql/

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Rohit BajajAsked:
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Kanti PrasadCommented:

Change the permissions at the mysql folder using  chmod 0777

 chmod 0777 /var/lib/mysql/ib_logfile0
chmod 0777 /var/lib/mysql/ib_logfile1
chown -R mysql:root /var/lib/mysql

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Rohit BajajAuthor Commented:
Thanks that worked
But i dont understand why we are changing the permission of mysql to root
wont that restrict the access ??
Kanti PrasadCommented:

You are only changing the file owner and group information (chown) and not the permission to run the daemon for MySQL (mysqld) .

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MySQL Server

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