PS Aux memory usage 17.1?

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http://stackoverflow.com – I'm very new to SSH/Linux and was wondering if someone could kindly help out. We've had our server crash a few times over the past month or so, and it was from huge spikes of 'traffic'. Not from web traffic, but I believe it's from our cron scripts/mysql. After typing in psaux, I noticed that there is one line where the memory usage and %CPU spike. This is what the line looks like. mysql 11292 4.6 17.1 3277048 671916 ? Sl 19:45 4:36 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin The next highest is from a line that looks li (HowTos)