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logaholic high mysql load on daily backup

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http://forums.cpanel.net – very high load mysql load seen for 5-6 hours daily, when daily compressed backups run. load seems to be with mysql process. Typical ps snaphot is as; mysql 6896 14.2 4.0 802300 373804 ? SNl Jun23 1088:19 \_ /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log-error=/var/lib/mysql/server.linuxhostingserver.com.err --pid-file=/var/lib/mysql/server.linuxhostingserver.com.pid root 28163 0.0 0.0 46156 8472 ? SNs 02:00 0:00 /usr/local/cpanel/scripts/cpbackup root 2598 0.0 0.0 3796 448 ? SN 02:07 0:00 \_ /usr/local/cpan (HowTos)