As noted in the ZCS Administration Guide , zmdbintegrityreport is a crontab task that runs once a week, to check the MySQL database for corruption. zmdbintegrityreport essentially is a wrapper for mysqlcheck, a standard MySQL tool that is distributed with the MySQL package.
Report on any database inconsistencies
zmdbintegrityreport is run weekly to check the MySQL database for corruption and will notify the administrator if any corruption is found. When this is run, it may consume a significant amount of I/O. If you find that it is an issue, you may want to change the frequency with which zmdbintegrityreport is run by editing the ZCS crontab entry. This report runs at 11:00 p.m. Sundays.
Large sites may opt to disable this by setting the following:
zmlocalconfig -e zmdbintegrityreport_disabled=TRUE
If you choose to disable this, it is recommended that the integrity report be run by hand during the normal maintenance windows and prior to running any ZCS upgrades.