Consistency checking and backup in 24-7 environment

According to the manuals, one should perform a variety of oncheck commands to ensure your instance is clean before a level 0 archive. Since I'm the kind of person that does what I am told, I have a script that executes the following commands before each level 0 archive: # validate reserved pages oncheck -crq # validate system catalog tables oncheck -ccq # validate extends oncheck -ceq # validate indexes oncheck -cIq # validate pages oncheck -cDq The problem is locking. oncheck might bail out because it can't get exclusive access to a table or an application might get a lock timeout because of oncheck's locks. Do I dare eliminate any of the above checks? Could I perhaps do some or all of them less frequently? What consequences might I face if an inconsistency in the database occurs? Jeff Larsen