1) "24x7x365 service on a mission-critical system" 2) "(I don't want to drop $annual_profit_margin on Oracle)" If it's critical, you're willing to pay for it.

1) "24x7x365 service on a mission-critical system" 2) "(I don't want to drop $annual_profit_margin on Oracle)" If it's critical, you're willing to pay for it. If you're not willing to pay for it, it's not critical. This comes naturally from the definition of mission critical.