Security is often an afterthought. Even for OLTP. In DSS, where afterthoughts are as common as Cartesian products, it is wise to try to address as much as possible of any issue as early as possible, planning with foresight so that mention of change later on will not cause grim nightmares, serious indigestion and a flood of resumes across the corporate firewall.
It is easier to put security systems in a building during its construction. It's more expensive to do it afterwards. Put the security in with the building, make changes as needed. If security is done during the design stage, a better security system can be achieved at significantly lower costs. Although it may not be obvious, the basic principles of security are the same for OLTP and DSS.
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