s If the data dictionary contains only some statistics, then the cost-based approach is still used, but the optimizer must guess the statistics for the subjects without any statistics. This can result in suboptimal execution plans. s If the data dictionary contains no statistics for any of the...
■ Ever-expanding and increasingly dynamic end-user communities demand that information and applications be accessible not only to employees, but to vendors, partners, and customers as well. Traditional efforts to provide access require maintaining individual user accounts within the organization, leading...