PRS Issues

• Complexity

• Absence of Functions (Version 1)

• Efficiency

Notes:

• Complexity- implementation
  

• early and late evaluation.

• Some rules cannot be activated late.

• Restrictions on rule interaction.

• Functions: view support

• protection

• referential integrity

• integrity constraints

• Efficiency:

• Markers: rule-id 6 byte

• priority 1 byte

• marker-type 1 byte

• B+-trees used to store interval data

• To reduce marker overhead, implement markers at the physical block level