then be seen in the initial state 230 and final state 235 of the table u201c car mpgs u201d the execution of the populated write instruction 225 causes a new entry to be inserted into the table having a first value of u201c compact u201d and a second value of u201c 35 u201d as desired the write operation datasource therefore allows the execution of write operations by read only applications fig3 is a high level representation of an illustrative database system 125 on which a write instruction datasource 110 may be implemented and utilized the read only application 100 may be operating on a separate computer system 103 and be operatively coupled to the database system 125 through a network 300 as discussed above the write instruction datasource 110 may be implemented utilizing one or more computing systems of varying configurations for instance the computing systems may be combined as a single computing system each computing system preferably includes computing components for executing computer program instructions and processes these components may include a central processing unit cpu 305 memory 310 input output i o devices 315 and a network interface 320 the cpu 305 processes and executes computer program instructions random access memory ram 310.