Ü  Difference between CHAIN and READC

·         If there are huge number of records in subfile, READC always leads the race against CHAIN on the scale of CPU time.

·         It is better to go for READC if the application is running over the internet.

·         Looping can be performed for READC to read all the changed record on the subfile, which CHAIN can be done only once, repetition is not allowed in case of CHAIN.

·         CHAIN on a subfile is useful when we want to search the record based on RRN value.