Your own data sets

You can also use your own data sets to save data between transactions. This method probably has the largest overhead in terms of instructions processed, buffers, control blocks, and user programming requirements, but does provide extra functions and flexibility.

Not only can you define data sets as recoverable resources, but you can log changes to them for forward recovery. You can specify the number of strings for the data set, as well as on the temporary storage and transient data sets, to ensure against access contention, and you can use resource security.