Design patterns for pre initialize data for one task

I have working on developing scheduling application as a start up and application take some time to complete. during the scheduling process I cannot use service calls to load data, because it will reduce the performance. It may cause to terminate the process if data access failed.

So I need to load required data before scheduling process star and discard that data after completing the schedule. This is some kind of caching but it doesn't need all the features in caching like check for expiries, discard expiries update new changes etc. Need to load once a month only for the scheduling.

So can somebody tell me what is the best design pattern to handle that situation. Thanks