The all about some very basics of ISPF key points, highly useful if you are a new to mainframe ISPF or an existing mainframe programmer. Read more.
CLIST is an interpreted language. CLISTs can be run in background (by running JCL which executes the TSO control program (IKJEFT01)). Read more with examples.
The simple way to split a data set in mainframe using DFSORT. Read more for examples.
COMPUTE in COBOL is the best keyword you can use it in calculation. The syntax explained here simplified way you can use it. Read more.
How and when to use GU and GHU calls is perfectly needed to write logic in IMS DB programs. Read more.
Really the best COBOL tutorial help you go thorough quickly to write programs and prepare for interview.
The COBOL mainframe programmer salary is given here from Payscale reference. Just this is a guideline for mainframe programmers.