Optimize Cobol Program this Way (1 of 2)

This is the time to focus all developers to stay high on technical skills. Especially many have got a procrastination on further Cobol learnings.

Feeling is I already done. But, in reality many changes are taking place everyday.

Yes, why I am focussing is, people who continually working in the same project, this is clearly visible that – less focus on program optimization.

These stuff we always need to consider:

  • Compiler option OPTIMIZE=STD or FULL will take less run time for your object program
  • If DB2/IMSDB is using in your program then always use OPTIMIZE=FULL, else STD is enough. Default is NOOPT
  • Always use top-down approach in program construction
  • Remove all unused variables in your program
  • Use perform statements wherever needed
  • Use Arrays, so that we can avoid many variables
  • Use effectively REDEFINES
  • Use INDEXED BY
  • Use EVALUATE instead of IF-ELSE-END-IF, when more conditions involved
  • Last but not least, these five ways we always need to consider, while writing a Cobol program. 
    • Runtime Efficiency
    • Module Size Efficiency
    • Compile Efficiency
    • Input/Output Efficiency
    • Maintenance Efficiency
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Author: Srini

Experienced software developer. Skills in Development, Coding, Testing and Debugging. Good Data analytic skills (Data Warehousing and BI). Also skills in Mainframe.