Mainframe Interview Questions

 -1 indicates the field is null

 0 indicates the field is not null

 -2 indicates the field is truncated

Autostatus is a protocol mode which causes the expansion of each DML statement to include a 'perform IDMS-Status' statement.

There are some differences:

COBOL II supports structured programming by using in line Performs and explicit scope terminators. It introduces new features (EVALUATE, SET. TO TRUE, CALL BY CONTEXT, etc). It permits programs to be loaded and addressed above the 16-megabyte line .  It does not support many old features (READY TRACE, REPORT-WRITER, ISAM, etc.). It offers enhanced CICS support.

You must code EXEC CICS ASSIGN with the OPENID option.

If any one want to restrict Trans-ID to single user, enter trans-id with ENQ. It won't allow any one else to use the same trans-id.

No. The mode is specified via the SYSCTL DD card in the JCL.

They communicate via service MVS request calls.

Because SALARY is not declared to have NULLs and the employees for whom the salary is not known are also counted.