Generation Data Groups track historical iterations of datasets using relative naming notation (e.g., G0001V00 mapped as (+1) or (0) ).
: A mandatory structure included via EXEC SQL INCLUDE SQLCA END-EXEC . It reports execution success or failure through the SQLCODE variable. SQLCODE = 0 : Execution completed successfully.
Access Method Services; creates, alters, and deletes VSAM and non-VSAM structures. DEFINE CLUSTER (NAME(VSAM.KSDS) ...)
In a conversational model, a program stays active in memory while a user types, locking system resources. CICS fixes this inefficiency using :
In-depth review of online transaction processing, screen designing (BMS maps), and command-level programming.
[User Terminal] [CICS System Environment] | | |------- 1. Trans ID (Direct) ------>| (Starts Program A) | | |<------ 2. Sends Screen Map --------| (Program A saves state in DFHCOMMAREA | & Terminates Task | and ends execution) | | (User types data) | | | |------- 3. Presses Enter ------------>| (CICS reads saved state, restarts | | Program A or invokes Program B)
This is often considered the most valuable chapter in Part 2. Muthu breaks down Virtual Storage Access Method (VSAM) into digestible components.
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Generation Data Groups track historical iterations of datasets using relative naming notation (e.g., G0001V00 mapped as (+1) or (0) ).
: A mandatory structure included via EXEC SQL INCLUDE SQLCA END-EXEC . It reports execution success or failure through the SQLCODE variable. SQLCODE = 0 : Execution completed successfully.
Access Method Services; creates, alters, and deletes VSAM and non-VSAM structures. DEFINE CLUSTER (NAME(VSAM.KSDS) ...)
In a conversational model, a program stays active in memory while a user types, locking system resources. CICS fixes this inefficiency using :
In-depth review of online transaction processing, screen designing (BMS maps), and command-level programming.
[User Terminal] [CICS System Environment] | | |------- 1. Trans ID (Direct) ------>| (Starts Program A) | | |<------ 2. Sends Screen Map --------| (Program A saves state in DFHCOMMAREA | & Terminates Task | and ends execution) | | (User types data) | | | |------- 3. Presses Enter ------------>| (CICS reads saved state, restarts | | Program A or invokes Program B)
This is often considered the most valuable chapter in Part 2. Muthu breaks down Virtual Storage Access Method (VSAM) into digestible components.
