5. OPERATION › 5.1 Operation Overview › 5.1.3 VSAM/ICF Catalog Scan Overview

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5.1.3 VSAM/ICF Catalog Scan Overview


VCC performs the catalog scan by using a variable number of
subtasks.  Catalog scan is composed of a single catalog scan
control subtask (VCCVCNTL) and up to 32 (selectable by the
VSAMSUBT parameter) catalog scan (VCCVSCAN) subtasks of
VCCVCNTL.  The VSAM/ICF catalog scan is comprised of the
following modules:

    1 - VCCVCNTL--ICF/VSAM Catalog Scan Control
    2 - VCCVSCAN--ICF/VSAM Catalog Allocation and Routing
    3 - VCCVVSAM--VSAM Catalog Scan
    4 - VCCVBCS--ICF Catalog Scan
    5 - VCCVVDS--ICF/VSAM Volume Data Set Scan