The primary method used by CA IDMS/DB Audit to access a user's database is sweep processing. Using sweep processing, CA IDMS/DB Audit starts retrieving the records in an area defined by the subschema. It retrieves all records according to AREA, SET, and RECORD parameter statements. After a record is retrieved, CA IDMS/DB Audit refers to the parameters you specify to determine how to audit the record and its sets.
Page headers and footers are also audited during sweep processing if you specify the PAGES option in the AUDIT statement. When CA IDMS/DB Audit retrieves a new page during sweep processing, it examines the header and footer before looking at the records on the page.
During sweep processing, CA IDMS/DB Audit retrieves records within an area by db-key, in numerical order. For example, in Figure 2.33, assume that the DEPT-REGION area, DEPT and TEACHER record types, and DEPT-TEACHER sets have been copied into the subschema. When sweeping the DEPT-REGION area, the records HISTORY, Harry Dean, ENGLISH, Carol Smith, and John Doe will be retrieved in that order.
Figure 2.33: Sweep Processing
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