The FSA uses a scanned file database (also known as the 'scan database') to track the status of each file in a scanning job. For each scanned file, the database contains a hash to uniquely identify that version of the file plus its 'last scanned' date.
For scheduled scanning jobs, the FSA checks the hashes in the scanned file database to determine whether a file has changed or moved since the last scan. This allows the FSA to skip files which have not changed.
Similarly, if a scanning job gets interrupted (that is, it cannot finish scanning all the required files because, for example, there is a network or system failure), when the job next runs the FSA checks the hashes in the database and skips any files which have not been modified since they were last scanned.
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