Functions of Database Management Systems. Data storage retrieval and update facilities A user-accessible catalogue or data dictionary Support for shared update Backup and recovery services Security services Integrity services Connectivity Utilities. Support for Logical Transactions.
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1. Backups or Saves (normal backup of DB files)
2. Journaling / Audit trail / Audit file
4. Authorisation Levels
*Customer numbers must be numeric,
* Credit Limits must be £300, £500 or £1000 only,
* The sales rep for a given customer must exist,
* No customer may be deleted if he/she currently has an order on file.