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CUT6 12.6

Computers: Understanding Tech 6e 12.6

database administration An important IT function that involves operating and maintaining the database system.
database administrator (DBA) The person who handles the daily database operations, including installing and upgrading the database, ensuring rapid response times, integrating security strategies, and completing regular data backups.
downtime Time in which a system is unavailable.
data corruption A serious failure that occurs when data is unreadable, incomplete, or damaged.
backup and recovery plan A plan developed by a database administrator to ensure frequent data backups. It enables the administrator to recover the data in the event of a data loss.
database response time The lag time between a user issuing a command and the database system taking action.
record locking A situation that occurs when multiple users attempt to edit an existing record, automatically preventing changes to be written to the database as a safety precaution. The DBMS only allows one user at a time to alter a record.
data integrity A term that describes the accuracy of the information provided to database users. Sometimes called data quality.
redundancy The duplication of one or more fields of data in multiple tables.
normalization The process of structuring a database to avoid redundancy (duplication of entries) and undesirable dependencies (relationships between entries).
data contamination A ripple effect caused by an error in the system. It involves the spread of incorrect information and can have serious consequences.
data validation Techniques that ensure that users enter correct and complete data into the system.
referential integrity Involves making sure that the records entered into tables remain consistent with the relationships between the tables.
range check A simple error-checking system usually performed on numeric data entries.
alphanumeric check A data validation check that allows only letters of the alphabet and digits to be entered.
consistency check A data validation check made against previously entered data that has already been validated.
completeness check A data validation check that ensures that every required field in a record contains an entry.
Created by: softcrylic