Covering All Your Databases
A database is simply a collection of information. The information is usually divided into records that may be simple or complex. There may be a handful of records, or a few dozen. Or there may be thousands or millions of records.
Each record in a database may be a single word, or it may comprise a number of fields. These fields may be self-contained data, or they may be keys to another database. A record may be one or more lines in a file, or an entire file by itself.
The /etc/passwd file on a Unix system is a database containing one record for each user. Each record contains seven fields, separated by colons. ...