Insertions and deletions involve processing the whole file. One has to read and write them linearly and sequentially, because the concept does not require records to be sorted or even to be keyed. This relates to how one accesses flat file databases. One might encounter terms such as Basic Sequential Access Method (BSAM) and Queued Sequential Access Method (QSAM) bandied about in the literature when discussing this. The file may comprise fixed length records, with fields denoted by column positions, or variable length records, with records and fields separated from one another by delimiter characters.The structure is not relational, hierarchical, or networked.It is a database that comprises exactly one table in one file.In the context of databases, a flat file database satisfies the following:
Dirkt is right to ask for context, but is very wrong about flat files not being databases or containing records.
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