Database size Query and update times deteriorate markedly as database size increases. Query response times do not deteriorate markedly as database size increases. Fast database performance, irrespective of number of records.
Database administrators have to select fields in advance to index to satisfy user queries.
Indexing all of the fields causes significant performance and disk space problems. All the fields in a database, no matter how many, may be indexed. All fields available for ad-hoc queries. DBA not required to continually add and drop indices to satisfy user needs. Fast response ensures user satisfaction.