Architecture
Berkeley DB has an architecture notably simpler than that of other database systems like relational database management systems. For example, like SQLite, it does not provide support for network access — programs access the database using in-process API calls. Oracle added support for SQL in 11g R2 release based on the popular SQLite API by including a version of SQLite in Berkeley DB. There is third party support for PL/SQL in Berkeley DB via a commercial product named Metatranz StepSqlite.
A program accessing the database is free to decide how the data is to be stored in a record. Berkeley DB puts no constraints on the record's data. The record and its key can both be up to four gigabytes long.
Despite having a simple architecture, Berkeley DB supports many advanced database features such as ACID transactions, fine-grained locking, hot backups and replication.
Read more about this topic: Berkeley DB
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