Oracle RDBMS is a proprietary DBMS released by Oracle Corporation.
In 1977, Larry Ellison, Robert Miner, and Ed Oates founded Software Development Laboratories, which was hired by the United States Central Intelligence Agency (CIA) in order to write a new database system based upon SQL. This system came to be known as Oracle. The company changed its name to Relational Software, Inc. in 1979 and then to Oracle Systems Corporation in 1982.
Oracle employs MVCC for concurrency control.
Oracle supports isolation levels of read committed as well as serializable, defaulting with the latter. There is an additional mode available, "read only", which is not part of the SQL standard.
Stored procedures are supported by Oracle.
Oracle was originally designed as a relational DBMS. It now also supports a variety of data models for storage.
Oracle supports compression at multiple levels within the data, including by row, block, and index. It also supports network compression designed to reduce bandwidth usage and increase network throughput.