Definitions for "Rollback segment"
Logical database structure created by the database administrator to temporarily store undo information. Rollback segments store old data changed by SQL statements in a transaction until it is committed. See Also: commit, logical structures, segment
a collection of extents that holds rollback data for rollback transactions, read-consistency, and database recovery
a database object that stores a transaction's changes before they are committed
(Parallel Server Setup and Configuration Guide; search in this book)