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Глоссарий терминов Oracle

    UNIQUE index
    Перевод индекс UNIQUE (индекс по уникальному ключу)
    Описание Guarantees that no two rows of a table have duplicate values in the key column (or columns). Nonunique indexes do not impose this restriction on the column values. Identification key logging enables database-wide before-image logging of primary keys or unique indexes (in the absence of primary keys) for all updates. If a table does not have a primary key, but has one or more non-null unique key constraints, one of the constraints is chosen arbitrarily for logging as a means of identifying the row getting updated. See NONUNIQUE index.