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Referential Integrity ensures that foreign keys correctly map to primary keys. A referential constraint prevents the insertion or update of foreign keys for which there are no matching primary keys. It either prevents the deletion of primary keys if foreign keys exist, or deletes these foreign rows (DELETE CASCADE).
A major functional part of Oracle. Responsible for the parsing and optimization of SQL requests, controls query plan execution, and processes row sets from the storage engine.
SQL *net is the Oracle network interface that allows Oracle tools running on network workstations and servers to access, modify, share, and store data on other servers. SQL *net is considered part of the program interface in network communications.
I/O operation in which multiple disk blocks are read and scattered into different discontinuous buffers in the SGA. This is typical of the I/O that results from performing operations that require processing large amounts of data, such as full table scans, sorting, or Oracle Parallel Queries (OPQs).
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