A deadlock is a situation in which two or more users are waiting for data locked by each other. Deadlocks prevent some transactions from continuing to work. Oracle Database automatically…

The central set of read-only reference tables and views of each Oracle database is known collectively as the data dictionary. Overview of the Data Dictionary An important part of an…

Purpose: Use a constraint to define an integrity constraint—a rule that restricts the values in a database. The Oracle server uses constraints to prevent invalid data entry into tables. You…