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DBMS for Competitive Exams MCQs: Questions and Answers PDF Download
While an DDL operation acts on or refers to the object, it is protected by
- Encapsulation
- Encryption
- Locking
- Views log
Restricting data access and database activities is the responsibility of
- Data concurrency control
- Data access control
- Data atomicity control
- Data integrity control
Oracle Database acquires a DDL lock on behalf of?
- Explicit action
- Transaction
- Query
- Retrieval
The definition of a schema object is protected through
- Data dictionary lock
- Data declaration lock
- Data definition lock
- Data administrator lock
The data dictionary cache holds data in the form of
- Blocks
- Buffers
- Rows
- Columns
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- Complex selection predicates are of types
- If tuples are satisfying where predicate, then they are placed into groups by
- Widely used system for mapping Java objects to relations is called
- On top of any given set of actual relations, it is possible to support a large number of
- To specify that a normal join is to be used, a join clause can specify inner join instead of