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Describe Query evaluation engine?
Query Evaluation engine: Vehicle executes low-level instructions obtained through the DML compiler.
The Storage Manager Components gives interface among the low level data stored in the database and application programs and queries submitted to the system. It is central software element of DBMS and known as database control system also.
how to prepare a data dictionary for online examination system for certified courses?
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
What is the meaning of Data independence? Data independence means a programs that are not dependent on the physical attributes of data and a programs that are not dependent on
Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
Law Associates is a large legal practice based in Sydney. You have been asked to design a data model for the practice based upon the following specification: The practice employs
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
Gaps in sequence values can happen when: - A rollback happens that is when a statement changes are not accepted. - When the system crashes - When a sequence i
What is called a query -execution engine? The query implementation engine takes a query evaluation plan, implements that plan, and returns the answers to the query.
Consider the subsequent relations for a database which keeps track of business trips of salespersons in a sales office: SALESPERSON (SSN, Name, start_year, Dept_no) TRIP (SSN, Fr
What is a block and a block number? A block is a contiguous sequence of sectors from a single track of one platter. Every request specifies the address on the disk to be refere
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