Query processor in database management system, Database Management System

Assignment Help:

Query Processor

The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form the DBMS can know. The query language processor commonly consists of two separate elements: the parser or the query optimizer.

The parsers receive query language statements to the command-line utilities or application programs and study the syntax of the statements to make sure they are right. To do this, the parsers splits a statement down into primary units of syntax and study them to make sure each statement consists of the proper component elements. If the statements follow the syntax rules, the tokens are approved to the query optimizer.

The query optimiser displays the query language statement, and tries to selected the best and most efficient way of implementing the query. To do this, the query optimizer will make various query plans in that operations are performed in dissimilar orders, and then try to compute taht plan will implement most efficiently. While making this estimation, the query optimizer might show factors like as: disk time, network time, CPU time, scanning methods or sorting methods.

 


Related Discussions:- Query processor in database management system

aggregate functions-data manipulation language, Aggregate functions ...

Aggregate functions Some of these functions are min, count, max, and avg. These functions help in getting consolidated information from a set of tuples. Example:

What is sql?, What Is Sql?  Structured Query Language (SQL) is a standa...

What Is Sql?  Structured Query Language (SQL) is a standard query language. It is usually used with all relational databases for data manipulation and definition. All the re

Primary interface between a visual basic application, Question (a) Visu...

Question (a) Visual Basic is governed by an event processor. Explain the meaning of this phrase. (b) Differentiate between an general procedure and event procedure. (c)

Lock, lock and types of lock

lock and types of lock

.DBMS, please describe the data base management with the easy example &giv...

please describe the data base management with the easy example &give the application?

Foreign keys , Foreign Keys and NULL Let us take the relation:         ...

Foreign Keys and NULL Let us take the relation:                 DEPT DEPT ID DNAME BUDGET D1 M

What is the meaning of redundant associations, Adding Redundant Association...

Adding Redundant Associations for Efficient Access The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a

Database schemas and dependencies, 1. Staff(staffID, firstName, lastName, a...

1. Staff(staffID, firstName, lastName, availabilityID, experience, phone, mobile, email); 2. Availability(availabilityID, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday,

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd