Oracle DBA | Query Processing | Query Optimization | Query Processor | DBA Management Lecture 5 скачать в хорошем качестве

Oracle DBA | Query Processing | Query Optimization | Query Processor | DBA Management Lecture 5

Statement that request the retrieval of data or information is called query When we asked some thing from google ore dbms we make query to do so. We access or retrieve data from database through query. Query is written in high level language calculus form or input in a calculas query and output language based on lower level relational dbms output in algebraic query. Query processor transform the calculas query into algebraic query. This transformation and some other steps are Part of query processing. This conversation must be correct and efficient. In query processing and query optimization we must convert the query in the form that response time must be low and take less space for processing. In this lecture we discuss different query processing elements, problems in query processing. Query processor and characteristics of query processor, languages, types of optimization, statistics decisions sites, explanations of network topology, explanation of replicated fragments, use of semi joins I hope this lecture will increase your knowledge about the query and database management system. Remember us in your prayers and stay tune with our channel "techno learn" for further knowledge