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What is vertical fragmentation?
Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
what is meant semantic query optimization? how does it differ from other query optimization techniques?
Locks: Serialisabilty is just a test whether a given interleaved schedule is ok or has a concurrency related trouble. Though, it does not make sure that the interleaved concurrent
Briefly describe concurrency execution? Lock - based protocols Locks There are several modes in which a data item may be locked in this section we restrict our attention
1. Item based services will be charged fixed prices, and time-based will be charged variably depending on time. Such as per hour. Item-based: Fixed, pedicure, waxing, threading, fa
Explain Stand Alone Query Language in details? Stand alone Query Language - The query language that can be used interactively is known as stand alone query language. It does no
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
limitations and benefits in database tecknowlagy
brief history,definition,current trends and future trends if any of data fragmentation
Need For Distributed Database Systems A distributed database is a set of database kept on multiple computers that appears to applications as a one database. As a result, an app
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
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