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Describe Hashing in DBMS?
Hashing: Hashing is a technique to store data within an array so which storing, searching, inserting and deleting data is fast (in theory it's O(1)). For this every record requires an unique key.
The primary idea is not to find for the correct position of a record along with comparisons but to compute the position inside the array. The function which returns the position is known the 'hash function' and the array is called a 'hash table'.
Creating a view: A query can be embedded within the CREATE VIEW STATEMENT A query can have complex select statements containing join, groups and sub- queries A quer
Support by Adding Indexes Multiple indexes can be used to access a data file by multiple access paths. In such a scheme only single copy of the data is consider, only the numbe
What is Relational Algebra? Relational algebra is a Procedural query Language?
Given the following relations Vehicle (Reg_no, make, colour) Person(eno, name, address) Owner(eno, reg_no) Write expressions in the relational algebra to answer the following
Increased overheads on update : On the drawbacks side, it will need the system to ensure that all replicas of a relation are consistent. This shows that all the replicas of the rel
Project Description: This is going to be a School portal to handle each activities in school such as, School fees payment, online registration and every other payment, course re
#explain five disadvantages of a dbms..
Describe the various types of Online Analytical Processing (OLAP) tools and briefly discuss how the support common analytical operations.
WHAT IS DSS? WRITE ITS REQUIREMENTS.
why are older data base model are being replaced by new data model
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