- What is an updatable view?
- What are the benefits of using a database?
- What is database and why we need it?
- Why are databases so fast?
- What are the features of database?
- Why do companies need databases?
- What is the advantage of view?
- What is database advantages and disadvantages?
- What is a database view and explain its advantages?
- What exactly is database?
- What are the disadvantages of database management system?
- What is the difference between database and file?
- Why do we use database?
- Why is database design so important?
- What is database and how it works?
- What is disadvantage of view in SQL?
- What are the advantages of using a database management system?
- Are databases faster than files?
What is an updatable view?
An updatable view is a special case of a deletable view.
A column of a view is updatable when all of the following rules are true: …
The view is deletable.
The column resolves to a column of a table (not using a dereference operation) and the READ ONLY option is not specified..
What are the benefits of using a database?
AdvantagesReduced data redundancy.Reduced updating errors and increased consistency.Greater data integrity and independence from applications programs.Improved data access to users through use of host and query languages.Improved data security.Reduced data entry, storage, and retrieval costs.More items…
What is database and why we need it?
A database is a collection of data, usually stored in electronic form. A database is typically designed so that it is easy to store and access information. … This is because the database stores all the pertinent details about the company such as employee records, transactional records, salary details etc.
Why are databases so fast?
A database is all about persistence (i.e storage). A database system is about storage, retrieval and updating of records and the medium exposed to achieve the above. … So you keep such data in memory which is faster than reading from disk.
What are the features of database?
Main Features of a DBMS· Low Repetition and Redundancy. In a database, the chances of data duplication are quite high as several users use one database. … · Easy Maintenance of Large Databases. … · Enhanced Security. … · Improved File Consistency. … · Multi-User Environment Support. … Hierarchical. … Network. … Relational.More items…•
Why do companies need databases?
Businesses use their databases to: Keep track of basic transactions. Provide information that will help the company run the business more efficiently. Help managers and employees make better decisions.
What is the advantage of view?
– Views are usually virtual and occupy no space. – They prevent undesired access by providing security as the data that is not of interest to a user can be left out of the view. – Display different data for different types of users.
What is database advantages and disadvantages?
Increased costs one of the disadvantages of dbms is Database systems require sophisticated hardware and software and highly skilled personnel. The cost of maintaining the hardware, software, and personnel required to operate and manage a database system can be substantial.
What is a database view and explain its advantages?
Views can provide advantages over tables: Views can represent a subset of the data contained in a table. Consequently, a view can limit the degree of exposure of the underlying tables to the outer world: a given user may have permission to query the view, while denied access to the rest of the base table.
What exactly is database?
A database is an organized collection of structured information, or data, typically stored electronically in a computer system. A database is usually controlled by a database management system (DBMS). … Most databases use structured query language (SQL) for writing and querying data.
What are the disadvantages of database management system?
Disadvantages of DBMS are explained as following below.Increased Cost: These are different types of costs:Complexity: … Currency Maintenance: … Performance: … Frequency Upgrade/Replacement Cycles:
What is the difference between database and file?
A data file is a collection of related records stored on a storage medium such as a hard disk or optical disc. A Student file at a school might consist of thousands of individual student records. … A database is a collection of data organized in a manner that allows access, retrieval, and use of that data.
Why do we use database?
– Databases let us work with large amounts of data efficiently. They make updating data easy and reliable, and they help to ensure accuracy. They offer security features to control access to information, and they help us avoid redundancy.
Why is database design so important?
A database design is said to be good, if its queries are simple and execution is faster. The database design is credited if the database design is good enough. The most important feature of a good database design. If it is a well designed database, it can be maintained well otherwise it might lead to many problems.
What is database and how it works?
A database is a software-based container structured to collect and store information so it can be retrieved, added to, updated or removed in an automatic fashion. … The columns identify the data (attributes) in the table, and the rows are the records of information.
What is disadvantage of view in SQL?
Although there are many advantages to views, the main disadvantage to using views rather than real tables is performance degradation. Because views only create the appearance of a table, not a real table, the query processor must translate queries against the view into queries against the underlying source tables.
What are the advantages of using a database management system?
There are several advantages of database management systems. Chief among them are data redundancy and consistency, data sharing, integrity restrictions, and greater security.
Are databases faster than files?
As a general rule, databases are slower than files. If you require indexing of your files, a hard-coded access path on customised indexing structures will always have the potential to be faster if you do it correctly. But ‘performance’ is not the goal when choosing a database over a file based solution.