| Data _______ occurs when the same data is duplicated in multiple files of a database. | Redundancy |
| To analyze unstructured data, such as memos and legal cases, you would use text mining tools. | True |
| Which of the following is not a DBMS for midrange computers: | Microsoft Access |
inconsistency. Which of the following features enables a DBMS to reduce data redundancy and inconsistency? physical database available for different logical views.
Which of the following is an automated or manual file that stores information about data elements and data characteristics?
The third element of a DBMS is a data dictionary. This is an automated or manual file that stores definitions of data elements and data characteristics, such as usage, physical representation, ownership (who in the organization is responsible for maintaining the data), authorization, and security.
Is a field in a table which uniquely identifies each entity instance in a database?
A primary key is a field in a table which uniquely identifies each entity instance (row) n a database.
What type of database is Microsoft SQL Server?
Microsoft SQL Server is a relational database management system (RDBMS) that supports a wide variety of transaction processing, business intelligence and analytics applications in corporate IT environments.
What is primary key in relational DBMS?
A primary key is a column or a set of columns in a table whose values uniquely identify a row in the table. A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table.
Which operations are used in a relational DBMS?
- Select Operation: The select operation selects tuples that satisfy a given predicate. …
- Project Operation: This operation shows the list of those attributes that we wish to appear in the result. …
- Union Operation: …
- Set Intersection: …
- Set Difference: …
- Cartesian product. …
- Rename Operation:
Which of the following database types would be best suited for storing multimedia?
Which of the following database types would be best suited for storing multimedia? NoSQL DBMS.
What is the logical view of a database?
The logical database view is how the data appear to the user to be stored. This view represents the structure that the user must interface with in order to extract data from the database.
Is a database that stores current and historical data of potential interest to decision makers throughout the company?
A data warehouse is a database that stores current and historical data of potential interest to managers throughout the company.
Which of the following is a database management software for desktop computers?
MICROSOFT ACCESS is a Database Management System offered by Microsoft. It uses the Microsoft Jet Database Engine and comes as a part of the Microsoft Office suite of application.
What is a field in database?
In a database table, a field is a data structure for a single piece of data. Fields are organized into records, which contain all the information within the table relevant to a specific entity. … The records make up the table rows and the fields make up the columns.
What is not a relational database?
A non-relational database is a database that does not use the tabular schema of rows and columns found in most traditional database systems. Instead, non-relational databases use a storage model that is optimized for the specific requirements of the type of data being stored.
What is used to uniquely identify each record in a table?
Primary Key – a field containing a value that uniquely identifies each record in a table.
Which one of the following allows us to uniquely identify the entity in the entity set?
Keys. An important constraint on an entity is the key. The key is an attribute or a group of attributes whose values can be used to uniquely identify an individual entity in an entity set.
What is SQL database?
SQL Server includes the following system databases. Records all the system-level information for an instance of SQL Server. Is used by SQL Server Agent for scheduling alerts and jobs. Is used as the template for all databases created on the instance of SQL Server.
What is a database in SQL Server?
A database in SQL Server is made up of a collection of tables that stores a specific set of structured data. A table contains a collection of rows, also referred to as records or tuples, and columns, also referred to as attributes.
What is primary key in DBMS with example?
A primary key is a column — or a group of columns — in a table that uniquely identifies the rows in that table. For example, in the table below, CustomerNo, which displays the ID number assigned to different customers, is the primary key.
What is System database in SQL Server?
System databases are defined by Microsoft and are needed for SQL Server to operate. These databases include Master, Model, MSDB, TempDB, Resource, Distribution database used in replication as well as the ReportServer and ReportServerTempDB databases used for Reporting Services.
What is multiple key access in DBMS?
Multiple Key Accesses. To handle above situation, multiple key accesses are introduced. Here, we use combination of two or more columns which are frequently queried to get index. In the above example, both DEPT_ID and SALARY are clubbed into one index and are stored in the files.
What is the common name of primary key and alternate key?
A super key is a combine form of Primary Key, Alternate key and Unique key and Primary Key, Unique Key and Alternate Key are subset of super key.
Which operations are used in a relational DBMS Mcq?
- FULL UNION operation.
- JOIN UNION operation.
- OUTER UNION operation.
- INNER UNION operation.
What is relational operator in SQL?
A comparison (or relational) operator is a mathematical symbol which is used to compare two values. The result of a comparison can be TRUE, FALSE, or UNKNOWN. SQL Assignment operator. In SQL the assignment operator ( = ) assigns a value to a variable or of a column or field of a table.
What does a relational database consist of?
A relational database is a collection of data items with pre-defined relationships between them. These items are organized as a set of tables with columns and rows. Tables are used to hold information about the objects to be represented in the database.
How is a database different from a database management system DBMS )?
What is the difference between Database and Database management system? Database is a collection of interrelated data. Database management system is a software which can be used to manage the data by storing it on to the data base and by retrieving it from the data base.
Which of the following is a type of optical drive storage?
There are three main types of optical media: CD, DVD, and Blu-ray disc. CDs can store up to 700 MB (megabytes) of data, and DVDs can store up to 8.4 GB (gigabytes) of data. Blu-ray discs, which are the newest type of optical media, can store up to 50 GB of data.
How many logical views can a database support?
A database can support up to three logical views.
What is the logical view of data quizlet?
The logical view of data is: How people organize, view, and understand relationships among data items. A schema is defined as: description of data elements in a database, relationships among them, and logical model used to organize and describe data.
What is OLAP used for?
OLAP (for online analytical processing) is software for performing multidimensional analysis at high speeds on large volumes of data from a data warehouse, data mart, or some other unified, centralized data store.
What are the relationships that the relational database is named for?
In a relational database, all data are stored and accessed via relations. Relations that store data are called “base relations“, and in implementations are called “tables”.
What is logical database and physical database?
A logical database must be able to access and identify all files within the storage system to operate correctly, whereas a physical database manages a much smaller field of information. Sometimes, a physical database stores only a single file with one value or word in it.
What hosts a DBMS?
Database management systems are usually installed and reside on backend servers. The hardware machine that hosts a database management system is called a database server. There is a connection established between a database server and other software application that access data via APIs and services.
Is a language associated with a database management system that end users and programmers use to manipulate data in the database?
A data dictionary is a language associated with a database management system that end users and programmers use to manipulate data in the database. In a relational database, complex groupings of data must be streamlined to eliminate awkward many-to-many relationships.
What is relational and nonrelational database?
To summarize the difference between the relational and non-relational databases: relational databases store data in rows and columns like a spreadsheet while non-relational databases store data don’t, using a storage model (one of four) that is best suited for the type of data it’s storing.
What are multiple relational data tables?
The RDBMS can create multiple tables in the database. It can connect in various ways. The one-to-one, many-to-many, one-to-many relation can create connections into more than two tables.
What are the types of relational database?
A Review of Different Database Types: Relational versus Non-Relational. Relational databases are also called Relational Database Management Systems (RDBMS) or SQL databases. Historically, the most popular of these have been Microsoft SQL Server, Oracle Database, MySQL, and IBM DB2.
What are the three popular DBMS software?
- Oracle.
- MySQL.
- SQL Server.
- PostgreSQL.
- IBM DB2.
- Microsoft Access.
- SQLite.
- MariaDB.
What is the most popular database software?
- MySQL. Rank: 1. About: MySQL is one of the most popular Open Source SQL database management systems. …
- PostgreSQL. Rank: 2. …
- Microsoft SQL Server. Rank: 3. …
- SQLite. Rank: 4. …
- MongoDB. Rank: 5. …
- Redis. Rank: 6. …
- MariaDB. Rank: 7. …
- Oracle. Rank: 8.
What is the most popular SQL database?
Today, MySQL is one of the most popular and widely used SQL databases. It is also one of the most used databases in Web Applications. Some of the world’s largest Web-Scale applications (e.g., Facebook, Uber) uses MySQL.
What is field in database give an example?
1) In a database table, a field is a data structure for a single piece of data. … For example, in a table called customer contact information, telephone number would likely be a field in a row that would also contain other fields such as street address and city.
How many fields are there in database?
What database field types would she define? Here there are 2 database fields: items-purchased, and. cost-per-item.
What are the field names in database?
Field names are the names you give to the columns in a table. The names should indicate what data is contained in each column. For example, when you create a feature class in ArcCatalog, the table is prepopulated with an Object ID field and a shape field.