AR-column

Column Family What is a Column family? A column family is a database object that contains columns of related data. Each column is a tuple (triplet) consisting of a column name, a value, and a timestamp. In a relational database table, this data would be grouped together within a table with other non-related data. How to use.1. Download HP Reveal.2. Scan QR Code.3. Shine pictures with symbol.

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objectiveØ To explain about what is column family.Ø To construct to use NoSQL column databases.Ø To explain how to use AR (Augmented Reality).

The basic components of a column family database are the data structures developers deal with the most.These are the data structures that developers define explicitly, such as a column. The terms described in thissection include. Row Key Key space A row key uniquely identifies A keys pace is the top-level data struc a row in a column family. It ser ture in a column family database, It is to ves some of the same purposes p level in the sense that all other data s as a primary key in a relational tructures you would create as a databas database e designer are contained within a key sp ace. A key space is analogous to a schem Column Families a in a relational database. Typically, you will have one key space for each of your Column families are collections of related applications.columns. Columns that are frequently usedtogether should be grouped into the same Columncolumn family. For example, a customer’s address information, such as street, city, state, A column is the data structure for storingand zip code, should be grouped together a single value in a database. Depending on tin a single column family. he type of column family database you are using, you might find values are represented simply as a string of bytes. This minimizes t he overhead on the database because it doe s not validate data types. HBase takes this approach.

Question• What is a Column family? A column family is a database object that contains columns of related data. Each column is a tuple (triplet) consisting of a column name, a value, and a timestamp. In a relational database table, this data would be grouped together within a table with other non-related data.• What if I want to sort by column value and by column name? Then you have two Column Families, one sorted by whatever datatype your column names are, and one sorted by whatever your column values are.• What is Key space? A keys pace is the top-level data structure in a column family database• Can the super column name and column name be sorted differently? Yes.• Do the column names have to be the same for each Super Column? No.• What is Apache Cassandra? Apache Cassandra is an open source, distributed and decentralized/distributed storage system (database), for managing very large amounts of structured data spread out across the world. It provides highly available service with no single point of failure.

Referenceshttp://apprize.info/data/nosql/12.html[https://www.youtube.com/watch?v=nBXDdum0K][https://www.youtube.com/watch?v=qUV2j3XBRHc]https://www.tutorialspoint.com/cassandra/cassandra_introduction.htm Name: Nusula Alisu ID student: 582431005