Database Operations in HIVE Using CLOUDERA - VMWARE Work Station

We are going to create a database and create a table in our database. And will cover Database operations in HIVE Using CLOUDERA - VMWARE Work Station. Let's discuss one by one.

Introduction:

• Hive is an ETL tool that provides an SQL-like interface between the user and the Hadoop distributed file system which integrates Hadoop.
• It is built on top of Hadoop.
• It facilitates reading, writing, and handling wide datasets that stored in distributed storage and queried by Structure Query Language (SQL) syntax.

Requirements:

• Need to install Cloudera - vmware workstation.
• Link to download for windows -https://www.cloudera.com/downloads.html

Cloudera:

Cloudera enables you to deploy and manage Apache Hadoop, manipulate and analyze your data, and keep that data secure and protected.

Steps to Open Cloudera after Installation

Step 1: On your desktop VMware workstation is available. Open that.

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Step 2: Now you will get an interface. Click on open a virtual device.

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Step 3: Select path - In this step, you have to select the path and file where you have downloaded the file.

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Step 4: Now your virtual environment is creating.

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Step 5: You can view your virtual machine details in this path.

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Step 6: Now open the terminal to get started with hive commands.

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Step 7: Now type hive in the terminal. It will give output as follows.

[cloudera@quickstart ~]$ hive
2020-12-09 20:59:24,314 WARN [main] mapreduce.TableMapReduceUtil: 
The hbase-prefix-tree module jar containing PrefixTreeCodec is not present. Continuing without it.
Logging initialized using configuration in file:/etc/hive/conf.dist/hive-log4j.properties
WARNING: Hive CLI is deprecated and migration to Beeline is recommended.
hive> 

Step 8: Now, you are all set and ready to start typing your hive commands.

Database Operations in HIVE

1. Create a database

Syntax:

create database database_name;

Example:

create database geeksportal;

Output:

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2. Creating a table

Syntax:

create database.tablename(columns);

Example:

create table geeksportal.geekdata(id int,name string);

Here id and string are the two columns.

Output :

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3. Display Database

Syntax:

show databases;

Output: Display the databases created.

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4. Describe Database

Syntax:

describe database database_name;

Example:

describe database geeksportal;

Output: Display the HDFS path of a particular database.

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