Hive - Create Database

In Hive, the database is considered as a catalog or namespace of tables. So, we can maintain multiple tables within a database where a unique name is assigned to each table. Hive also provides a default database with a name default.

• Initially, we check the default database provided by Hive. So, to check the list of existing databases, follow the below command: -

1. hive> show databases;  

Here, we can see the existence of a default database provided by Hive.

• Let's create a new database by using the following command: -

1. hive> create database demo;  

So, a new database is created.

• Let's check the existence of a newly created database.

1. hive> show databases;  

• Each database must contain a unique name. If we create two databases with the same name, the following error generates: -

• If we want to suppress the warning generated by Hive on creating the database with the same name, follow the below command: -

1. hive> create a database if not exists demo;  

• Hive also allows assigning properties with the database in the form of key-value pair.

1. hive>create the database demo  
2.         >WITH DBPROPERTIES ('creator' = 'Gaurav Chawla', 'date' = '2019-06-03');   

• Let's retrieve the information associated with the database.

1. hive> describe database extended demo;