You typically create a database during Oracle Database software installation.
However, you can also create a database after installation.
Run If this is your first foray into the wonderful world of Distributed Computing, then you are in for some interesting times.
First off, distributed systems are hard; making a distributed system hum requires a disparate skillset that spans systems (hardware and software) and networking.
Herein you will find either the definitive documentation on an HBase topic as of its standing when the referenced HBase version shipped, or it will point to the location in Javadoc or JIRA where the pertinent information can be found. The source for this guide can be found in the _src/main/asciidoc directory of the HBase source.
This reference guide is marked up using Ascii Doc from which the finished guide is generated as part of the 'site' build target.
You can create a database to erase information in an existing database and create a new database with the same name and physical structure.