Required Databases

The following components all require databases: Cloudera Manager Server, Oozie Server, Sqoop Server, Reports Manager, Hive Metastore Server, Hue Server, DAS server, and Ranger.

The type of data contained in the databases and their relative sizes are as follows:

Cloudera Manager Server - Contains all the information about services you have configured and their role assignments, all configuration history, commands, users, and running processes. This relatively small database (< 100 MB) is the most important to back up.
important
When you restart processes, the configuration for each of the services is redeployed using information saved in the Cloudera Manager database. If this information is not available, your cluster cannot start or function correctly. You must schedule and maintain regular backups of the Cloudera Manager database to recover the cluster in the event of the loss of this database.
Oozie Server - Contains Oozie workflow, coordinator, and bundle data. Can grow very large. (Only available when installing CDH 5 or CDH 6 clusters.)
Sqoop Server - Contains entities such as the connector, driver, links and jobs. Relatively small. (Only available when installing CDH 5 or CDH 6 clusters.)
Reports Manager - Tracks disk utilization and processing activities over time. Medium-sized.
Hive Metastore Server - Contains Hive metadata. Relatively small.
Hue Server - Contains user account information, job submissions, and Hive queries. Relatively small.
Sentry Server - Contains authorization metadata. Relatively small.
Cloudera Navigator Audit Server - Contains auditing information. In large clusters, this database can grow large.(Only available when installing CDH 5 or CDH 6 clusters.)
Cloudera Navigator Metadata Server - Contains authorization, policies, and audit report metadata. Relatively small.(Only available when installing CDH 5 or CDH 6 clusters.)
DAS PostgreSQL server - Contains Hive and Tez event logs and DAG information. Can grow very large.
Ranger Admin - Contains administrative information such as Ranger users, groups, and access policies. Medium-sized.
Streaming Components:
- Schema Registry - Contains the schemas and their metadata, all the versions and branches. You can use either MySQL, Postgres, or Oracle.
  important
  For the Schema Registry database, you must set collation to be case sensitive.
- Streams Messaging Manager Server - Contains Kafka metadata, stores metrics, and alert definitions. Relatively small.

The Host Monitor and Service Monitor services use local disk-based datastores.

The JDBC connector for your database must be installed on the hosts where you assign the Activity Monitor and Reports Manager roles.

For instructions on installing and configuring databases for Cloudera Manager, Runtime, and other managed services, see the instructions for the type of database you want to use.