vRealize Operations for Horizon requires that you have an event database to store information about Horizon events. You can store events in a SQL database or an Oracle database.
For supported database versions, see "Database Requirements for View Composer and the Events Database" in the Horizon Installation document for your version.
If you use an Oracle event database, a recent version of Oracle Data Access Components (ODAC) and Oracle Instant Client (Basic or Basic Light package) must be installed on your system.
For more information, see Oracle Event Databases.