The default key space name of the BAM server is EVENT_KS. By default, BAM persists data in EVENT_KS keyspace but you can define a different keyspace name for BAM persistence. It helps in physical separation of data, especially where the same cassandra cluster is used by multiple solutions/services.
To change this, edit the <keySpaceName> element in <BAM_HOME>/repository/conf/advanced/streamdefn.xml file.
For indexing purposes, another key-space is used by BAM. Default name for index key-space is EVENT_INDEX_KS.
To change this, edit the <eventIndexKeySpaceName> element in <BAM_HOME>/repository/conf/advanced/streamdefn.xml file.