Which statement describes the external database requirement for the Cisco IM and Presence
permanent group chat feature?
A.
All nodes in a Cisco IM and Presence cluster can share a physical external database.
B.
All nodes in a Cisco IM and Presence cluster can share a logical external database.
C.
Each node in a Cisco IM and Presence cluster must have its own physical external database.
D.
Each node in a Cisco IM and Presence cluster must have its own logical external database.
E.
An external database is not mandatory.
Explanation:
When you configure an external database entry on IM and Presence, you assign the external
database to a node, or nodes, in your cluster as follows:
For the Compliance feature, you require at least one external database per cluster. Depending on
your deployment requirements, you can also configure a separate external database per node.
For the Permanent Group Chat feature, you require a unique external database per node. Configure
and assign a unique external database for each node in your cluster.
If you deploy both the Permanent Group Chat and Compliance features on an IM and Presence
node, you can assign the same external database to both features.
Group Chat
When multiple people need to have a chat conversation simultaneously, a group chat can
be established. Group chat can be either an ad hoc chat (temporary group chat) initiated
by a user when required or a permanent group chat.
A temporary group chat doesn’t require any special configuration. A permanent chat
room, however, requires an external database such as PostgreSQL. PostgreSQL can be
used for compliance features as well, as covered in the next section. The major difference
is that for permanent group chat, each Cisco Unified CM IM and Presence server
in a cluster requires a unique logical database, whereas for compliance, only one external
database server is required (with support for more than one server).
Ad hoc chat rooms remain in existence only as long as one person is still connected to
the chat room. In contrast to ad hoc chat rooms, permanent chat rooms are group chat
sessions that remain in existence even when all users have left the room, enabling users to
return to persistent chat rooms over time to collaborate and participate in the discussion
of a topic in real time
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