Maintenance Manual

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Cisco ICM Enterprise Edition Administrator Guide Release 6.0(0)
Chapter 3 The ICM Databases
Locks
One Distributor AW at each admin site is an HDS machine. The Central
Controller forwards historical records to the HDS machine for storage in a special
local database. Other Admin Workstations at the local site can retrieve historical
data from the HDS machine without having to access the central site (see
Figure 3-3).
Figure 3-3 Historical Data Server Architecture
To set up an Historical Data Server, you must configure the Logger to perform
historical data replication. You must also configure a Distributor Admin
Workstation to be an Historical Data Server. You can use the ICM Setup tool to
create an HDS database on a real-time distributor.
For specific information about setting up an HDS database, see Chapter 4,
“Database Administration.”
Locks
To prevent users from changing the same data simultaneously, ICM configuration
data records contain a ChangeStamp field. The ChangeStamp field is incremented
when the record is changed in the central database. When an administrator makes
changes to configuration data and sends the changed data to the Logger, the value
of the ChangeStamp field is compared to the value in the Logger’s copy. If the
AW 5AW 4AW 3
AW 2
Historical
Data Server
Distributor
AW 1
Central Controller
Admin Site
Logger with Historical
Data Replication enabled
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