Cisco Cisco IP Contact Center Release 4.6.1 Guida Utente

up a large amount of data. While the HDS database is being backed up, new data from the
Logger is stored in the transaction log. If the transaction log reaches it maximum capacity
before the HDS has completed the backup, updates to the database stop until an administrator
manually empties the log.

Instead, back up at a regularly scheduled time when the contact center is not busy. You can
also take the HDS offline and perform a backup. However, the HDS is not available for
reporting when offline. If you plan to back up the HDS database while offline, you might
want to configure a secondary HDS to use for reporting during the backup interval.

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Determine the HDS backup schedule and the number of days for which data is retained on
the Logger.

You configure the number of days for which data is stored in the Logger central database
and the HDS. The Logger stores data for less time than the HDS. For example, you might
store two weeks of data on the Logger and a year of data on the HDS. You configure the
amount of time that data is stored on the Logger in relation to the schedule for HDS backups
to ensure that you do not lose data in the event that the HDS goes offline. When the HDS
recovers after going offline, it retrieves all data from the Logger for the interval for which
data is missing from the backup.

For example, if the HDS backup has data up to the last two weeks, the HDS would replicate
the last two weeks of data from the Logger when recovering from a failure. The amount of
data retained on the Logger cover, at a minimum, the time period between HDS backups.
For example, if the Logger stores data for two weeks, then you need to back up at least every
other week to ensure that you can recover all historical data after a HDS failure.

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Decide how many Historical Data Servers you require. For System IPCC deployments, the
required number of HDSs are installed automatically for your selected deployment.

The number of Historical Data Servers that you configure depends on how long the HDS
will take to backup and your reporting needs. If you are storing large amounts of data, backup
might take several hours. The HDS not be used to run historical reports while it is backing
up as this might decrease performance. If you want to run reports while the HDS is backing
up, you configure at least one additional HDS to use to run WebView reports.

See the Cisco ICM/IPCC Enterprise & Hosted Editions Release 7.1(1) Hardware and System
Software Specifications (Bill of Materials)  for guidelines on Reporting Users per HDS and
HDS capacity.

Reporting Guide for Cisco IPCC Enterprise & Hosted Editions 7.2(1)