AVG 9.0 EMAIL SERVER EDITION - REVISED 10-2009 User Manual page 31

application interface. It provides threaded scanning of the Exchange Messaging
Databases. Whenever an item that has not been scanned with the latest AVG
virus base update is encountered in the users' mailbox folders, it is submitted to
AVG for Exchange 2007 Server to be scanned. Scanning and searching for the
not examined objects runs in parallel.
A specific low priority thread is used for each database, which guarantees other
tasks (e.g. e-mail messages storage in the Microsoft Exchange database) are
always carried out preferentially.
Proactive Scan (incoming messages)
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You can enable or disable the proactive scanning function of VSAPI 2.0/2.5 here.
This scanning occurs when an item is delivered to a folder, but a request has not
been made by a client.
As soon as messages are submitted to the Exchange store, they enter the global
scanning queue as low priority (maximum of 30 items). They are scanned on the
first in, first out (FIFO) basis. If an item is accessed while still in the queue, it is
changed to high priority.
Note: Overflow messages will continue to the store unscanned.
Note: Even if you disable both Background Scan and Proactive Scan options, the on
access scanner will be still active when an user will try to download a message with
the MS Outlook client.
Scan RTF - you can specify here, whether the RTF file type should be scanned
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or not.
Number of Scanning Threads - the scanning process is threaded by default to
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increase the overall scanning performance by a certain level of parallelism. You
can change the threads count here.
The default number of threads is computed as 2 times the
'number_of_processors' + 1.
The minimum number of threads is computed as ('number of processors'+1)
divided by 2.
The maximum number of threads is computed as 'Number of Processors' multiplied
by 5 + 1.
If the value is the minimum or lesser value or the maximum or greater, the
default value is used.
Scan Timeout - the maximum continuous interval (in seconds) for one thread to
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AVG 9.0 Email Server Edition © 2009 C opyright AVG Technologies C Z, s.r.o. All rights reserved. 31