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Practical Theory: Understanding Polling, Extraction and Backup
7-3
The following table summarizes polling, extraction and backup for Central, Local, and
Service computer types.
Computer
Type
1
and
Database
Connected
Via
Backup
Auto Polling
Auto Extraction
2
Central
Access
Modem
Midnight
(12:00AM)
Midnight
(12:00AM)
Copies the status; copies then deletes data.
Concurrent with autopoll.
Central
Access
RS-232
Midnight
(12:00AM)
Continuous
Copies the status; copies then deletes data.
Concurrent with first autopoll after 12AM.
Central
Access
LAN
Midnight
(12:00AM)
Continuous
Copies the status; copies then deletes data.
Concurrent with first autopoll after 12AM.
Local
Access
Modem
Midnight
(12:00AM)
10:00PM
Copies the status; copies data. Concurrent
with autopoll.
Local
Access
RS-232
Midnight
(12:00AM)
Continuous
Copies the status; copies data. Concurrent
with first autopoll after 10PM.
Local
Access
LAN
Midnight
(12:00AM)
Continuous
Copies the status; copies data. Concurrent
with first autopoll after 10PM.
Service
Access
(See Note 1)
Modem
Midnight
(12:00AM)
Autopolling
not available
(Manual only)
Auto extraction not available.
(Manual only)
Service
Access
(See Note 1)
RS-232
Midnight
(12:00AM)
Continuous
Auto extraction not available.
(Manual only)
Service
Access
(See Note 1)
LAN
Midnight
(12:00AM)
Continuous
Auto extraction not available.
(Manual only)
Note 1: End-user use of a computer set as Service type is not recommended.
Note 2: Status and data copy and delete functions are the same for manual extraction.
Figure 20. Computer Types: Backup, Polling and Extraction Table
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