Micromod Micro-PWC: 53PW6000 MicroPWC Operators Manual - Manual (Page 133)

Micro-PWC OPERATOR’S MANUAL
Utilities 119
Clicking on one of these menu options (Historical, Historical Block, Archival, Archival Block) opens a Data-
base Maintenance window containing read-only information about disk usage for the appropriate data-
base. This information is used by the system configurer to assess memory use. See the Micro-PWC
Configuration Guide for information on the Historical and Historical Block database maintenance windows.
11.3.2.1 Archival Database Maintenance
The Archival Database is the storage location for Historical Database information restored to the system
from archival tapes. The Archival Database Maintenance utility is used to display information about Archi-
val Database disk usage, and to delete information from the Archival Database.
It is recommended that the Archival Database be assessed periodically to determine whether information
in the Archival Database is still needed. If it is not needed, delete it. This will avoid wasting disk space. As
the Archival Database expands, additional disk space will be allocated for the database. However, once
allocated, space is never removed from the Archival Database allocation unless the Clear Database but-
ton is used (see
Section 11.3.2.1.2, Deleting Archival Data ).
To use the utility, select Menu > Utilities > Database Maintenance > Archival. The Archival Database Main-
tenance window shown in
Figure 11-15 will be displayed.
The list box at the top of the window includes the following information:
✎ NOTE
The Historical Block Database provides for the efficient collection of
data from a large number of tag.atoms; see the Micro-PWC
Configuration Guide for a detailed discussion of Historical Block
Data Collection. Like Historical Data, Historical Block Data can be
archived to tape. When data is restored from such a tape, it
becomes part of the Archival Block Database.
✎ NOTE
This is the only way that information is ever removed from the
Archival Database.
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Figure 11-15. Archival Database Maintenance Window