Micromod Micro-PWC: 53PW6000 MicroPWC Configuration Guide - Manual (Page 290)

Micro-PWC CONFIGURATION GUIDE
270 Utilities
9.2.2 Locating Specific Historical Tags
If more Historical Database points have been configured than can appear in the Historical Tag list box, the
Prev and Next buttons become available. Click Next to display the historical tags which follow those cur-
rently on display in the list box. Click Prev to display the historical tags which precede those currently on
display in the list box.
The Find button, located at the bottom of the Historical Database Maintenance window is used to deter-
mine the presence of a given point in the Historical Database. If the point does exist, Find quickly locates it
in the Historical Tag list box and highlights it.
To use this feature, click Find. In the resulting pop-up window, click the entry box and enter the desired
Historical Tagname. If only a portion of the tagname is entered, the first entry where the first letters of the
tagname match the entered string will be chosen. For example, if the string HR is entered, and the first tag-
name to begin with these characters is HRANO1, then this is the tagname that would be highlighted in the
Historical Tag list box.
Click Apply to locate the first instance of the string; the Find window will remain open; click Apply again to
locate the next instance of the string, or enter a new string to be located. Click OK to perform the Find
operation and close the Find window.
9.2.3 Historical Block Database Maintenance
The Historical Block Database provides for efficient collection of data from a large number of controller
tag.atoms. Historical Block Data collection is discussed in
Section 10.0, Historical Block Data Collection .
The Historical Block Database Maintenance window is used to display read-only information about Histor-
ical Block Database disk usage. This information can be of value when assessing whether the block collec-
tion configuration is causing the block to use an undesirable amount of disk space.
To access Historical Block Database Maintenance, select Menu > Utilities > Database Maintenance > His-
torical Block. The features in the resulting window are used as described in
Section 9.2.1, Historical Data-
base Maintenance .
9.2.4 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 not, 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 theArchival Database allocation unless the Clear Database button
is used as described below.
✎ Note
This is the only way that information is ever removed from the
archival database.