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Server Snapshot Logs

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‎2021-06-09 09:44 AM

Server Snapshot Logs

Originally published on Geo SCADA Knowledge Base by Anonymous user | June 09, 2021 06:44 PM

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ClearSCADA 2007 introduced support for taking regular 'snapshots' of the ClearSCADA server. The snapshot contains information normally available in the server status dialog, e.g. memory, CPU, internal threads etc., and logs it to a file.

Snapshots can be particularly useful in circumstances where server problems are thought to be the result of memory issues. In this case, exceptions may not be captured properly due to the lack of memory, and so the snapshot file may give an indication that memory issues are the problem. The series of snapshots before the crash can be used to determine the change in memory usage of the server over time.

By default, snapshots are enabled on a server and log at a frequency of every 30 minutes. The settings for the snapshots are controlled in the registry. The settings are:

 Registry Section Key Name Comments
 DB SnapshotEnable True (default) or False. This should always be set to True, unless the automatic snapshot facility is to be disabled.
 DB SnapshotInterval The interval between snapshots in minutes. This is synchronised to the hour boundary (Default: 30 minutes)
 DB_Snapshot LogEnable True (Default) or False. This should always be set to True.
 DB_Snapshot LogFileBase The location of the snapshot log files. This defaults to the standard Log files directory for ClearSCADA.
 DB_Snapshot LogLevel This defaults to 1.
 DB_Snapshot LogLinesPerFlush This defaults to 1.
 DB_Snapshot LogMaxFiles The number of snapshot log files to keep for each server session (Default: 2)
 DB_Snapshot LogMaxSize The maximum size of each snapshot log file in bytes (Default: 2048).
 DB_Snapshot LogOldFiles The number of previous server session log file sets to keep (Default: 1)


The Server Status dialog now also allows for a manual snapshot of each page of information displayed. This can be accessed by selecting 'Save Snapshot...' from the File menu. Only the currently displayed page of information will be logged to the snapshot file.

Each snapshot log file will contain more than one snapshot.


Changing a snapshot interval in the registry does not change it immediately. In versions prior to ClearSCADA 2009 R1, a server restart was required. In 2009 R1, the new timing will be used AFTER the next snapshot is completed.


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