OpenEdge Getting Started: Installation and Configuration - Product ...

OpenEdge event logging
The PROLOG utility removes all but the most recent entries from the log file. For more
information, see the details about PROLOG in the “Truncate the database log file” section
on page 213 and also see OpenEdge Data Management: Database Administration.
Truncate the database log file
The purpose of this activity is to allow you to truncate a database log file that exists and
the size is greater than 3072 bytes.
Truncating a log file online
The online activity is intended to help you avoid bringing the database down and
restarting it after the database has been truncated. This eliminates the need to
shutdown the database to archive the log file. An online truncation log file records the
start and end of truncation activities and records errors to indicate when a truncation
failed, such as:
prolog database-name [-online]
prolog
Enables truncation of a log file. By default, a log file is truncated offline.
database-name
-online
The name of the database to be truncated.
Using the option -online, you do not have to shutdown and restart the database
to truncate the database log file.
The online truncation option copies the last 3072+ bytes to a buffer, truncates the
file, and then copies the buffer to the file.
Note: Keep in mind that if the -online option is used, the prolog command can
truncate a log file even if the database is in use.
For more information about the syntax associated with these online and offline
activities, see OpenEdge Data Management: Database Administration.
OpenEdge Getting Started: Installation and Configuration 213