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SQL Anywhere 10.0.1 » SQL Remote » SQL Remote Administration » Tuning Message Agent performance » Tuning the message sending process

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Resending messages

When a user requests that a message be resent, the message has to be retrieved from early in the transaction log. Going back in the transaction log to retrieve this message and send it causes the Message Agent to interrupt the regular sending process. If you are tuning your SQL Remote installation for optimum performance, you must balance the urgency of sending requests for resent messages with the priority of processing regular messages.

The -ru option controls the urgency of the resend requests. The value for the parameter is a time in minutes (or in other units if you add s or h to the end of the number), with a default of zero.

To help the Message Agent delay processing resend requests until more have arrived before interrupting the regular message sending activity, set this option to a longer time.

The following command line waits one hour until processing a resend request.

dbremote -ru 1h ...

If you do not specify the -ru option, then a default value is picked by the Message Agent, based on the send interval of the users that have requested that data be resent. The elapsed time between receiving a resend request for a user and rescanning the log does not exceed half of the send interval for that user.