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Each time a row in a table is inserted, deleted, or updated, a message is created for those users subscribed to the row. In addition, an update may cause the subscription expression to change, so that the statement is sent to some subscribers as a delete, some as an update, and some as an insert.
The task of determining who gets what is divided between the database server and the SQL Remote Message Agent (dbremote).
Tasks to receive messages
Performance when receiving messages
Tasks to send messages
Performance when sending messages
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