High-Availability Data Replication (HDR) requires two instances of the database server, a primary instance and a secondary instance, running on two computers. If you implement HDR for your database server, the database server holds logical-log records in the HDR buffers before it sends them to the secondary database server. An HDR buffer is always the same size as the logical-log buffer. For information on the size of the logical-log buffer, refer to the preceding section, Logical-Log Buffer. For more information on how the HDR buffer is used, refer to How HDR Works.
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