-| 2 | Capture | Logs for each database is captured and sent to the corresponding partner queue (one per database-replica pair). This capture process runs continuously as long as the availability replica is connected and data movement isn't suspended for any reason, and the database-replica pair is shown to be either Synchronizing or Synchronized. If the capture process isn't able to scan and enqueue the messages fast enough, the log send queue builds up. | [SQL Server:Availability Replica > Bytes Sent to Replica/sec](../../../relational-databases/performance-monitor/sql-server-availability-replica.md), which is an aggregation of the sum of all database messages queued for that availability replica.<br /><br />[log_send_queue_size](../../../relational-databases/system-dynamic-management-views/sys-dm-hadr-database-replica-states-transact-sql.md) (KB) and [log_bytes_send_rate](../../../relational-databases/system-dynamic-management-views/sys-dm-hadr-database-replica-states-transact-sql.md) (KB/sec) on the primary replica. |
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