The wait type HADR_TRANSPORT_DBRLIST is ranked #297 by Stedman Solutions and Database Health Monitor. Wait statistics, in the context of SQL Server, refer to the amount of time that a query spends waiting to access data in the database. When a client application requests data from the database, the request is placed in a queue and the client application must wait for its turn to access the data. The time that the query spends waiting is called a "wait" and is tracked by SQL Server. This information can be used to identify potential performance bottlenecks and optimize the performance of the database. Wait statistics are commonly used by database administrators to diagnose and troubleshoot performance issues in SQL Server.
SQL Server Always On Availability Groups are designed to keep replicas synchronized for high availability and disaster recovery. During the synchronization process, certain wait types can occur, such as HADR_TRANSPORT_DBRLIST. Understanding this wait type can help you optimize your Always On environment and resolve potential bottlenecks in the synchronization process. What is HADR_TRANSPORT_DBRLIST?The HADR_TRANSPORT_DBRLIST wait type occurs when SQL Server is working on tasks related to transporting and managing the database replica list (DBR List) in an Always On Availability Group. This list contains details about the replicas, their roles, and their statuses. The wait indicates that SQL Server is waiting for a process related to maintaining or accessing this list to complete. In simpler terms, this wait type means SQL Server is ensuring that replica information is properly synchronized and managed, which is essential for smooth operations in Always On Availability Groups. Why Does HADR_TRANSPORT_DBRLIST Happen?Several factors can lead to HADR_TRANSPORT_DBRLIST waits, including:
Identifying and addressing these factors can help reduce the impact of this wait type and improve system performance. How to Monitor HADR_TRANSPORT_DBRLIST WaitsMonitoring HADR_TRANSPORT_DBRLIST waits is crucial for diagnosing synchronization issues in Always On Availability Groups. The Database Health Monitor is an excellent tool for tracking this wait type. Its Historic Waits Monitoring feature allows you to observe when these waits occur, how frequently they happen, and their correlation with other system events. Using Database Health Monitor, you can identify patterns in these waits and pinpoint whether they are caused by network, resource, or configuration issues. This insight enables you to take targeted actions to optimize your Always On environment. What Can You Do About HADR_TRANSPORT_DBRLIST Waits?If you notice frequent or prolonged HADR_TRANSPORT_DBRLIST waits, consider the following actions:
These steps can help improve synchronization efficiency and reduce the occurrence of this wait type, ensuring a smoother Always On experience. Why Use Database Health Monitor?The Database Health Monitor is a powerful tool for tracking and analyzing SQL Server wait types, including HADR_TRANSPORT_DBRLIST. Its Historic Waits Monitoring feature provides detailed insights into your system’s performance, helping you identify and resolve bottlenecks in Always On synchronization processes. With Database Health Monitor, you can ensure that your SQL Server environment operates at its best. Start using Database Health Monitor today to monitor and optimize your SQL Server’s performance, keeping your Always On Availability Groups running smoothly!
Applies toRelated WaitsHADR_AG_MUTEXHADR_AR_CRITICAL_SECTION_ENTRY HADR_AR_MANAGER_MUTEX HADR_AR_UNLOAD_COMPLETED HADR_ARCONTROLLER_NOTIFICATIONS_SUBSCRIBER_LIST HADR_BACKUP_BULK_LOCK HADR_BACKUP_QUEUE HADR_CLUSAPI_CALL HADR_COMPRESSED_CACHE_SYNC HADR_CONNECTIVITY_INFO HADR_DATABASE_FLOW_CONTROL HADR_DATABASE_VERSIONING_STATE HADR_DATABASE_WAIT_FOR_RESTART HADR_DATABASE_WAIT_FOR_TRANSITION_TO_VERSIONING HADR_DB_COMMAND HADR_DB_OP_COMPLETION_SYNC HADR_DB_OP_START_SYNC HADR_DBR_SUBSCRIBER HADR_DBR_SUBSCRIBER_FILTER_LIST HADR_DBSEEDING HADR_DBSEEDING_LIST HADR_DBSTATECHANGE_SYNC HADR_FABRIC_CALLBACK HADR_FILESTREAM_BLOCK_FLUSH HADR_FILESTREAM_FILE_CLOSE HADR_FILESTREAM_FILE_REQUEST HADR_FILESTREAM_IOMGR HADR_FILESTREAM_MANAGER HADR_GROUP_COMMIT HADR_LOGCAPTURE_SYNC HADR_LOGCAPTURE_WAIT HADR_LOGPROGRESS_SYNC HADR_NOTIFICATION_DEQUEUE HADR_NOTIFICATION_WORKER_EXCLUSIVE_ACCESS HADR_NOTIFICATION_WORKER_STARTUP_SYNC HADR_NOTIFICATION_WORKER_TERMINATION_SYNC HADR_PARTNER_SYNC HADR_READ_ALL_NETWORKS HADR_RECOVERY_WAIT_FOR_CONNECTION HADR_RECOVERY_WAIT_FOR_UNDO HADR_REPLICAINFO_SYNC HADR_SYNC_COMMIT HADR_SYNCHRONIZING_THROTTLE HADR_TDS_LISTENER_SYNC HADR_TDS_LISTENER_SYNC_PROCESSING HADR_TIMER_TASK HADR_TRANSPORT_FLOW_CONTROL HADR_TRANSPORT_SESSION HADR_WORK_POOL HADR_WORK_QUEUE HADR_XRF_STACK_ACCESS See AlsoAll Wait Types |