| The wait type HADR_AR_CRITICAL_SECTION_ENTRY is ranked #166 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. In Microsoft SQL Server, a wait type is a type of event that occurs when a task has to wait for a resource or for an event to complete before it can continue processing. One of the wait types that can occur in SQL Server is HADR_AR_CRITICAL_SECTION_ENTRY. The HADR_AR_CRITICAL_SECTION_ENTRY wait type occurs when a task is waiting to acquire a lock on the Always On Availability Groups (AG) Auto-Restore (AR) critical section. The AG Auto-Restore feature is a component of the AG feature in SQL Server that allows you to restore a database to a previous state in case of data loss or corruption. The critical section is a mechanism that ensures that only one task can access the AG Auto-Restore feature at a time. The HADR_AR_CRITICAL_SECTION_ENTRY wait type can occur for various reasons, such as when there are multiple tasks trying to access the AG Auto-Restore feature simultaneously, or when there is an issue with the critical section itself. It can also occur if the database is heavily accessed and there are not enough resources available to complete the tasks in a timely manner. It is important to monitor for the HADR_AR_CRITICAL_SECTION_ENTRY wait type, as it can indicate that there may be issues with the performance of the database or with the AG Auto-Restore feature. If this wait type occurs frequently or for a long duration, it can potentially impact the performance and availability of the database. To resolve issues with the HADR_AR_CRITICAL_SECTION_ENTRY wait type, you may need to troubleshoot the cause of the issue and take appropriate action, such as optimizing the AG Auto-Restore configuration or increasing the available resources. It is also important to ensure that the AG Auto-Restore feature is properly configured and that all tasks being performed by the AG Auto-Restore are functioning correctly. By monitoring for and addressing issues with the HADR_AR_CRITICAL_SECTION_ENTRY wait type, you can ensure that your database is performing optimally and that your data is protected.
Applies toRelated WaitsHADR_AG_MUTEXHADR_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_DBRLIST HADR_TRANSPORT_FLOW_CONTROL HADR_TRANSPORT_SESSION HADR_WORK_POOL HADR_WORK_QUEUE HADR_XRF_STACK_ACCESS See AlsoAll Wait Types |  |
