The wait type HADR_LOGCAPTURE_SYNC is ranked #162 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.
What is HADR_LOGCAPTURE_SYNC?The HADR_LOGCAPTURE_SYNC wait type occurs when SQL Server is waiting for synchronization between the log capture process on the primary replica and the availability group’s secondary replicas. The log capture process is responsible for reading transaction logs on the primary replica and sending them to the secondary replicas to keep them synchronized. In simpler terms, this wait type means SQL Server is ensuring the transaction logs are captured and sent to all replicas as part of the Always On synchronization process. While some wait time is normal, prolonged waits can indicate issues with your setup or workload. Why Does HADR_LOGCAPTURE_SYNC Happen?Several factors can contribute to HADR_LOGCAPTURE_SYNC waits, including:
Understanding and addressing these factors can help minimize the impact of this wait type on your system’s performance. How to Monitor HADR_LOGCAPTURE_SYNC WaitsMonitoring HADR_LOGCAPTURE_SYNC waits can provide insights into how effectively your Always On Availability Group is synchronizing. The Database Health Monitor is an excellent tool for this purpose. Its Historic Waits Monitoring feature allows you to track this and other wait types over time, helping you identify patterns and correlate waits with specific system events or workloads. By using Database Health Monitor, you can determine if these waits are caused by high transaction volume, resource constraints, or network issues, and take action to resolve the underlying problems. What Can You Do About HADR_LOGCAPTURE_SYNC Waits?If you encounter frequent or prolonged HADR_LOGCAPTURE_SYNC waits, consider the following actions:
These steps can help you reduce synchronization delays and improve the overall performance of your Always On environment. How Stedman Solutions Can HelpAt Stedman Solutions, we specialize in SQL Server performance tuning and troubleshooting, including resolving wait types like HADR_LOGCAPTURE_SYNC. Our managed services offer proactive monitoring and expert guidance to ensure your Always On Availability Groups are running smoothly. Additionally, our Database Health Monitor provides powerful tools for tracking and analyzing SQL Server waits, helping you maintain a high-performing and reliable database system. If you’re experiencing performance challenges or need assistance optimizing your SQL Server setup, contact us today. Let us help you achieve a resilient and efficient SQL Server environment!
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_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 |