| The wait type LCK_M_RS_S is ranked #152 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. The LCK_M_RS_S wait type in SQL Server is a type of wait that occurs when a task is waiting for a shared (S) lock to be released on a resource. This type of wait typically occurs when multiple tasks are trying to access the same resource, such as a table or a row of data. In order to prevent conflicts and ensure data integrity, SQL Server uses locks to control access to resources. When a task attempts to access a resource that is already being used by another task, it must wait for the lock to be released before it can proceed. The LCK_M_RS_S wait type indicates that a task is waiting for a shared lock to be released in order to read or modify data in a resource. This wait type can occur in different levels of granularity, depending on the type of lock that is being held. For example, a LCK_M_RS_S wait can occur at the page level, when a task is waiting for a shared lock on a page of data in a table, or at the row level, when a task is waiting for a shared lock on a specific row of data. In general, the LCK_M_RS_S wait type indicates that there is contention for resources in the database, which can lead to performance degradation. To address this issue, a database administrator can monitor the occurrence of this wait type and use tools such as the SQL Server Profiler to identify which tasks and resources are causing the contention. The administrator can then use this information to optimize the database design and queries to reduce the amount of lock contention. In summary, the LCK_M_RS_S wait type in SQL Server indicates that a task is waiting for a shared lock to be released in order to read or modify data in a resource. This wait type can occur at different levels of granularity and can lead to performance issues if not addressed. A database administrator can monitor and optimize the database to reduce the occurrence of this wait type. Applies toRelated WaitsLCK_M_BULCK_M_BU_ABORT_BLOCKERS LCK_M_BU_LOW_PRIORITY LCK_M_IS LCK_M_IS_ABORT_BLOCKERS LCK_M_IS_LOW_PRIORITY LCK_M_IU LCK_M_IU_ABORT_BLOCKERS LCK_M_IU_LOW_PRIORITY LCK_M_IX LCK_M_IX_ABORT_BLOCKERS LCK_M_IX_LOW_PRIORITY LCK_M_RIn_NL LCK_M_RIn_NL_ABORT_BLOCKERS LCK_M_RIn_NL_LOW_PRIORITY LCK_M_RIn_S LCK_M_RIn_S_ABORT_BLOCKERS LCK_M_RIn_S_LOW_PRIORITY LCK_M_RIn_U LCK_M_RIn_U_ABORT_BLOCKERS LCK_M_RIn_U_LOW_PRIORITY LCK_M_RIn_X LCK_M_RIn_X_ABORT_BLOCKERS LCK_M_RIn_X_LOW_PRIORITY LCK_M_RS_S_ABORT_BLOCKERS LCK_M_RS_S_LOW_PRIORITY LCK_M_RS_U LCK_M_RS_U_ABORT_BLOCKERS LCK_M_RS_U_LOW_PRIORITY LCK_M_RX_S LCK_M_RX_S_ABORT_BLOCKERS LCK_M_RX_S_LOW_PRIORITY LCK_M_RX_U LCK_M_RX_U_ABORT_BLOCKERS LCK_M_RX_U_LOW_PRIORITY LCK_M_RX_X LCK_M_RX_X_ABORT_BLOCKERS LCK_M_RX_X_LOW_PRIORITY LCK_M_S LCK_M_S_ABORT_BLOCKERS LCK_M_S_LOW_PRIORITY LCK_M_SCH_M LCK_M_SCH_M_ABORT_BLOCKERS LCK_M_SCH_M_LOW_PRIORITY LCK_M_SCH_S LCK_M_SCH_S_ABORT_BLOCKERS LCK_M_SCH_S_LOW_PRIORITY LCK_M_SIU LCK_M_SIU_ABORT_BLOCKERS LCK_M_SIU_LOW_PRIORITY LCK_M_SIX LCK_M_SIX_ABORT_BLOCKERS LCK_M_SIX_LOW_PRIORITY LCK_M_U LCK_M_U_ABORT_BLOCKERS LCK_M_U_LOW_PRIORITY LCK_M_UIX LCK_M_UIX_ABORT_BLOCKERS LCK_M_UIX_LOW_PRIORITY LCK_M_X LCK_M_X_ABORT_BLOCKERS LCK_M_X_LOW_PRIORITY See AlsoAll Wait Types |  |