SQL Server Error 8651, Severity 17 'Could not perform the operation because the requested memory grant was not available in resource pool '%ls' (%ld). Rerun the query, reduce memory requirements, or increase the size of the resource pool.' SQL Server Error 8651 is a system-level error typically encountered when a query attempts to request more memory than is available or allocable from its current workload group's assigned resource pool. This could be due to insufficient system resources (e.g., low physical server memory) or overly large queries that demand significant grants for sorting, hashing operations, or complete table scans.
Severity Level 17 indicates a configuration issue on the database level rather than internal corruption. It suggests that troubleshooting action is needed by either revising settings related to workloads and memory quotas or adjusting how queries are executed.
The primary reason behind this error revolves around Resource Governor limits if enabled (`%ls` represents resource pool names such as "default" pool).
Resolution: To resolve SQL Server Error 8651 effectively:
- Analyze Current Memory Allocation and Utilization.
- Understand Total System-Level Memory Allocation, run these T-SQL statements to determine how much memory is allocated at various levels. Check the total committed and used max-process memory in MB.
SELECT
physical_memory_in_use_kb / 1024 AS PhysicalMemoryUsed_MB, locked_page_allocations_kb / 1024 AS LockedPages_MB, total_virtual_address_space_kb / 1024 AS VirtualAddressSpace_MB, process_physical_memory_low
FROM sys.dm_os_process_memory;
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