How to fix Error 13133 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 13133 – High Cumulative Wait Time (ms) per Second

Why This Error Happens

Error 13133 surfaces when SQL Server 2025’s resource monitoring subsystem detects that cumulative wait time per second has crossed an internal threshold, indicating queries are spending excessive time waiting on resources rather than executing. This is typically caused by contention on locks, latches, or I/O subsystems, often exacerbated by outdated statistics, missing indexes, or insufficient tempdb configuration. On Windows Server 2025 / Windows 11, this can also be triggered by storage driver bottlenecks or misconfigured memory limits that force excessive paging and disk waits.

Step-by-Step Resolution Guide

Step 1: Identify the Dominant Wait Type

  • Run the following query to isolate top wait categories:
  • SELECT wait_type, wait_time_ms, waiting_tasks_count FROM sys.dm_os_wait_stats ORDER BY wait_time_ms DESC;
  • Look specifically for PAGEIOLATCH, WRITELOG, LCK_M_*, or CXPACKET entries, as these point to I/O, transaction log, locking, or parallelism issues respectively.
  • Cross-reference with Event Viewer under Windows Logs > Application for correlating Event ID 13133 timestamps.

Step 2: Optimize tempdb and Storage Configuration

  • Ensure tempdb has multiple data files (ideally one per 4 logical CPU cores, up to 8) to reduce PAGELATCH contention.
  • Navigate to SQL Server Configuration Manager > SQL Server Services, verify the service account has “Perform Volume Maintenance Tasks” rights via secpol.msc for instant file initialization.
  • Relocate tempdb files to a dedicated high-speed SSD/NVMe volume separate from user databases using ALTER DATABASE tempdb MODIFY FILE.

Step 3: Update Statistics and Rebuild Indexes

  • Execute EXEC sp_updatestats; on the affected database to refresh the query optimizer’s data distribution knowledge.
  • Run ALTER INDEX ALL ON [TableName] REBUILD WITH (ONLINE = ON); on heavily fragmented tables (check fragmentation via sys.dm_db_index_physical_stats).
  • Schedule these as a recurring SQL Server Agent job during low-traffic maintenance windows.

Step 4: Adjust Memory and MAXDOP Settings

  • Open SQL Server Management Studio (SSMS) > Server Properties > Memory, and set “Maximum server memory” to leave at least 4GB free for the Windows Server 2025 OS.
  • Configure “Max Degree of Parallelism” (MAXDOP) appropriately—typically set to the number of cores per NUMA node (max 8) via sp_configure 'max degree of parallelism', 4; RECONFIGURE;.
  • Restart the SQL Server service through Services.msc or net stop MSSQLSERVER && net start MSSQLSERVER to apply changes.

Alternative or Verification Steps

  • Re-run the sys.dm_os_wait_stats query after 24 hours of normal workload; cumulative wait time per second should show a measurable decline, and Event ID 13133 should no longer appear in the Application log.
  • If waits persist, use Performance Monitor (PerfMon) on Windows Server 2025 to track the Avg. Disk sec/Transfer counter—if above 20ms, the bottleneck is hardware-level storage latency requiring a disk subsystem upgrade rather than a SQL-side fix.