How to fix Error 11729 on Windows Server 2025 / Windows 11

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Why This Error Happens

This error occurs when a SEQUENCE object is configured with a CACHE size that exceeds the total number of remaining values between its current position and the MAXVALUE (or MINVALUE if cycling downward). SQL Server pre-allocates and caches a block of sequence values in memory to improve performance, but if the defined cache size is larger than what the range restriction (START, MINVALUE, MAXVALUE, INCREMENT) can supply, the engine cannot fulfill the cache request. This is purely a configuration/design issue tied to how the sequence was created or altered, not a corruption or permissions problem.

Step-by-Step Resolution Guide

Step 1: Identify the Problematic Sequence Object

  • Run the following query to locate sequence objects and their current configuration:
  • SELECT name, cache_size, increment, minimum_value, maximum_value, current_value FROM sys.sequences;
  • Note the exact object name referenced in the Error 11729 message (the %.*ls placeholder will show the schema-qualified sequence name in the actual error output).

Step 2: Recalculate the Valid Range vs. Cache Size

  • Determine the total number of remaining values using: (maximum_value - current_value) / increment.
  • Compare this number against the cache_size value retrieved in Step 1.
  • If cache_size is larger than the remaining range, this confirms the root cause.

Step 3: Alter the Sequence to Reduce Cache Size

  • Open SQL Server Management Studio (SSMS) or a query window on SQL Server 2025.
  • Run an ALTER statement to reduce the cache size to a safe value, for example:
  • ALTER SEQUENCE dbo.YourSequenceName CACHE 50;
  • Alternatively, if the business logic requires a large cache, increase the MAXVALUE instead:
  • ALTER SEQUENCE dbo.YourSequenceName NO MAXVALUE; (or set an explicit higher value with MAXVALUE 999999999)

Step 4: Restart the Dependent Application or Service

  • On Windows Server 2025 / Windows 11, restart the SQL Server service via services.msc or run:
  • net stop MSSQLSERVER && net start MSSQLSERVER
  • This clears any stale cached sequence metadata held in memory by the Database Engine.

Step 5: Audit Other Sequences for the Same Misconfiguration

  • Run a broader audit query across all databases to prevent recurrence:
  • SELECT s.name, s.cache_size, s.maximum_value, s.current_value FROM sys.sequences s WHERE s.cache_size > ((s.maximum_value - s.current_value) / s.increment);
  • Correct any other sequence objects flagged by this query using the same ALTER SEQUENCE approach from Step 3.

Alternative or Verification Steps

  • Verify the fix by executing SELECT NEXT VALUE FOR dbo.YourSequenceName; multiple times in a loop (e.g., 20-30 iterations) and confirming no Error 11729 is raised in the Messages pane or Windows Event Viewer (Application log).
  • If the error persists under heavy concurrent load, consider using CACHE with a smaller explicit value (such as CACHE 10) or switch to NO CACHE entirely to force synchronous allocation, trading some performance for guaranteed consistency against the defined range.