How to fix Error 3739 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: Error 3739 in SQL Server 2025

Why This Error Happens

Error 3739 occurs when a Transact-SQL statement attempts to perform a statistics-only operation (such as UPDATE STATISTICS or DROP STATISTICS) against an object that is actually a regular index rather than a standalone statistics collection. This typically happens due to a naming ambiguity or scripting error where an index name is passed into a command path expecting a statistics object name. It can also surface after an automated maintenance script or third-party tool incorrectly enumerates sys.stats alongside sys.indexes, blurring the distinction between the two object types.

Step-by-Step Resolution Guide

Step 1: Identify the Object Type Causing the Conflict

  • Run the following query to determine if the name in the error message belongs to an index or a statistics object:
SELECT name, object_id, type_desc 
FROM sys.indexes 
WHERE name = 'YourObjectName';

SELECT name, object_id, stats_id 
FROM sys.stats 
WHERE name = 'YourObjectName';
  • Confirm whether the object has an index_id greater than 0 (indicating a true index) versus an entry only in sys.stats with no corresponding index.

Step 2: Correct the Maintenance Script or Query

  • Locate the maintenance plan, Agent Job step, or PowerShell/DBATools script issuing the failing command.
  • Replace generic enumeration logic (e.g., looping through sys.stats without filtering) with a filter that excludes auto-created index statistics:
SELECT s.name 
FROM sys.stats s
WHERE s.auto_created = 0 
AND s.user_created = 1;
  • Update any sp_updatestats or custom UPDATE STATISTICS calls to target the index directly using ALTER INDEX ... REBUILD or UPDATE STATISTICS <table> <index_name> syntax instead of a bare statistics name.

Step 3: Validate Index and Statistics Integrity

  • Open SQL Server Management Studio (SSMS) on Windows Server 2025 or Windows 11 and connect to the instance.
  • Navigate to Databases > [YourDB] > Tables > [YourTable] > Indexes and confirm the object in question is listed as an index, not under Statistics.
  • If corruption or metadata mismatch is suspected, run:
DBCC CHECKDB ('YourDatabaseName') WITH NO_INFOMSGS, ALL_ERRORMSGS;
  • Review the output for any metadata inconsistencies tied to sys.indexes or sys.stats and repair using DBCC CHECKDB with the appropriate repair option if corruption is confirmed.

Step 4: Re-run the Original Operation

  • Re-execute the original DROP STATISTICS, UPDATE STATISTICS, or maintenance job using the corrected object reference.
  • Monitor the SQL Server Error Log (via SSMS Object Explorer > Management > SQL Server Logs) to confirm Error 3739 no longer appears.

Alternative or Verification Steps

  • Verify the fix by querying sys.stats and sys.indexes again post-fix to ensure the script now correctly differentiates object types before executing statistics commands.
  • As an alternative, if the issue stems from a third-party backup or indexing tool, check for a vendor patch compatible with SQL Server 2025, since many legacy tools have not yet updated their internal catalog queries for the new engine version.