How to fix Error 5325 on Windows Server 2025 / Windows 11

by

Troubleshooting Guide: Error 5325 – ORDER Hint Mismatch in BULK Rowset

Why This Error Happens

This error occurs when the SQL Server query optimizer detects that the actual physical order of rows in the source data file does not match the column order specified in the ORDER hint of a BULK INSERT, OPENROWSET(BULK...), or BCP-related operation. SQL Server relies on this hint to optimize sort-dependent operations (like merge joins or indexed inserts) without performing an actual sort, so any deviation—even a single out-of-sequence row—triggers a hard validation failure. This commonly happens after a data file has been modified, re-exported from a different source, or if the ORDER hint was copied from a template without verifying the actual file contents.

Step-by-Step Resolution Guide

Step 1: Verify the Actual Data Order in the Source File

  • Open the source .csv, .dat, or .txt file using a text editor or import it into a staging table without the ORDER hint.
  • Run a SELECT query against the staging table with an ORDER BY on the suspected key column(s) and compare row-by-row against the raw file.
  • Identify the exact column(s) and direction (ASC/DESC) that the data is actually sorted by.

Step 2: Correct the ORDER Hint in Your T-SQL Statement

  • Locate the BULK INSERT or OPENROWSET(BULK...) statement in your script.
  • Update the ORDER clause to exactly match the verified column order from Step 1, for example:
  • WITH (ORDER (CustomerID ASC, OrderDate ASC))
  • Ensure column names in the hint match the destination table schema exactly, including case sensitivity if using a case-sensitive collation.

Step 3: Re-Sort the Source File if the Hint Cannot Be Changed

  • If the ORDER hint is fixed by downstream dependencies (e.g., a merge join plan), re-sort the source file instead.
  • Use PowerShell on Windows Server 2025 to pre-sort the file:
  • Import-Csv .\sourcefile.csv | Sort-Object CustomerID, OrderDate | Export-Csv .\sourcefile_sorted.csv -NoTypeInformation
  • Re-point the BULK INSERT statement to the newly sorted file path.

Step 4: Check for Hidden Data Issues Causing False Mismatches

  • Inspect the file for blank lines, trailing whitespace, or inconsistent line terminators (\r\n vs \n), which can cause SQL Server to misread row boundaries and falsely report order violations.
  • Use ROWTERMINATOR and FIELDTERMINATOR arguments explicitly in your BULK INSERT statement to rule out parsing ambiguity.

Alternative or Verification Steps

  • To verify the fix, re-run the BULK INSERT statement and confirm Error 5325 no longer appears; check sys.dm_exec_query_stats or the SQL Server error log to confirm successful completion.
  • As an alternative, remove the ORDER hint entirely (if performance impact is acceptable) and let SQL Server perform an implicit sort—this avoids the validation check at the cost of additional CPU/I/O overhead.