How to fix Error 1532 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 1532 — Extent Not Marked as Shared During Sort Operation

Why This Error Happens

This error occurs when SQL Server’s sort operator encounters a page allocation inconsistency within tempdb or a user database during a parallel sort operation, typically caused by corrupted allocation page metadata (PFS, GAM, or SGAM pages). It frequently arises from underlying storage subsystem issues—such as disk controller errors, faulty SSD firmware, or improper write-caching configurations—that cause torn or incomplete writes to allocation structures. In rarer cases, this can also stem from a SQL Server engine defect triggered by specific parallel query plans interacting with mixed extent allocations.

Step-by-Step Resolution Guide

Step 1: Retry the Transaction and Capture Diagnostic Data

  • Re-run the failing query or transaction, since this error is sometimes transient and tied to momentary allocation contention.
  • If it persists, capture the full error text, including the %S_PGID value and the associated database ID.
  • Check the SQL Server Error Log (via SSMS or C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Log\ERRORLOG) for correlating I/O or corruption warnings.

Step 2: Run DBCC CHECKDB to Identify Corruption

  • Open a query window in SSMS and execute:
  DBCC CHECKDB ('YourDatabaseName') WITH NO_INFOMSGS, ALL_ERRORMSGS;
  • If the error references tempdb specifically, restart the SQL Server service to rebuild tempdb cleanly, since tempdb corruption cannot be repaired in place.
  • Review output for allocation errors (Msg 8944, 8928) tied to the same page IDs referenced in Error 1532.

Step 3: Validate Storage Subsystem Integrity

  • Open Event Viewer (eventvwr.msc) and inspect the System log under Windows Logs for Disk, ntfs, or storahci warnings around the time of the error.
  • Run chkdsk D: /f /r (replace D: with your data/log drive letter) during a maintenance window to repair file system-level inconsistencies.
  • Confirm disk write-caching policies in Device Manager > Disk drives > Properties > Policies tab; disable “Turn off Windows write-cache buffer flushing on the device” unless backed by a battery-backed controller.

Step 4: Apply the Latest SQL Server 2025 Cumulative Update

  • Navigate to the Microsoft Update Catalog and download the latest Cumulative Update (CU) for SQL Server 2025.
  • Install the update and restart the SQL Server service via services.msc or:
  net stop MSSQLSERVER
  net start MSSQLSERVER
  • Confirm the version update by running SELECT @@VERSION; in SSMS.

Step 5: Rebuild tempdb Configuration (If Issue Is Isolated to tempdb)

  • Move tempdb data/log files to a different, verified-healthy disk volume using:
  ALTER DATABASE tempdb MODIFY FILE (NAME = tempdev, FILENAME = 'E:\SQLTemp\tempdb.mdf');
  • Restart the SQL Server service to apply the new file location and confirm tempdb initializes without errors.

Alternative or Verification Steps

  • After applying fixes, re-run the original query under load (parallel sort scenario) and confirm no Error 1532 appears in the SQL Server Error Log for at least 24–48 hours.
  • If the issue persists despite clean DBCC CHECKDB results and updated patches, engage Microsoft Support with the SQL Server error log, DBCC CHECKDB output, and a memory dump (if available) for deeper engine-level analysis.