How to fix Error 1910 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 1910

Why This Error Happens

This error occurs when a table or view definition attempts to exceed SQL Server’s hard-coded limit of 1,024 columns per table (or 1,024 columns per non-indexed view), including columns added via ALTER TABLE statements. This is typically triggered by poorly normalized database schemas, auto-generated tables from ETL tools, or wide “sparse” reporting tables that accumulate columns over time. It can also surface when merging multiple tables via a JOIN into a single view that collectively exceeds the column ceiling.

Step-by-Step Resolution Guide

Step 1: Identify the Offending Object and Column Count

  • Open SQL Server Management Studio (SSMS) and connect to the Database Engine.
  • Run the following query to audit column counts across your database:
  SELECT t.name AS TableName, COUNT(c.column_id) AS ColumnCount
  FROM sys.tables t
  JOIN sys.columns c ON t.object_id = c.object_id
  GROUP BY t.name
  ORDER BY ColumnCount DESC;
  • Note the table or view name mentioned in the error message ‘%.*ls’ from the SQL Server log (located at C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Log\ERRORLOG on Windows Server 2025).

Step 2: Normalize the Database Schema

  • Split the wide table into multiple related tables using a 1-to-1 or 1-to-many relationship, linked by a common Primary/Foreign Key (e.g., TableName_Part1, TableName_Part2).
  • Move rarely-queried or archival columns into a separate “extension” table to reduce the primary table’s width.
  • If the error occurs during a CREATE VIEW statement, refactor the view to select only necessary columns using explicit column names instead of SELECT * across multiple joined tables.

Step 3: Adjust ETL or Schema Migration Scripts

  • If using SQL Server Integration Services (SSIS) or an ETL tool to auto-generate tables, check the source system for duplicate or auto-incrementing column generation logic that may be inflating column counts.
  • Update the .dtsx package or Python/C# ingestion script to pivot data into rows rather than dynamically creating new columns for every unique data point.

Step 4: Rebuild the Object

  • Drop the problematic object if it was partially created:
  DROP TABLE IF EXISTS dbo.YourTableName;
  • Re-run the corrected CREATE TABLE or CREATE VIEW script with the column count now under the 1,024 limit.

Alternative or Verification Steps

  • Verification: Re-attempt the CREATE TABLE or ALTER TABLE command in SSMS; if successful, confirm the structure using sp_help 'dbo.YourTableName' to ensure no data integrity was lost during normalization.
  • Alternative: If normalization is not immediately feasible, consider storing overflow attributes in a JSON or XML column type instead of discrete columns, as SQL Server 2025 offers enhanced native JSON indexing support for this exact use case.