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Fix Microsoft Access Write Conflict After MySQL Database Migration

Adam Davis Sep 28, 2026 870 views

Question details

The user is experiencing continuous write conflict errors when attempting to open and interact with forms in a Microsoft Access frontend.

Product: Microsoft Access and MySQL
Device & OS: not provided
Scenario: Operating a Microsoft Access frontend connected via ODBC to a newly migrated MySQL backend database (previously SQL Server).
Observed behavior: Access displays a write conflict error message indicating that another user has modified the record when opening forms, even though there is only one active user connected to the database.

Before you start

Ensure that all users are disconnected from the Access frontend network share and temporarily disable any scheduled background tasks or automated scripts that might be updating the MySQL tables while you test the ODBC connection.

Solution 1Recommended

Verify Primary Keys in MySQL and Re-link Tables in Access

Microsoft Access requires well-defined primary keys to accurately track which records have been modified. Without them, Access may mistakenly assume that a background process has altered the data.

When migrating from SQL Server to MySQL, table metadata such as primary keys may not transfer correctly depending on the migration tool used. If Access cannot identify a unique identifier for a table over ODBC, it defaults to a read-only state or triggers false write conflicts upon form edits.

Check MySQL Primary Keys

Open your preferred MySQL management tool (such as MySQL Workbench) and verify that every table involved in your Access forms has a primary key explicitly defined.

Remove Old Linked Tables

Open your Microsoft Access frontend database. In the Navigation Pane, right-click the existing linked tables pointing to the MySQL backend and select 'Delete' to remove them.

Re-link Using ODBC

Navigate to the 'External Data' tab on the ribbon, click 'New Data Source', select 'From Other Sources', and then choose 'ODBC Database'.

Select Unique Identifiers

Follow the wizard to link your MySQL tables. If Access prompts you to 'Select Unique Record Identifier' for any table, ensure you manually select the field that corresponds to the primary key in MySQL.

Verify Primary Keys in MySQL and Re-link Tables in Access

Table-Level Testing: Before testing your forms, try opening the newly linked table directly in Datasheet view and editing a record. If the edit saves without a write conflict, the primary key configuration is successful.

Solution 2

Update MySQL ODBC Connector and Adjust Data Types

Outdated ODBC drivers or incompatible timestamp data types can cause Access to misinterpret MySQL record locking behaviors.

Solution 3

Review VBA Code and SQL Statements for Syntax Conflicts

SQL Server and MySQL handle query syntax and data macros differently. Leftover SQL Server-specific VBA code can trigger locking issues in a MySQL environment.

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Frequently Asked Questions

Why does Access say there is a write conflict when I am the only user?

This is typically a 'false' write conflict. It happens when Access cannot uniquely identify the record you are trying to edit, often because the linked MySQL table lacks a primary key. It can also happen if MySQL updates a background field (like a TIMESTAMP) automatically, making Access think another user modified the row.

Which ODBC driver should I use for Access and MySQL?

You should use the official MySQL Connector/ODBC. It is critical that you install the architecture version (32-bit or 64-bit) that matches your Microsoft Access installation, regardless of whether your Windows system is 64-bit.

How do I ensure Access recognizes my MySQL primary keys during linking?

When linking a MySQL table via ODBC, Access usually prompts you with a 'Select Unique Record Identifier' dialog if it cannot automatically detect the primary key. You must manually select the column(s) that act as the primary key in your MySQL schema before clicking OK.

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