VBA & Macro Problems

How to Diagnose High Memory Usage in Microsoft Access VBA

Phi Hung Vo Oct 23, 2026 869 views

Question details

The user needs to diagnose and resolve gradual memory consumption and 'Out of Memory' errors occurring in a long-running Microsoft Access VBA application connected to SQL Server.

How to Diagnose High Memory Usage in Microsoft Access VBA

Product: Microsoft Access
Device & OS: not provided
Scenario: Running a long-duration Microsoft Access VBA application that interacts with SQL Server.
Observed behavior: The application gradually consumes memory over time, eventually resulting in an Out of Memory error due to potential memory leaks, unreleased objects, or unusually long operations.

Before you start

Before diving into the VBA code, ensure your Microsoft Access version and SQL Server ODBC drivers are fully updated, as some underlying memory leaks are resolved in newer software patches.

Solution 1Recommended

Review VBA Code for Unreleased Objects

Identify and explicitly close recordsets, database connections, and forms to free up memory during long operations.

VBA does not have an automatic garbage collector that runs instantly. If objects are opened in a loop but never closed, memory is continually consumed until the application crashes.

Open the VBA Editor

Press ALT + F11 in Microsoft Access to open the Visual Basic for Applications (VBA) editor.

Locate Object Declarations

Search your code for any instantiated Recordsets, QueryDefs, Workspace, or Database objects (e.g., using 'Set rs = CurrentDb.OpenRecordset(...)').

Explicitly Close Objects

Ensure that every object opened has a corresponding '.Close' method called before the function or loop ends (e.g., 'rs.Close').

Set Variables to Nothing

Explicitly release the memory by setting the object variables to Nothing (e.g., 'Set rs = Nothing') immediately after closing them.

Memory Monitoring: Keep the Windows Task Manager open while testing specific blocks of your VBA code to observe exactly which procedure triggers the memory spike.

Solution 2

Isolate the Issue with a Minimal Reproducible Example

Strip down the application to the smallest possible code block that still produces the memory error to pinpoint the root cause.

Solution 3

Apply Workarounds and Review Performance Guidelines

Implement temporary application restarts and optimize queries according to Microsoft's performance guidelines to manage memory loads.

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Frequently Asked Questions

Why does my Access VBA code eventually give an 'Out of Memory' error?

This error typically occurs when VBA objects like Recordsets, forms, or database connections are opened inside a loop but never explicitly closed or set to 'Nothing'. Over time, this creates a memory leak, causing the application to consume all available system RAM until it crashes.

Does restarting Microsoft Access fix the memory leak?

Restarting Access is only a temporary workaround. Closing the application flushes the RAM and clears the immediate out-of-memory error, but the memory leak will occur again when you rerun the process unless the underlying VBA code is fixed to properly release objects.

How do I properly release an object in Access VBA?

To properly release an object and free up memory, you should first close the object using the '.Close' method (if applicable, such as for Recordsets) and then release the memory by setting the object variable to 'Nothing' (e.g., Set myRecordset = Nothing).

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