If you see a heap size error when running the data wizard, you can adjust how many records we process per execution. The fewer the records, the less memory used. The import will run a little slower, but for most people this will not be noticeable.

The Solution

There are two settings that control how many records the data wizard processes at a time, and both should be reduced when you hit a heap size error.

1. Go to the Mailchimp Settings tab.
2. Select Maintenance from the menu.
3. Click on Settings from the dropdown next to Reports.
4. Locate the 'Data Wizard SOQL records per execution' setting and change the value to 100.
5. Locate the 'Data Wizard Report records per execution' setting and change the value to 100.
6. Save the settings.

If necessary, you can reduce them further, ultimately to 1 record each. If you reach 1, then you should probably check other custom code, flows, or processes that are running outside of our product.

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