Verifying the Amount of Data for Conversion
Large amounts of data can potentially cause a timeout that can result in lost field customizations. Before running a field type conversion, you should verify the number of affected records included in the conversion.
Some ways you can verify the number of affected records include:
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Review field usage. Depending on what the field is used for, you may know if it affects a large numbers of records.
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Create a saved search or workbook of the data with a condition such as the custom field value isn't empty, or the custom checkbox field isn't checked. The results can help you determine how many records would be affected by a type conversion. If a field is applied to more than one record type, such as Employee and Contact, you must complete two searches or queries and combine the totals.