In a Microsoft Access database, when you create a Memo field that includes an index or you create a field name that includes the automatically indexed text, you cannot enter the text that includes more than approximately 3450 characters into the field. When you try to enter more text into the field or try to edit the existing data, you receive the following error message:

If you must enter a large amount of text in the Memo field, delete the index for the Memo field. To do so follow these steps:

1. Open the table with the Memo field in Design view.
2. On the View Menu, click Indexes.
   
   Note In Microsoft Office Access 2007, click the Design tab, and then click Indexes in the Show/Hide group.
3. Click the index for the Memo field, and then delete it.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

This behavior does not occur in versions of Microsoft Access before Microsoft Access 2000 because Memo fields could not be indexed in Jet 3.5 and earlier.

Steps to reproduce the behavior in Access 2003

1. In a new database, create a new table with the following properties, and then save it as Table1:

      Table: Table1
      ------------------------
      Field Name: Id
         Data Type: AutoNumber
         Primary Key
      
      Field Name: MyCode
         Data Type: Memo
   					

2. Add the following record to the Table1 table:

      Id        MyCode
      ------------------------------------
      1         This is the Memo test data
   
   					

3. Copy the following SQL statement, paste it into a new query in SQL view, and then save the query as query1:
   UPDATE Table1 SET Table1.MyCode = [MyCode] & " " & [MyCode];
4. Create the following module, and then save it Module1:

   Sub TestMemoUpdate()
       Dim i As Integer
       Docmd.setwarnings false
       For i = 1 To 10
       Docmd.openquery "Query1"   
       Next i
       Docmd.setwarnings true
   End Sub
   					

5. Place your pointer so that it is in the procedure. Press F5 to run the code.