Just as any application, MS Access has specifications and limitations that should be remembered. The following tables specify the maximum sizes and numbers of various objects defined in Microsoft Access databases.
2 gigabytes, minus the space needed for system objects Note: Although the maximum size for a single database file is 2GB, you can work around this limitation by using a split database. A front-end database file can point to thousands of back-end database files, each of which could be as large as 2GB.
Number of objects in a database
32,768
Number of modules (including forms and reports that have the HasModule property set to True)
1,000
Number of characters in an object name
64
Number of characters in a password
20 (for MS Access 2007) 14 (for MS Access 2003)
Number of characters in a user name or group name
20
Number of concurrent users
255
Table
Attribute
Maximum
Number of characters in a table name
64
Number of characters in a field name
64
Number of fields in a table
255
Number of open tables
2048; the actual number might be smaller because of tables opened internally by Access
Table size
2 gigabyte minus the space needed for the system objects
Number of characters in a Text field
255
Number of characters in a Memo field
65,535 when entering data through the user interface; 2 gigabytes (for MS Access 2007) and 1 gigabyte (for MS Access 2003) of character storage when entering data programmatically
Size of an OLE Object field
1 gigabyte
Number of indexes in a table
32
Number of fields in an index
10
Number of characters in a validation message
255
Number of characters in a validation rule
2,048
Number of characters in a table or field description
255
Number of characters in a record (excluding Memo and OLE Object fields) when the UnicodeCompression property of the fields is set to Yes
4,000
Number of characters in a field property setting
255
Query
Attribute
Maximum
Number of enforced relationships
32 per table, minus the number of indexes that are on the table for fields or combinations of fields that are not involved in relationships*
Number of tables in a query
32*
Number of joins in a query
16*
Number of fields in a recordset
255
Recordset size
1 gigabyte
Sort limit
255 characters in one or more fields
Number of levels of nested queries
50*
Number of characters in a cell in the query design grid
1,024
Number of characters for a parameter in a parameter query
255
Number of AND operators in a WHERE or HAVING clause
99*
Number of characters in an SQL statement
Approximately 64,000*
*Maximum values might be lower if the query includes multivalued lookup fields.
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