Database specifications
The following list of tables is specific to Microsoft Office Access 2007 databases:

General
Attribute Maximum
Access database (.accdb) file size 2 gigabytes, minus the space needed for system objects

Note   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. For more information, see the topic, Split a database.

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
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 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.

Form and report
Attribute Maximum
Number of characters in a label 2,048
Number of characters in a text box 65,535
Form or report width 22 in. (55.87 cm)
Section height 22 in. (55.87 cm)
Height of all sections plus section headers (in Design view) 200 in. (508 cm)
Number of levels of nested forms or reports 7
Number of fields or expressions that you can sort or group on in a report 10
Number of headers and footers in a report 1 report header/footer;
1 page header/footer;
10 group headers/footers
Number of printed pages in a report 65,536
Number of controls and sections that you can add over the lifetime of the form or report 754
Number of characters in an SQL statement that serves as the Recordsource or Rowsource property of a form, report, or control (both .accdb and .adp) 32,750
Macro
Attribute Maximum
Number of actions in a macro 999
Number of characters in a condition 255
Number of characters in a comment 255
Number of characters in an action argument 255
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Project specifications
The following list of tables is specific to Office Access 2007 projects:

General
Attribute Maximum
Number of objects in an Access project (.adp) 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 columns in a table 250 (Microsoft SQL Server 6.5)

1024 (Microsoft SQL Server 7.0, 2000 and 2005)

Microsoft SQL Server database
Microsoft SQL Server maximum capacity specifications are described in the SQL Server documentation.
Form and report
Attribute Maximum
Number of characters in a label 2,048
Number of characters in a text box 65,535
Form or report width 22 in. (55.87 cm)
Section height 22 in. (55.87 cm)
Height of all sections plus section headers (in Design view) 200 in. (508 cm)
Number of levels of nested forms or reports 7
Number of fields or expressions that you can sort or group on in a report 10
Number of headers and footers in a report 1 report header/footer;
1 page header/footer;
10 group headers/footers
Number of printed pages in a report 65,536
Number of controls and sections you can add over the lifetime of the form or report 754
Number of characters in an SQL statement that serves as the Recordsource or Rowsource property of a form, report, or control (both .accdb and .adp) 32,750
Macro
Attribute Maximum
Number of actions in a macro 999
Number of characters in a condition 255
Number of characters in a comment 255
Number of characters in an action argument 255

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