Microsoft Access Specifications

File size - 2 gigabytes minus the space needed for system objects

Number of objects in a database - 32,768

Modules (including forms and reports with the HasModule property set to True) - 1,000
Number of characters in an object name - 64
Number of characters in a password - 14
Number of characters in a user name or group name - 20
Number of concurrent users - 255

Table
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 may be less because of tables opened internally by Microsoft 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;
1 gigabyte 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
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 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 ANDs in a WHERE or HAVING clause - 99
Number of characters in an SQL statement approximately - 64,000

Form and report
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 - 200 in. (508 cm)
Number of levels of nested forms or reports - 7
Number of fields or expressions 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 .mdb and .adp) - 32,750
Macro
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

re: Microsoft Access Specifications

Wow, what a useful post.

I have already been hit by the number of indicies on a table, and the number of fields in a table but this one was new to me
In the late 90's I wrote a system for 400 users. Never had any problem, as I doubt more than 50 odd where logged on at anyone time, but never realised there was a 255 limit.

This article needs printing off and filed for future reference, thanks

re: Microsoft Access Specifications

Is there a way of changing the length of a form beyond the 22in limit?

re: Microsoft Access Specifications

Why would you want to? It would be pretty unmanagable.

re: Microsoft Access Specifications

The answer, of course, is no! And as Mary pointed out, even if you could, it would be very user un-friendly! If you're running into this kind of real esatate problems you need to expand horizontally, using Tabbed Pages! They really are great for things other than just subforms!

Check out

Using Tabbed Pages on a Form

Linq ;0)>