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Visual FoxPro Limits


Namespace: WIN_COM_API
Shamelessly copied from VFP help, and pasted here for reference purposes
Some capacities may be limited by available memory.
Category Feature Number

Table and Index Files

Maximum # of records per table file 1 billion
Maximum size of a table file 2 gigabytes
Maximum # of characters per record 65,500
Maximum # of fields per record(1) 255
Maximum # of tables open at one time(2) 255
Maximum # of characters per table field 254
Maximum # of bytes per index key in a non-compact index(3) 100
Maximum # of bytes per index key in a compact index(3) 240
Maximum # of open index files per table(2) unlimited
Maximum # of open indexes in all work areas(2) unlimited
Maximum # of relations unlimited
Maximum length of relational expressions unlimited

Field Characteristics

Maximum size of character fields 254
Maximum size of numeric (and float) fields 20
Maximum number of characters in field names in a free table 10
Maximum number of characters in field names in a table contained in a database 128
Minimum value of an integer -2,147,483,647
Maximum value of an integer 2,147,483,647
Digits of precision in numeric computations 16

Variables and Arrays

Default # of variables 1,024
Maximum # of variables 65,000
Maximum # of arrays 65,000
Maximum # of elements per array 65,000

Program and Procedure Files

Maximum # of lines in source program files unlimited
Maximum size of compiled program
modules(4)
64K
Maximum # of procedures per file unlimited
Maximum # of nested DO calls 128
Maximum # of READ nesting levels 5
Maximum # of nested structured programming commands 384
Maximum # of passed parameters 26
Maximum # of transactions 5

Report Designer Capacities

Maximum # of objects in a report definition(2) unlimited
Maximum length of a report definition 20 inches
Maximum # of grouping levels 128
Maximum length of character report variables 255

Other Capacities

Maximum # of open windows (all types)(2) unlimited
Maximum # of open Browse windows 255
Maximum # of characters per character string or memory variable 16,777,184
Maximum # of characters per command line 8,192
Maximum # of characters per label control on a report 252
Maximum # of characters per macro substituted line 8,192
Maximum # of open files System limit
Maximum keystrokes in keyboard macro 1,024
Maximum fields that can be selected by a SQL SELECT statement 255

1 If one or more fields allow null values, the limit is reduced by one to 254 fields.
2 Limited by memory and available file handles. .cdx files use only one file handle.
3 If the collating sequence is set to MACHINE, each character uses one byte. If the collating sequence is not set to MACHINE, each character uses two bytes. If the indexed field supports null values, one additional byte is used in the index key. Note that non-machine indexes are always compact.
4 A program module is one procedure. A program or application can contain an unlimited number of program modules.
Other miscellaneous limits should be listed in the VFP System Capacities documentation.

Maximum Number of Bytes Read Using Low-Level Functions
http://support.microsoft.com/default.aspx?scid=kb;en-us;105043&Product=fox

65,535 bytes is the maximum number that FREAD() and FGETS() can read at one time.

The maximum file size purported, but not documented, to be read by LLF I/O is 2Gb. (?)
Category Learning VFP
( Topic last updated: 2005.10.11 05:29:58 PM )