Ограничения Foxpro

Table and Index Files

Max. # of records per table — 1 billion*

Max. # of chars per record — 65,000

Max. # of fields per record — 255

Max. # of open DBFs —  225

Max. # of chars per field — 254

Max. # of chars per index key (IDX) 100

Max. # of chars per index key (CDX) 240

Max. # of open index files per table unlimited**

Max. # of open index files in all work areas unlimited**

* The actual file size (in bytes) cannot exceed 2 gigabytes for single-user or exclusively opened multi-user tables. Shared tables with no indexes or .IDX indexes cannot exceed 1 gigabyte. Shared tables with structural .CDX indexes cannot exceed 2 gigabytes.

** Limited by memory. In FoxPro for MS-DOS and FoxPro for Windows, also limited by available MS-DOS file handles. Each .CDX file uses only 1 file handle. The number of MS-DOS file handles is determined by the CONFIG.SYS FILES parameter.

Field Characteristics

Max. size of character fields — 254

Max. size of numeric fields —  20

Max. # of chars in field names — 10

Digits of precision in numeric computations 16

Взято с Delphi Knowledge Base: https://www.baltsoft.com/