Sources
Delphi Russian Knowledge Base
DRKB - это самая большая и удобная в использовании база знаний по Дельфи в рунете, составленная Виталием Невзоровым

Ограничения Paradox

01.01.2007

Table and Index Files

127 — Tables open per system

64 — Record locks on one table (16Bit) per session

255 — Record locks on one table (32Bit) per session

255 — Records in transactions on a table (32 Bit)

512 — Open physical files (DB, PX, MB, X??, Y??, VAL, TV)

300 — Users in one PDOXUSRS.NET file

255 — Number of fields per table

255 — Size of character fields

2 — Billion records in a table

2 — Billion bytes in .DB (Table) file

10800 — Bytes per record for indexed tables

32750 — Bytes per record for non-indexed tables

127 — Number of secondary indexes per table

16 — Number of fields in an index

255 — Concurrent users per table

256 — Megabytes of data per BLOB field

100 — Passwords per session

15 — Password length

63 — Passwords per table

159 — Fields with validity checks (32 Bit)

63 — Fields with validity checks (16 Bit)

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