| layout | title | permalink |
|---|---|---|
page |
Q21811: Maximum Number of Records in a Random Access File |
/pubs/pc/reference/microsoft/kb/Q21811/ |
Article: Q21811
Version(s): 1.00 1.01 1.02 2.00 2.01 3.00 4.00 4.00b 4.50
Operating System: MS-DOS
Flags: ENDUSER |
Last Modified: 22-JAN-1990
Question:
What is the largest number of records that I can use in a random
access file?
Response:
The maximum relative record number for QuickBASIC Versions 3.00 and
earlier is 16,777,215 (16 megabytes).
QuickBASIC Version 4.00 is capable of handling up to 2 to the 31st
power minus 1 (or 2,147,483,647), but DOS limits you to 32 megabytes
of one-byte records.
For all versions of QuickBASIC, a record length cannot exceed 32,767
bytes.
DOS versions up to Version 3.30 and OS/2 Version 1.00 limit you to a
total file size of 32 megabytes, or 32,768,000 bytes. The following
are two examples of the maximum number of records allowed:
1. 8.192 million records with 4 bytes each
2. 2.048 million records with 16 bytes each