Technical Information Database
TI159B.txt Some current internal limits of BDE
Category :BIN
Platform :All
Product :BDE All
Description:
Here are the maximum limits for some common BDE objects. If you
find you cannot reach these limits or are getting an out of memory
error, increasing your SHAREDMEMSIZE in BDE Config to 4096 or more
should allow you to reach these limits.
GENERAL LIMITS
--------------
48 Clients in system
32 Sessions per client (3.5 and earlier, 16 Bit, 32 Bit)
256 Session per client (4.0, 32 Bit)
32 Open databases per session (3.5 and earlier, 16 Bit, 32 Bit)
2048 Open databases per session (4.0, 32 Bit)
32 Loaded drivers
64 Sessions in system (3.5 and earlier, 16 Bit, 32 Bit)
12288 Sessions in system (4.0, 32 Bit)
4000 Cursors per session
16 Entries in error stack
8 Table types per driver
16 Field types per driver
8 Index types per driver
48K Size of configuration (IDAPI.CFG) file
64K Size of SQL statement (RequestLive=False)
4K Size of SQL statement (RequestLive=True)
6K Size of SQL statement (RequestLive=True) (4.01, 32 Bit)
16K Record buffer size (SQL or ODBC)
31 Table and field name size in characters
64 Stored procedure name size in characters
16 Fields in a key
3 File extension size in characters
260 Table name length in characters
(some servers might have other limits)
260 Path and file name length in characters
15 Significant Digits
PARADOX LIMITS
--------------
127 Tables open per system (4.0 and earlier, 16 Bit, 32 Bit)
254 Tables open per system (4.01, 32 Bit)
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 (4.0 and earlier, 16 Bit, 32 Bit)
(DB, PX, MB, X??, Y??, VAL, TV)
1024 Open physical files (4.01, 32 Bit)
(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)
53 Fields with Validity checks added at one time
63 Number of Sessions with Tables open on 1 System
DBASE LIMITS
------------
256 Open dBASE tables per system (16 Bit)
350 Open dBASE tables per system (BDE 3.0 - 4.0, 32 Bit)
512 Open dBASE tables per system (BDE 4.01, 32 Bit)
100 Record locks on one dBASE table (16 and 32 Bit)
100 Records in transactions on a dBASE table (32 Bit)
1 Billion records in a table
2 Billion bytes in .DBF (Table) file
4000 Size in bytes per record (dBASE 4)
32767 Size in bytes per record (dBASE for Windows)
255 Number of fields per table (dBASE 4)
1024 Number of fields per table (dBASE for Windows)
47 Number of index tags per .MDX file
254 Size of character fields
10 Open master indexes (.MDX) per table
220 Key expression length in characters
Reference:
7/15/98 3:24:20 PM
Last Modified: 01-MAY-00