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System Limits |
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This section lists PxPlus system limits (these are subject to any operating system constraints of memory and resources). There is also a general limit of 2GB on all data storage.
The following are preset limits for PxPlus Basic Programs:
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For PxPlus Basic Programs |
Limit |
Notes |
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Array (32-bit platforms), max elements (millions) |
10 |
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Array, dimensions |
3 |
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Command line (32-bit platforms), max characters |
512 |
Entire length includes path, parameters and arguments. |
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COM interface method calls, max arguments |
20 |
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Device Driver name length |
12 |
This is the size of the filename as it exists in the *dev directory. |
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Line number, highest |
64999 |
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Memory, max GB |
2 |
... or the maximum the operating system allows, whichever is smaller. |
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Mnemonics, max characters (billion) |
2 |
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String length for data Precision, digits of accuracy |
18 |
Default |
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Program size (32-bit platforms), max GB |
2 |
... or the maximum the operating system allows, whichever is smaller. |
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Record limit, max bytes per record |
10240 |
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Statement label, max characters |
127 |
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Statement length, max in KB |
32 |
(The maximum statement length limit increased to 32 in PxPlus 2019 Update 2.) |
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Statement length (console editing), max in KB |
4 |
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String size, max GB |
2 |
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TCP sockets max connections |
65535 |
The limit is 16 in Windows 95/98. |
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TCP/IP address, max characters |
256 |
(The maximum number of characters increased to 256 in PxPlus 2018.0002.) |
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Variable name, max characters |
127 |
This would include the leading or trailing percent sign as in the case of a global variable or integer. |
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WebServer port, highest port number |
65535 |
Values below 2000 reserved for standard Internet activities. |
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Window size limits |
255 |
Maximum is 225 for lines and 255 for columns. |
The following are preset limits for PxPlus Data Files:
|
For Data Files |
Limit |
Notes |
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Channels, max number |
127 or 65000 |
See 'XF' system parameter. |
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File size, max bytes |
2 ^ 31-1 |
See 'MB'= system parameter. |
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Files, max number open concurrently |
500 |
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Key segments (VLR/FLR files) |
48 - 96 |
The maximum number of segments for a keyed file is 96; however, some segment options take up two segment positions (such as key suppression). Use of these options will reduce the maximum number of segments. |
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Key I/O buffers, max number |
100 |
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Keys, max number of |
16/256 |
0 - 15 for VLR/FLR, or 0 - 255 for EFF. |
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Key max length |
127/240 |
No key segment can exceed 127 bytes, and the maximum length of a multi-segment key is 240. Note: |
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Record size (fixed), max bytes |
32167 |
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Record size (variable length), max bytes |
31000 / 2GB |
The limit is 32000 when the extended record size option is not used. When this option is used, the maximum is 2GB. |
With this increased string limit, a few internal logical limitations have been imposed to avoid passing excessively long strings to some of the system functions.
The following functions/directives are restricted to 8KB string lengths:
CALL subprogram names/entry point names
LIST_BOX LOAD for a single line
SYSTEM_HELP command
STR( ) function format masks
SYS( ) function system command
XEQ( ) pathname
EVS( ) / EVN( ) expressions
MSK( ) mask definition
DAY_FORMAT and DTE( ) formats
'SZ'= Maximum Memory Size for Session