Uniface Maximums

The maximum values that occur throughout Uniface are inherent limits that you need to consider as you develop applications. Your DBMS or operating system may impose further restrictions of its own.

Uniface uses UTF-8 as its internal characters set and this is used when calculating limits in bytes. Characters in other character sets (as defined by $DEF_CHARSET and $SYS_CHARSET) are converted to UTF-8, which can mean that a value may fit in your system character set, but is too large for UTF-8.

Various Maximum Values
What	Maximum
Limits for Uniface:
Number of parameters on command line	64
Number of characters per parameter on command line	256
Number of characters on command line	16384 Your operating system limit applies
Size of a search profile	8192 bytes (UTF8)
Number of operators for `read u_where` and for retrieve profile in component	Limited by available memory, and the limits imposed by the database connectors
Size of a signature parameter for C and COM call-in and call-out	10 MB
Size of a string parameter for web service call-out	400 MB on 32-bit systems, 1 GB on 64-bit systems.
Size of a Uniface component signature parameter	2 GB (UTF8)
Limits for global objects:
Length of object names	—
Value of a counter	2,147,483,647
Number of items in a Menu	99
Limits for entities:
Number of fields in one entity	Your DBMS limit applies
Size of a fixed-length part of record	See DBMS Connector Limits
Size of an index or primary key	See DBMS Connector Limits
Number of relationships for a foreign key (in a supertype)	64
Limits for fields:
Number of places defined right of decimal in a packing code	9
Length of a display format	31 characters
Lines of text entered in a unifield	32,766
Length of data in an edit box	64 KB (UTF8)
Limits for components:
Size of a component, width	340 character cells
Size of a component, height	1000 lines
Size of a component window, width	340 character cells
Size of a component window, height	600 lines
Number of fields painted	About 4000
Size of label	255 bytes (UTF8)
Length of a logical widget name	16 characters
Size of a radio group (The maximum size of the ValRep for a radio group is 512 bytes. This is about 25 buttons of average size.)	About 25
Size of a ValRep list in a list box, drop-down list, or combo-box	32768 items1

Limits of the ProcScript language:
Length of a message string set by askmess or message	512 bytes (UTF8)
Length of an askmess reply string	512 bytes (UTF8)
Number of replies for askmess	25
Length of a component constant or global constant name	32 characters
Length of a component constant or global constant description	25 characters
Length of a single ProcScript statement	1000 bytes (UTF8)
Length of the contents of a trigger	10 MB (UTF8)
Length of a ProcScript label	128 characters
Limits of the Configuration Files:
Length of a line in an assignment file	1023 characters (228 on iSeries)