Using Caché ObjectScript - InterSystems Documentation

Data Types and Values
There are no other escape sequences within ObjectScript string literals.
3.1.2 Concatenating Strings
You can concatenate two strings into a single string using the _ concatenation operator:
Concatenation
Set string = "Hello" _ " Goodbye"
Write string
3.1.3 Long Strings
By default, the maximum Caché string size is 32,767 characters. This default can be overridden by enabling long strings,
which increases the maximum length to 3,641,144 characters. You can use either of the following methods to enable or
disable long strings system-wide:
• In the Management Portal, select [System] > [Configuration] > [Memory and Startup]. On the System Memory and Startup
Settings page, select the Enable Long Strings check box. If a process was already running when you enabled long
strings, long strings will not be enabled for that process.
• In the Caché parameter file, specify the value of the EnableLongStrings parameter, as described in the EnableLongStrings
section of the Caché Parameter File Reference.
Caché also supports the use of long strings on an optional, per-instance basis. To enable long strings for the current instance,
use the EnableLongStrings property of the Config.Miscellaneous class.
Note:
Performance may be affected when long strings are enabled. Enabling long strings increases the amount of
memory allocated to the string stack by approximately 50 times. Caché uses the string stack for temporary string
handling during command execution. This larger string stack memory is allocated to each process, whether the
process uses long strings or not. You may need to retune your system to maintain performance.
When a process actually uses a long string, the memory for the string comes from the operating system’s malloc() buffer,
not from the partition memory space for the process. Thus the memory allocated for actual long string values is not subject
to the limit set by the maximum memory per process (bbsiz) parameter and does not affect the $STORAGE value for the
process.
3.2 Numbers
Topics related to numbers include:
• Fundamentals of Numbers
• Canonical Form of Numbers
• Non-Numeric Strings as Numbers
• Concatenating Numbers
• Fractional Numbers
16 Using Caché ObjectScript