Log on to the Ops Center API Configuration Manager server as a user with Administrator permissions (in Windows).
Configuration-Manager-installation-folder\data\properties\StartupV.properties
If the file does not exist or the file does not contain the rest.java.heapMemory.size property, this indicates that the default value is set.
Configuration-Manager-installation-folder\bin\setProperty rest.java.heapMemory.size 6144
After the command is run, the Ops Center API Configuration Manager server restarts. If you specify -noRestart at the end of the command line, the command will run without restarting the server.
When you run the setProperty command, the value of the rest.java.heapMemory.size property in the StartupV.properties file will be changed to 6144. If the file does not exist, it will be created.
Each time the command is run, the current StartupV.properties file is backed up. The backup file is created in the same directory and the name of the backup file will include the date and time of creation (for example, StartupV_20200220-093320.properties).