Where to config Oracle SQL Developer’s heap size

It is in “sqldeveloper\ide\bin\ide.conf”

# Set the default memory options for the Java VM which apply to both 32 and 64-bit VM's.
# These values can be overridden in the user .conf file, see the comment at the top of this file.
AddVMOption  -Xms1024M
AddVMOption  -Xmx2048M

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