Send Special Arguments to the Access Method with -u

You can use the -u option to send special arguments to the access method. The possible arguments depend on the access method. For example, the R-tree access method supports the display option, as the following example shows: 
oncheck -pl -u "display"

Use commas to separate multiple arguments in the argument string.

For information on valid arguments for your access method, refer to the user manual for your access method.