cmd_worldsize

command: /worldsize

quick ref:

/worldsize radius [center_x center_y center_z]

description:

set the world size. mostly used on 32/64bits server to prevent running out of memory. 
Please note, it does not affect regions(512*512) that are already loaded in memory. Combine this with /loadregion command to restrict 
severing of blocks in any shape. 
@param radius: in meters such as 512. 
@param center_x center_y center_z: default to current home position. 
e.g.
/worldsize 256