IARとは？ OpenSimulator Inventory Archives (IARs) are a means by which inventory folders and items can be saved offline to a single file (an IAR). This file can then be loaded into a different OpenSimulator installation. IARs save all the necessary asset data required to fully restore the items including textures, sounds, scripts and objects contained in the inventory of other objects.
OARとは？ OpenSimulator archives (OAR) go a step further in that they can save all the necessary asset data so that you may fully restore the terrain, region parcel data, the textures of objects and their inventories when loaded onto a completely different system using a different asset database.
Loading large OARs using the default SQLite database plugin will take a very very long time (in the order of many hours). I highly recommend that you switch to MySQL if you want to load large archives.