physical_library

   A single directory containing an SCA database. The directory
   should not contain anything else. SCA always locks an entire
   physical library when it accesses it. When you are reading a
   physical library (for example, with a FIND command), other users
   are not allowed to write to the physical library, but other users
   are allowed to read the physical library. When you are writing
   to a physical library (for example, using LOAD), no other user is
   allowed to read or write to the physical library.