ObjectSpace :: extentCount - Get number of allocated extents
The number of extents created for the object space does not necessarily include all defined extents, since extents are created on demand when being accessed the first time.
Return value: Number of items ( int32 )
The value contains the number of items to be processed or stored in a collection.
Implementation details
int32
ObjectSpace  :: extentCount (  )
The function returns the number of extents currently created for the object space.