ORACLE IMP STATISTICS参数

STATISTICS
 Default: ALWAYS
 
 Specifies what is done with the database optimizer statistics at import time.
 The options are:
 
 ALWAYS
 Always import database optimizer statistics regardless of whether or not theyare questionable.
 
 NONE
 Do not import or recalculate the database optimizer statistics.
 
 SAFE
 Import database optimizer statistics only if they are not questionable. If they arequestionable, recalculate the optimizer statistics.
 
 RECALCULATE
 Do not import the database optimizer statistics. Instead, recalculate them onimport.