A warm restore restores noncritical storage spaces while the database server is in online or quiescent mode. It consists of one or more physical restore operations (when you restore multiple storage spaces concurrently), a logical-log backup, and a logical restore.
During a warm restore, the database server replays backed-up logical-log files for the storage spaces that you restore. To avoid overwriting the current logical log, the database server writes the logical-log files that you designate for replay to temporary space. Therefore, a warm restore requires enough temporary space to hold the logical log or the number of log files being replayed, whichever is smaller. For information on how the database server looks for temporary space, see the discussion of DBSPACETEMP in your IBM Informix: Administrator's Guide.
A warm restore can be performed after a dbspace has been renamed and a level-0 archive of the rootdbs and renamed dbspace is taken.