JOINING local table and DB Link table performance

Question

Hellou everybody,
can somebody tell me how it is work in Oracle DB when you want to join some local table and DB Link table for example:
Select a.col1, b.col2
from local_table a , remote_table@dblink b
where a.key = b.key;
and when I use DRIVING_SITE hint and the all data from remote table is transforming (pushing) into my DB (in some temporar space), it will transform although Indexes from remote table?
So when I use some JOINS, this joins will be fast enought? Will they using remote table indexes to query the data or not?
Thank you for response.
Zoffob

Answer 1

user10708026 wrote:
Is it as simple as:No. Use:
UPDATE  habitationalsupplement live_hab
   SET  primaryheatingapparatuscode = (
                                       SELECT  hab_backup.primaryheatingapparatuscode
                                         FROM  habitationalsupplement@backupdb hab_backup
                                         WHERE hab_backup.itemobjectid = live_hab.itemobjectid
                                           AND hab_backup.itemversionnumber = live_hab.itemversionnumber
  WHERE (itemobjectid,itemversionnumber) IN (
                                             SELECT  hab_backup.itemobjectid,
                                                     hab_backup.itemversionnumber
                                               FROM  habitationalsupplement@backupdb hab_backup
/SY.