How can I increase the data loading speed

Hi Expert,
I need to populate a table cross dblink from another database each night. There are about 600,000 rows. It takes about two hours. This is the steps:
delete from target_table;
insert into target_table
select * from source_table@dblink;
commit;
I can't use truncate in case the loading fails that I still have the old data.
How can I increate the loading speed?
Thanks!

DELETE and INSERT /*+ APPEND */ aren't a good combination, as the high water mark will keep going up.
With a trivial number of rows like this I would not expect the delete or insert to be the problem. (How long does the delete take anyway?) It's more likely to be to do with the query over the db link. Is it just one table or is that a simplified example? Can you check the equivalent insert over on the remote database? If it's much faster I would investigate the network connection.

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