Re: relation bet REDO LOG FILE and BEGIN BACKUP

peter wrote:
> Hello DBAs,
>
> when we issue
> alter tablespace <tb_name> begin backup;
> what extra information go in redo log, why archive is fast and if there
> is shutdown abort why backup at that time is not useful........
>
> Because in books it was mentioned that archive is fast because all
> information of tablespace would go in redo log but even in simple way,
> everything goes in redo log so what extra..........

According to the documentation, begin backup forces Oracle *for every change* to write the complete block to redolog, instead of changed bytes only.

-- 
Sybrand Bakker
Senior Oracle DBA