Re: Amount of redo

Querying V$LOG_HISTORY should help, but it will only tell you how many log switches occurred. You can get a good ballpark-estimate figure by counting the rate of log switches per day and multiplying by the size of your
(largest) online redo log files. In SQL*Plus:

    column mb new_value V_MB
    select max(bytes)/1048576 mb
    from v$log;

    col cnt format 999,990
    col est_vol_of_redo format 999,990.00     select trunc(first_time), count(*) cnt, count(*) * &&V_MB est_vol_of_redo

    from v$log_history
    group by trunc(first_time);

...or something like that. As you can see, if you have multiple-sized online redo log files (a *very* bad practice!), the calculated volume could be unduly high. Also, if something has been causing log switches to occur short of filling the log files (i.e. frequent ALTER SYSTEM SWITCH LOGFILE, frequent SHUTDOWN, etc), then the calculated volume will be unduly high as well. But it's probably better to err on the high side anyway...?

Hope this helps...

-Tim

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, August 14, 2002 6:08 AM

Hi List,

I want to put my databse in archive mode(Presently it is non archive mode).I want to estimate
space that will be required for archive log taking we will be keeping one week archive on disk. How can i find out amount of redo generated in a week.

Regards
Pawan Dalmia
Extn -5259

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Author: Pawan Dalmia
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