Re: from Non-Archive-Mode to Archive-Mode

Raj,

I'm afraid I don't understand. Was that incorrect in some way? The alert log will contain information when the redo logs switch, e.g.

Thread 1 advanced to log sequence 38451
  Current log# 1 seq# 38451 mem# 0: /x12/oradata/IDW1/redo01a.dbf   Current log# 1 seq# 38451 mem# 1: /x22/oradata/IDW1/redo01rba.dbf Fri Jan 17 17:46:49 2003
Completed checkpoint up to RBA [0x9633.2.10], SCN: 0x0000.4f7c86d7 Completed checkpoint up to RBA [0x9632.2.10], SCN: 0x0000.4f7c86d5 Fri Jan 17 17:46:50 2003
Beginning log switch checkpoint up to RBA [0x9634.2.10], SCN: 0x0000.4f7c86d9 Thread 1 advanced to log sequence 38452
  Current log# 3 seq# 38452 mem# 0: /x12/oradata/IDW1/redo03a.dbf   Current log# 3 seq# 38452 mem# 1: /x22/oradata/IDW1/redo03b.dbf

This will help identify the frequency of log switch and an indicator to the amount of redo generated. The question was how to estimate the amount of archive log generation and that was one way. So, is that wrong? Please do correct me if you think so. Of course the information can be readily obtained from v$log_history; but then again, that's another way, not the only way.

Arup

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Friday, January 17, 2003 1:25 PM

>
> Arup,
>
> From your past replies to the list, I am surprised to hear you say this.
> "If you have placed the init.ora parameter log_checkpoints_to_alert set to
> TRUE, then your alert log file will have lines when the redo log group
> switch fom one to the other."
>
> Regards
> Raj
>
>
>
>
>
> "Arup Nanda"
> <arupnanda_at_ho To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> tmail.com> cc:
> Sent by: Subject: Re: from Non-Archive-Mode to Archive-Mode
> root_at_fatcity.
> com
>
>
> January 17,
> 2003 09:35 AM
> Please
> respond to
> ORACLE-L
>
>
>
>
>
>
> Murat,
>
> The estimate of amount of space for archive logs come from your redo log
> switch. If you have placed the init.ora parameter log_checkpoints_to_alert
> set to TRUE, then your alert log file will have lines when the redo log
> group switch fom one to the other. That will give you a rough idea of the
> time it takes to fill up a redo log. If you are using archiving, the redo
> log has to be written to disk. In any one given day, you can then calculate
> the archive log generation.
>
> Then comes how you want to back it up and clean up the space. If you have a
> process running that will scan for archive logs; back them to tape and then
> delete it, then you have to figure out how often this process runs and how
> much archive log stays on the disk before getting deleted.
>
> Changing the log mode of the tablespace level does not change teh redo log
> genration in most cases. If you define a tablespace or an object as
> nologging, only a few operations like ALTER TABLE .. PARTITION, ALTER INDEX
> REBUILD, direct load are not logged, all others are. And in any case the
> system tables are always logged.
>
> HTH.
>
> Arup
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Friday, January 17, 2003 5:08 AM
>
>
> > Hi,
> >
> > how can I calculate/estimate the extra disk space I'll need if I
> > change the log mode from non-archive-mode to archive-mode. I want to
> change
> > the log mode of all my objects. Do I need to do this one-by-one or is it
> > enough if I change the log mode of my tablesapces?
> >
> > Thanks in advance
> >
> > Murat
> >
> >
> >
> > --------------------------------------
> > Bu e-posta sadece yukarida isimleri belirtilen kisiler arasinda
> ozel
> > haberlesme amacini tasimaktadir. Size yanlislikla ulasmissa lutfen
> mesaji
> > geri gonderiniz ve sisteminizden siliniz. Rt.Net Internet
> Hizmetleri
> > Pazarlama ve Ticaret A.S. bu mesajin icerigi ile ilgili olarak hic
> bir
> > hukuksal sorumlulugu kabul etmez.
> >
> > This e-mail communication is intended for the private use of the
> persons
> > named above. If you received this message in error, please
> immediately
> > notify the sender and delete it from your system. Rt.Net
> Internet
> > Hizmetleri Pazarlama ve Ticaret A.S. does not accept legal
> responsibility
> > for the contents of this message.
> > --------------------------------------
> >
> >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: MURAT BALKAS
> > INET: murat.balkas_at_o2.net.tr
> >
> > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> > San Diego, California -- Mailing list and web hosting services
> > ---------------------------------------------------------------------
> > To REMOVE yourself from this mailing list, send an E-Mail message
> > to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> > the message BODY, include a line containing: UNSUB ORACLE-L
> > (or the name of mailing list you want to be removed from). You may
> > also send the HELP command for other information (like subscribing).
> >
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Arup Nanda
> INET: arupnanda_at_hotmail.com
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
>
>
>
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author:
> INET: Rajesh.Rao_at_jpmchase.com
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
>

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Arup Nanda
  INET: arupnanda_at_hotmail.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).