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catalog datacopy file very slow [message #682648] Thu, 05 November 2020 00:38 Go to next message
otoce
Messages: 3
Registered: November 2020
Junior Member
Hi,

i'm backup guy, very little knowledge of oracle. We have datacopy file on nfs share (10g network), cataloged datafile copy is preaty slow from my point of view, around 5 per min. Is this normal, could it be faster with some tuning ?

thanks
Re: catalog datacopy file very slow [message #682649 is a reply to message #682648] Thu, 05 November 2020 00:47 Go to previous messageGo to next message
Michel Cadot
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Registered: March 2007
Location: Nanterre, France, http://...
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Most likely NFS issue.
Use "dd" to estimate its performances.

Re: catalog datacopy file very slow [message #682657 is a reply to message #682648] Thu, 05 November 2020 09:17 Go to previous messageGo to next message
EdStevens
Messages: 1330
Registered: September 2013
Senior Member
Hard to say without knowing exactly what " datacopy file" or "datafile copy" actually is. Cannot comment on code I cannot see.

That said, it sounds like you might simply be copying (at an OS level) the data files of the database. If that is so, and your database is not shut down when you do that, then those backups are pretty much worthless, as the files will be inconsistent. Backing up a database is much more involved than backing up, say, a directory of Word documents. That's why oracle provides their 'rman' utility.
Re: catalog datacopy file very slow [message #682665 is a reply to message #682657] Fri, 06 November 2020 04:13 Go to previous messageGo to next message
otoce
Messages: 3
Registered: November 2020
Junior Member
Hi,

thanks for answers. Little bit more on env.INC backup is done with rman (and first FULL also). After that INC is merged with FULL backup on Data domain, outside of rman knowledge. Then new full backup have to be reported to rman with:
catalog datafilecopy '/datadomain/xxx/SNAPSHOT/20201104-21:18:08/xxx_TS_xxx_DAT_FNO_73.bkp' TAG='xxx_FULL_20201104-21:18:08';

and this is very slow, 5 per min.

Server is heavy loaded so dd is also pretty slow to nfs and to local disk (san):

local disk:
for i in {1..10}; do time dd if=/dev/zero of=/localdisks/ttf/test$i.img bs=536870912 count=1 ;done
1+0 records in.
1+0 records out.

real 0m7.529s
user 0m0.001s
sys 0m0.954s
1+0 records in.
1+0 records out.

real 0m6.854s
user 0m0.000s
sys 0m0.979s
1+0 records in.
1+0 records out.

nfs:
for i in {1..10}; do time dd if=/dev/zero of=/nfs/xxx/temp/test$i.img bs=536870912 count=1 ;done
1+0 records in.
1+0 records out.

real 0m4.493s
user 0m0.001s
sys 0m0.946s
1+0 records in.
1+0 records out.

real 0m4.446s
user 0m0.001s
sys 0m0.879s
1+0 records in.
1+0 records out.

lsof |grep -c .
138808

[Updated on: Fri, 06 November 2020 04:14]

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Re: catalog datacopy file very slow [message #682667 is a reply to message #682665] Fri, 06 November 2020 05:20 Go to previous messageGo to next message
Michel Cadot
Messages: 67919
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator

So your problem is in the first place with your IO subsystem not with Oracle.

Re: catalog datacopy file very slow [message #682671 is a reply to message #682667] Sat, 07 November 2020 23:58 Go to previous message
otoce
Messages: 3
Registered: November 2020
Junior Member
it's solved with: catalog start with '/xxx/xxx/SNAPSHOT' noprompt;

thanks for help
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