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MessageMladen, one correction or comment. You don't need a third party =
package if you are backing up to disk. Then it's straight rman.
Ruth
- Original Message -----=20
From: Gogala, Mladen=20
To: Multiple recipients of list ORACLE-L=20
Sent: Wednesday, July 16, 2003 11:39 AM
Subject: RE: RMAN & SQL Backtrack
I don't have any experience with SQL*Backtrack and I do have some =
experience
with RMAN. Here are my comments:
- RMAN is reliable. Once you write the backup scripts, they are =
executed by operations
and there no surprises. In order to rely on those scripts, one =
needs to test them, especially
the recovery part.
- RMAN needs a 3rd party backup software to run. Things like =
OmniBackup, Tivoli, Legato or
SyncSort can be rather expensive. RMAN doesn't write to tapes =
itself. RMAN delegates a
backup software contacted through the routines from libobk.so (or =
libobk.dll or libobk.sl) to
do its writing. To get the "libobk.so" from you backup software =
vendor of choice, you generally=20
have to write a check. That means that RMAN is NOT free.
- Before version 9, RMAN was arcane and hard to learn. Thanks to =
Robert Freeman, it is no=20
longer so. You can learn how to configure and use RMAN and you can =
find a decent book
to learn RMAN from. It's not very hard and it's fairly logical. =
One reading of the books suffices=20
for a good general understanding.
- Quality of the software: RMAN leaves a lot to be desired. Its =
biggest drawback is the fact that
it doesn't do any coordination with the underlying backup catalog. =
In other words, you can happily
declare backup obsolete in RMAN and Legato will not know anything =
about it and vice versa.
You can even delete backup in Legato and reuse the tape while =
RMAN knows nothing about it.
On the other hand, RMAN, in contrast to all other methods, does =
not put tablespaces into the
backup mode, thus generating floods of redo archives. RMAN =
doesn't backup data blocks that=20
have never been used ("behind the watermark blocks"), which is =
great if you have a fresh new
datafile which was added to the tablespace just in case something =
might run out of space.
- Personnel. Despite the certification process, it is not always =
easy to find a trained personnel
which knows how to use it and how to recover the database. I =
consider the ability to recover
the database a basis for someone to call himself/herself a DBA. =
You would be surprised how
many people which claim that title do not know how to recover the =
database. Even smaller number=20
knows how to use RMAN.
- I would suggest Jared Still, Cary Millsap, Rachel Carmichael, =
Jonathan Lewis, Wolfgang Breitling,=20
Steve Adams, Gaja V., Arup Nanda, Kirti Deshpande and Anjo Kolk =
to start the Oracle List certification
process. I would trust that one more then the OCP. I apologize to =
anyone who I might have forgotten.
Mladen Gogala=20
Oracle DBA=20
Phone:(203) 459-6855=20
Email:mgogala_at_oxhp.com=20
-----Original Message-----
From: Smith, Ron L. [mailto:rlsmith_at_kmg.com]
Sent: Wednesday, July 16, 2003 10:59 AM
To: Multiple recipients of list ORACLE-L
Subject: RMAN & SQL Backtrack
We have been using SQL Backtrack for backup and recovery for about 6 =
years now. We are being pressured to start using RMAN because it is =
free. Makes sense but I am wondering about reliability, complexity, =
learning curve, etc...
Has anyone had experience with both products or anyone new to RMAN =
that can give me an idea of what to expect?
Thanks!
Ron
If you are not the intended recipient of this e-mail message, any =
use, distribution or copying of the message is prohibited. Please let me =
know immediately by return e-mail if you have received this message by =
mistake, then delete the e-mail message. Thank you.
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<DIV><FONT face=3DArial size=3D2>Mladen, one correction or comment. You =
don't need a=20
third party package if you are backing up to disk. Then it's =
straight=20
rman.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Ruth</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3DMGogala_at_oxhp.com href=3D"mailto:MGogala_at_oxhp.com">Gogala, =
Mladen</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3DORACLE-L_at_fatcity.com=20
href=3D"mailto:ORACLE-L_at_fatcity.com">Multiple recipients of list =
ORACLE-L</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, July 16, 2003 =
11:39=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: RMAN & SQL=20
Backtrack</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D937141214-16072003>I=20
don't have any experience with SQL*Backtrack and I do have some=20
experience</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D937141214-16072003>with=20
RMAN. Here are my comments:</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D937141214-16072003>a)=20
RMAN is reliable. Once you write the backup scripts, they are executed =
by=20
operations</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> and there no surprises. =
In order=20
to rely on those scripts, one needs to test them,=20
especially</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> the recovery=20
part.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D937141214-16072003>b)=20
RMAN needs a 3rd party backup software to run. Things like OmniBackup, =
Tivoli,=20
Legato or</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> SyncSort can be rather =
expensive.=20
RMAN doesn't write to tapes itself. RMAN delegates =
a</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> backup software =
contacted through=20
the routines from libobk.so (or libobk.dll or libobk.sl)=20
to</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> do its writing. To get =
the=20
"libobk.so" from you backup software vendor of choice, you generally=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> have to write a check. =
That means=20
that RMAN is NOT free.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D937141214-16072003>c)=20
Before version 9, RMAN was arcane and hard to learn. Thanks to Robert =
Freeman,=20
it is no </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> longer so. You can learn =
how to=20
configure and use RMAN and you can find a decent =
book</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> to learn RMAN from. It's =
not very=20
hard and it's fairly logical. One reading of the books suffices=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> for a good general=20
understanding.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D937141214-16072003>d)=20
Quality of the software: RMAN leaves a lot to be desired. Its biggest =
drawback=20
is the fact that</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> it doesn't do any =
coordination=20
with the underlying backup catalog. In other words, you can=20
happily</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> declare backup obsolete =
in RMAN=20
and Legato will not know anything about it and vice =
versa.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> You can even delete =
backup in=20
Legato and reuse the tape while RMAN knows nothing about=20
it.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> On the other hand, =
RMAN, in=20
contrast to all other methods, does not put tablespaces into=20
the</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> backup mode, thus =
generating=20
floods of redo archives. RMAN doesn't backup data blocks that=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> have never been =
used=20
("behind the watermark blocks"), which is great if you have a fresh=20
new</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> datafile which was =
added to=20
the tablespace just in case something might run out of=20
space.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003>e) Personnel. Despite the =
certification=20
process, it is not always easy to find a trained =
personnel</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> which knows how to =
use it=20
and how to recover the database. I consider the ability to=20
recover</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> the database a =
basis for=20
someone to call himself/herself a DBA. You would be surprised=20
how</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> many people which =
claim that=20
title do not know how to recover the database. Even smaller number=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> knows how to use=20
RMAN.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003>f) I would suggest Jared Still, =
Cary=20
Millsap, Rachel Carmichael, Jonathan Lewis, Wolfgang Breitling,=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> Steve Adams, Gaja V., =
Arup Nanda,=20
Kirti Deshpande and</SPAN></FONT><FONT face=3DArial =
color=3D#0000ff=20
size=3D2><SPAN class=3D937141214-16072003> Anjo Kolk to start =
the Oracle=20
List certification</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003> process. =
</SPAN></FONT><FONT=20
face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D937141214-16072003>I would trust=20
that one</SPAN></FONT><FONT face=3DArial color=3D#0000ff =
size=3D2><SPAN=20
class=3D937141214-16072003> more then the OCP. I apologize to =
anyone who I=20
might have forgotten.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D937141214-16072003></SPAN></FONT> </DIV>
<DIV> </DIV>
<P><FONT face=3DArial size=3D2>Mladen Gogala</FONT> <BR><FONT =
face=3DArial=20
size=3D2>Oracle DBA</FONT> <BR><FONT face=3DArial size=3D2>Phone:(203) =
459-6855</FONT> <BR><FONT face=3DArial =
size=3D2>Email:mgogala_at_oxhp.com</FONT> </P>
<BLOCKQUOTE style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> Smith, Ron L.=20
[mailto:rlsmith_at_kmg.com]<BR><B>Sent:</B> Wednesday, July 16, 2003 =
10:59=20
AM<BR><B>To:</B> Multiple recipients of list =
ORACLE-L<BR><B>Subject:</B>=20
RMAN & SQL Backtrack<BR><BR></DIV></FONT>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D328505213-16072003>We =
have been=20
using SQL Backtrack for backup and recovery for about 6 years=20
now. We are being pressured to start using RMAN because it is=20
free. Makes sense but I am wondering about reliability, =
complexity,=20
learning curve, etc...</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D328505213-16072003></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN =
class=3D328505213-16072003>Has anyone had=20
experience with both products or anyone new to RMAN that can give me =
an idea=20
of what to expect?</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D328505213-16072003></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D328505213-16072003>Thanks!</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D328505213-16072003></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D328505213-16072003>Ron</SPAN></FONT></DIV>
<P><FONT face=3DArial size=3D2>If you are not the intended recipient =
of this=20
e-mail message, any use, distribution or copying of the message is=20
Received on Wed Jul 16 2003 - 10:25:23 CDT
