RE: Wanna implement RAC.
- From: "Marquez, Chris" <cmarquez@xxxxxxxxxxxxxxxx>
- To: <chiragdba@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 4 Oct 2005 15:32:38 -0400
Chirag,
Wow, you got some the rudest and lamest comments I have ever seen.
I too have told people to RTFM...many times.
"How to I export a table?"
"How do I tune my database?"
"How do I do my taxes?"
These are all RTFM questions.
Also, I personally often try to convey my level of experience in a
subject area, good or bad, as to help the reader, help me.
In the context of a logical question I never see this as bragging.
Finally regarding one of your very "alarming" ;o) questions;
"RAC; "Scalability" option and *not* "High Availability" option"
It was a part of a subject in a long thread on this list!
Now to your questions;
---INSTALLING RAC
>> Can anyone have a good document for How to implement RAC?
Sure;
http://www.puschitz.com/InstallingOracle10gRAC.shtml
<http://www.puschitz.com/InstallingOracle10gRAC.shtml>
Installing Oracle Database 10g with Real Application Cluster (RAC) on
Red Hat Enterprise Linux Advanced Server 3
Werner Puschitz has some of the best installation docs out there...but
this is assuming you are on Linux...you did not say.
Other than that I would say Metalink has the install docs you are
looking for...but I use Werner Puschitz for Linux.
---WHAT IS RAC
>> [RAC] Only thing I know is that it is based on having multiple
instances
>> on different machine with sharing a same set of physical files.
Right!
>> HOW RAC HELPS FOR HIGHER AVAILABILITY?
That is debatable...some will say (even Oracle) that RAC is for
"Scalability", not "High Availability".
Personally, I don't hear to much about success or increasing
"Scalability" with RAC...I guess, but in 3 shops I personally have never
witnessed it come true.
I have only ever worked at shops the use RAC for "High
Availability"...node1 dies you are still running (or startup) on node2.
But RAC for "High Availability" is debatable....all about perceptive
really.
>> [RAC] the probability of failing the instance is less compared to
crashing the DB due to any reasons.
>> and we have single set of physical files(hope this is true), what to
do then?
"single set of physical"...yeah when ever I talk to a non RAC SysAdmin
they always say..."the disk is a single point of failure".
But not really...that is what RAID is for. Don't know of to many RAC
shops the have redundant everything, but not redundant disks.
Again, I have seen first hand RAC for "High Availability", but it is
debatable. I would say RAC is not for catastrophic failure, but help
for general availability.
"WHAT IS RAC"...you do not need the manuals...they will put you to sleep
at this high level.
You need a good white paper.
Try google...you have it in seconds.
hth
CHris Marquez
Oracle DBA
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