Comments for AskDba.org Weblog

Comment on Solving ORA-1031 while connecting as “/ as sysdba” : by Amit

Amit — Thu, 09 Feb 2012 14:27:06 +0000

Thanks mindinpanic. I have incorporated the comment in article. Appreciate your input.

Comment on Solving ORA-1031 while connecting as “/ as sysdba” : by mindinpanic

mindinpanic — Wed, 08 Feb 2012 16:03:30 +0000

Sorry for my bad english(((
And 6 step is that you must run sqlpus from bin directory of your oracle server

Comment on ORA-00132 while starting 11gR2 database by Claudiomiro Caetano

Claudiomiro Caetano — Wed, 08 Feb 2012 11:36:24 +0000

Simple and effective.
Thanks a lot, it solved my issue.

Comment on 11gR2 Silent Install errors with [SEVERE] – Invalid My Oracle Support credentials by Chris Bode

Chris Bode — Wed, 08 Feb 2012 03:12:36 +0000

one additional note, for this to work you have to remove your login info from the response file otherwise it still generates the error

Comment on Automatic Storage Management (ASM) FAQ by Saurabh Sood

Saurabh Sood — Mon, 30 Jan 2012 03:07:56 +0000

Hi Pawan,

We cannot force the writes to a specific disk. At least I am not aware of any such thing.
Oracle will write the primary-copy to any disk in a normal redundancy environment.
The default behavior is to read from the primary-copy, which can be alterted by the parameter that you have mentioned.
If we assume that all the data is written simultaneously to one disk, there are chances of performance degradation as the same disk controller will be active at one time to do I/Os.

- Saurabh Sood

Comment on Automatic Storage Management (ASM) FAQ by Amit

Amit — Sun, 29 Jan 2012 13:06:09 +0000

hi Pawan,

ASM_PREFERRED_READ_FAILURE_GROUPS is mainly used for RAC instances and that too stretch clusters i.e when RAC nodes are not sitting in same cluster. On single instance it doesn’t make any sense. Refer to oracle doc to read more about this

http://docs.oracle.com/cd/E11882_01/rac.112/e16795/storage.htm#RACAD820

Cheers
Amit

Comment on Automatic Storage Management (ASM) FAQ by PAWAN

PAWAN — Sun, 29 Jan 2012 11:11:55 +0000

HI,
i am newbie….

please guide me!

My manager asked me to configure ASM in 11g with single instance database!
with Normal redundancy with two disks as one disgroup(mirror)
he asked me two copies of data wil be there in two disks respectively…
he wants to write data to one disk and read data from one disk and he suggested me that…. using preferred Mirror Read 11g we can achieve this!

guide me…is there any document for this….

please ……..

Comment on Allocation Unit and Extents In ASM by PAWAN

PAWAN — Sun, 29 Jan 2012 10:57:26 +0000

HI,
i am newbie….

please guide me!

guide me…is there any document for this….

please ……..

Comment on Optimizer Choosing Nested-Loop Joins Instead of Hash-Joins by Saurabh Sood

Saurabh Sood — Sat, 21 Jan 2012 03:10:43 +0000

@Ganesh: The global stats were up-to-date for both the databases, though I did not check the col stats.

But the automated gather_stats_job ran next day as its schedule and after that the optimizer picked the correct plan..

So it was still unknown why the optimizer changed its behavior suddenly???

Comment on Optimizer Choosing Nested-Loop Joins Instead of Hash-Joins by Ganesh

Ganesh — Fri, 20 Jan 2012 04:47:40 +0000

Verify DBA_TAB_COL_STATISTICS in both database for those tables to get information on histograms.

select owner,job_name,schedule_name,enabled,state,last_start_date from DBA_SCHEDULER_JOBS

Comment on Optimizer Choosing Nested-Loop Joins Instead of Hash-Joins by Ganesh

Ganesh — Fri, 20 Jan 2012 03:37:41 +0000

Hope you have checked the global stats on those tables

Comment on 11g: Multiple failed login attempt can block New Application connections by Amit

Amit — Fri, 20 Jan 2012 03:30:24 +0000

Thanks Suvv and Anand for your comments…

Comment on Optimizer Choosing Nested-Loop Joins Instead of Hash-Joins by mdinh

mdinh — Fri, 20 Jan 2012 00:07:23 +0000

I am curious if you find anything. Having almost identical issues, CBO chose MJ vs HJ.

Comment on 11g: Multiple failed login attempt can block New Application connections by Anand

Anand — Thu, 19 Jan 2012 12:04:26 +0000

Nice one.Thanks for sharing

Regards,
Anand

Comment on 11g: Multiple failed login attempt can block New Application connections by Suvv

Suvv — Thu, 19 Jan 2012 11:15:46 +0000

Interesting ! Good article Amit !

Comment on Optimizer Choosing Nested-Loop Joins Instead of Hash-Joins by Saurabh Sood

Saurabh Sood — Thu, 19 Jan 2012 08:46:23 +0000

Thanks Yasser,

But the pga usage does not impact the hash joins, if the hash table is not able to fit in the memory, optimizer will break it into partitions and move the partitions into disk.
Conceptually, it should not cause change in optimizer behavior.

Regards,
Saurabh Sood

Comment on Optimizer Choosing Nested-Loop Joins Instead of Hash-Joins by Yasser

Yasser — Thu, 19 Jan 2012 04:34:23 +0000

Have a look on PGA usage, but not sure about direct impact on Join methods because of PGA usage.

Comment on Silent Install :OUI-10133:Invalid staging area Error by Avi

Avi — Wed, 18 Jan 2012 16:06:40 +0000

In windows installation it should be
FROM_LOCATION=”.\Stage\Products.xml”
right?

Comment on Silent Install :OUI-10133:Invalid staging area Error by Avi

Avi — Wed, 18 Jan 2012 16:05:10 +0000

If I perform the installation on windows it’s suppose to be:
FROM_LOCATION=”.\Stage\Products.xml”
right?

Comment on CRS-4640 Error on Starting 11gR2 clusterware by Zaman

Zaman — Tue, 17 Jan 2012 07:21:42 +0000

Great sharing of this experience……