Comments for Exploring Oracle

Comment on About me by s prakash

s prakash — Thu, 27 Aug 2009 10:46:50 +0000

Hi Mehraj,
Nice information.excellent job.

Regards
s . prakash

Comment on Materialized view with Unique Index by Mohammed Mehraj Hussain

Mohammed Mehraj Hussain — Thu, 06 Aug 2009 13:43:52 +0000

ORA-12008—SNAP$_ reads rows from the view MVIEW$_, which is a view on the master table (the master may be at a remote site). Any error in this path will cause this error at refresh time. For fast refreshes, the table .MLOG$_ is also referenced.

The problem is in your Query ,Plz Post the Complete script

Comment on Materialized view with Unique Index by Ashwini

Ashwini — Fri, 24 Jul 2009 20:04:11 +0000

Hi Mehraj,

We are getting a ORA-12008 error accompanied by ORA-01422 error when the materialized view first tries to refresh. Here’s the query and the error:

CREATE MATERIALIZED VIEW zzz
REFRESH START WITH ROUND(SYSDATE) + 13/24
NEXT NEXT_DAY(TRUNC(SYSDATE), ‘THURSDAY’) + 10/24
from xxx;

Error:
=====
ORA-12012: error on auto execute of job 258
ORA-12008: error in materialized view refresh path
ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at “SYS.DBMS_SNAPSHOT”, line 803
ORA-06512: at “SYS.DBMS_SNAPSHOT”, line 860
ORA-06512: at “SYS.DBMS_IREFRESH”, line 683
ORA-06512: at “SYS.DBMS_REFRESH”, line 195
ORA-06512: at line 1

Any idea as to why this error occurs?

Thanks much.

Comment on DBA best practices by mohammed ali

mohammed ali — Fri, 27 Mar 2009 17:41:53 +0000

good work brother meraj. May allah bless you.

Comment on About me by mhdmehraj

mhdmehraj — Fri, 20 Mar 2009 13:31:51 +0000

Thankz for your response , and sure i will contribute my level best .

Comment on About me by Kamran Agayev A.

Kamran Agayev A. — Fri, 20 Mar 2009 06:44:49 +0000

Hi Mohammad Mehraj
Nice to meet you. Good Blog. Waiting for new posts in your blog. I wish you every success in your Oracle career. See you, take care

Kamran Agayev A.
kamranagayev.wordpress.com

Comment on _kgl_large_heap_warning_threshold by mhdmehraj

mhdmehraj — Tue, 03 Feb 2009 06:34:44 +0000

thankz for ur comment… yes its 10201

Comment on _kgl_large_heap_warning_threshold by Aman....

Aman.... — Tue, 03 Feb 2009 05:01:07 +0000

Mehraj,
Its good to mention the database release number. This error warning is there in 10201. From 10202, this limit is already increased to 50meg which doesn’t let it come pretty often as in 10201.

Nonetheless, its always better to check with support before attempting to change any undocumented parameter.

Cheers
Aman….

Comment on Database upgradation 9i to 10g (Manual Method) by mhdmehraj

mhdmehraj — Wed, 21 Jan 2009 05:14:13 +0000

it will be in your 9i oracle_home

Comment on Database upgradation 9i to 10g (Manual Method) by FArouk Mirza

FArouk Mirza — Fri, 16 Jan 2009 20:24:45 +0000

i cannot seem to locate my u902000.sql. will it be in oracle 10g or oracle 9i

Comment on SCN TO Timestamp conversion and Vice Versa by sadasivam

sadasivam — Fri, 09 Jan 2009 09:29:39 +0000

its nice

Comment on About me by mhdmehraj

mhdmehraj — Fri, 09 Jan 2009 07:29:27 +0000

Dear Vivek,
To start with performance tuning i will suggest you to learn oracle documentation

http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/toc.htm

http://www.orafaq.com/wiki/Oracle_database_Performance_Tuning_FAQ
And the most important is you need to know about different types of wait events …
ANd learn more about Oracle Utilities …
eg: ADDM,AWR,Staspack,Explain plan ,tkprof, tuning advisors etc

Comment on About me by vivek

vivek — Thu, 08 Jan 2009 15:42:22 +0000

Hi Mehraj

I am new to performance tunnig please give some document to start