Comments for Oracle DBA - Tips and Techniques

Comment on Oracle Wait Events causes and resolutions by Gavin Soorma

Gavin Soorma — Thu, 01 Dec 2011 00:35:35 +0000

Hi – could you please try and access the document and let me know if you are still having issues – thanks

Comment on Oracle Wait Events causes and resolutions by Gavin Soorma

Gavin Soorma — Thu, 01 Dec 2011 00:33:37 +0000

Hi Manish – could you please try again and let me know if you are still facing any difficulties. Thanks

Comment on Oracle Wait Events causes and resolutions by manish

manish — Tue, 29 Nov 2011 04:22:07 +0000

Hi
I am not able to download the file.
Could you please send the document to my mail id “kmrmanish23@gmail.com”

thanks,
Manish

Comment on Oracle Wait Events causes and resolutions by Sreekanth

Sreekanth — Thu, 17 Nov 2011 21:14:57 +0000

Hi, i too not able to download the current document and still the document word 2003 is not uploaded. could you please send the document to the sree_k4u@yahoo.co.in if you couldn’t upload the document.

Comment on Oracle Wait Events causes and resolutions by Gavin Soorma

Gavin Soorma — Wed, 16 Nov 2011 03:22:59 +0000

Hi – I think it is a docx type Word document – I will upload a Word 2003 document today – thanks for pointing it out

Comment on 11g Grid Control Installation – tips and solutions by daniel

daniel — Fri, 26 Aug 2011 23:01:54 +0000

no need to hack emctl script for 10.2.0.4 listener issues with the 11g agent, there is a patch for it; i’ve applied it and it works as expected.

Patch 9828187: GC 11G: DATABASE 10.2.0.4 LISTENER SHOWS DOWN WHEN IT IS UP

Oracle Management Agent 11g Release 1 (11.1.0.1.0)
Patch for Bug# 9828187
Released: Apr 13, 2011

regards,
daniel

Comment on Useful GoldenGate commands – SHELL, OBEY, HELP, HISTORY,VERSIONS by Gavin Soorma

Gavin Soorma — Fri, 26 Aug 2011 03:27:40 +0000

Try this – have created a simple shell script – you can build on this

/export/home/oracle/gg/ggsci < output.txt
info all
EOF

Comment on Useful GoldenGate commands – SHELL, OBEY, HELP, HISTORY,VERSIONS by BC

BC — Tue, 23 Aug 2011 13:28:42 +0000

But how you output “INFO ALL” to a .txt file?

Comment on Oracle GoldenGate – how to connect to a particular database if there are multiple databases on the source or target server by E.Hatt-Swank

E.Hatt-Swank — Wed, 10 Aug 2011 12:50:53 +0000

I just wanted to say thank you so much for your GoldenGate tutorials. I’m working on setting up a GoldenGate environment for the first time, and while the official documentation has lots of detailed information, I have found it to be poorly organized and inconsistent. I’ve been relying heavily on your tutorials for clear step-by-step instructions. And just now, I needed an answer to this very question of multiple databases replicating on the same system: your site was the first place I looked. Thank you!

Comment on Using DBMS_ADVANCED_REWRITE with an HINT to change the execution plan by Vishal Desai

Vishal Desai — Wed, 29 Jun 2011 14:34:15 +0000

Excellent stuff.

When using bind variable it throws error:
ORA-30353: expression not supported for query rewrite

Workaround and limitation:

VDESAI@db > create view myobjects1 as select * from myobjects;

View created.

VDESAI@db >
VDESAI@db > begin
2 sys.dbms_advanced_rewrite.declare_rewrite_equivalence(
3 name => ‘Use_Myobjects_Index’,
4 source_stmt =>’select object_name,object_type from myobjects’,
5 destination_stmt => ‘select /*+ INDEX (myobjects1 myobjects_ind) */ object_name ,object_type from myobjects1′ ,
6 validate => false,
7 rewrite_mode => ‘GENERAL’);
8 end;
9 /

PL/SQL procedure successfully completed.

VDESAI@db > var b varchar2(100);
VDESAI@db > exec :b:=’GAVIN’;

PL/SQL procedure successfully completed.

VDESAI@db > explain plan for select object_name,object_type from myobjects where owner=:b;

Explained.

VDESAI@db > select * from table (dbms_xplan.display);

PLAN_TABLE_OUTPUT
———————————————————————————————————————————

Plan hash value: 2745750972

———————————————————————————————
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
———————————————————————————————
| 0 | SELECT STATEMENT | | 694 | 65236 | 42 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| MYOBJECTS | 694 | 65236 | 42 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | MYOBJECTS_IND | 278 | | 40 (0)| 00:00:01 |
———————————————————————————————

Predicate Information (identified by operation id):

PLAN_TABLE_OUTPUT
———————————————————————————————————————————

—————————————————

2 – access(“OWNER”=:B)

Note
—–
– dynamic sampling used for this statement (level=2)

18 rows selected.

Now it does not recognize that data is skewed and uses same INDEX RANGE SCAN operation for all bind values.