Hi Tanel,
I have been following your blog and you must have read some of my comments too over here as well as over the OTN forums too with the same sign. I am always interested in the internals and P/T stuff. I have started doing it more seriously now from some time. I want your guidance and support to learn all this. How do you research the topics? As you mentioned that you didn’t have the formal IT training so its just amazing what you are doing. I shall appreciate if you can help/guide me to go ahead with the research path. A good mentor is must as there must not be a wrong learning. And I believe, one can’t do P/T if he doesn’t know how oracle works. So can you please help me in it?

In wait for the reply.
Regards
Aman….

I was in your recent class of Advanced troubleshooting in DC. It was really great to be in the class, learned a lot and hopefully make practical use of the systematic troubleshooting approach.
I am trying to download your latest set of scripts, where can I find them on your web site?

Hi Tanel,

Have been using your tools alot recently… For some reason when I use usql I get a disconnect:

SQL*Plus: Release 10.2.0.3.0 – Production on Wed Dec 9 12:20:35 2009

Copyright (c) 1982, 2006, Oracle. All Rights Reserved.

Enter user-name: / as sysdba

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 – 64bit Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options

USERNAME INST_NAME HOST_NAME SID SERIAL# VERSION STARTED SPID CPID SADDR PADDR
——————– ———— ————————- —– ——– ———- ——– ————— ————— —————- —————-
SYS UK1 lscxw01p1.ukdatapoint.com 198 4875 10.2.0.3.0 20091208 6222 6154 000000021F578F08 000000021F40E918

SQL> select * from v$version;

BANNER
—————————————————————-
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 – 64bi
PL/SQL Release 10.2.0.3.0 – Production
CORE 10.2.0.3.0 Production
TNS for Linux: Version 10.2.0.3.0 – Production
NLSRTL Version 10.2.0.3.0 – Production

SQL> !uname -a
Linux lscxw01p1.ukdatapoint.com 2.6.9-67.0.4.ELsmp #1 SMP Fri Jan 18 05:00:00 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

SQL> @usql 243

HASH_VALUE CH# PLAN_HASH SQL_TEXT
———- —– ———- ————————————————————————————————————–
(XMLAGG889115592 /* Formatted on 2009/09/04 12:11 (Formatter Plus v4.8.7) */
(“venue”,ELEMENT
(ea.venue_id AS “venue_id”,
FROM mv_attribute_value
AND activity_id = 301
),te_name = ‘venue_name’) AS “venue_name”
(SELECT XMLAGG
(“title”,
xmlattributes

CH# PARENT_HANDLE OBJECT_HANDLE PARSES H_PARSES EXECUTIONS FETCHES ROWS_PROCESSED LIOS PIOS SORTS CPU_MS ELA_MS USERS_EXECUTING
—– —————- —————- ———- ———- ———- ———- ————– ———- ———- ———- ———- ———- —————
0 0000000206CEF2A0 0000000206AD0200 1 1 5 4 4 32488739 16856 68775 867697.956 1240898.07 1

SQL hash value: 586338503 Cursor address: 0000000206CEF2A0
| Statement first parsed at: 2009-12-09/11:19:26 | 3690 seconds ago

select –+ ordered use_nl(p ps)
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel

ERROR:
ORA-03114: not connected to ORACLE

Have you seen this before?

All other sqls; snapper, sw etc work fine.

Any thoughts,

Regards,

Simon

Good morning Tanel,

Have emailed you @ tanel@tanelpoder.com

Cheers,

Simon

Hi Tanel,

I was playing with the “*ss.awk” systemstate decoder script from LTOM, but frankly I would prefer to get first more knowledge about this kind of dumps. I’ve read in some section here that you had previously taught in a seminar ways to work with them, and I wonder if this particular seminar is still available online?

Best regards, and great thanks for your site and effort!

Hello, I have been following your blog has some time and I believe that it contributes greatly to professional with performance issue in Oracle.

I’ve been developing for some time a tool named Mandela to diagnose performance problems. It need not be installed or create any object in the database analyzed. It only needs read access to the tables of STATSPACK or AWR.

The site is still under development, but if you want can download the Mandela and follow the launch of the latest versions.

What makes Mandela nice? Well, he can show into timeline all statistical system, redo log files switches, statistics I/O (tablespace, and datafile filesystem) and much more…

But what it does well done is to decompose the wait events (two clicks, three at most) and allow drilldown for the top sql by metrics (buffer gets, diskreads, cpu time, elapsed time, etc.) and now for the wait event. That’s right … from a chart of wait events you right click mouse and see the statements SQL that waited for “db file sequential read” or “CPU”, for example.

If you’re interested (and available) to see how Mandela can help you gain productivity, access http://www.trevis.com.br/projetos/mandela/download

If you want to chat or ask questions about the Mandela my contacts is as follows:

[] s,
Rafael Trevisan
http://www.trevis.com.br
EMail / MSN / GTalk: rafael@trevis.com.br

Hey Tanel, can you share some of the books that you refer or that could be helpful to Oracle DBAs in general. Also some specific books on Unix etc. I would be really grateful for that.