RE: Oracle advanced tuning course

From: David Sharples <dsharples_at_cerebrussolutions.com>
Date: Tue, 27 Jul 2004 09:12:16 +0100
Message-ID: <EA29A3FCC723674293FD6286D3F0513E82B0E4@louis.cerebrus.com>

With regards to copyright material, I'm pretty sure you have to get the permission of the copyright owner before you can publish or copy any of their work, so you might get stuck with some legal issues.

For instance you have quoted some parts from askTom, that is copyright Oracle Corporation and they can be quite strict on copyright laws

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Juan Carlos Reyes Pacheco
Sent: 27 July 2004 00:43
To: oracle-l_at_freelists.org
Subject: Oracle advanced tuning course=20

Hi list
as you know I'm not an expert, but I think after all this 7 years, and suffering I had in all hte database we installed, I can give a course to teach a new dba tecniques to get an advanced level. I think this is sometimes only to point to the fact some feature exists, I tried to test any thing before giving an opinion, and investigated about.
For exapmle I couldn't get oracle use histograms I'll do further investigations.

I have to add several points, but I'll do when I get time, bucause it tookme
a lot of time to write it.

I respect other words (something not common or I can't find in documentation
using other words) , for examle from this lis I copy cary's comment about
RAC, I could change cary's words and write it as if I would had said, but I=20
think this is unethic and stupid, because the day someone askme about it will be obvious that weren't my words. The day I have enough rac expertience
to give my opinion I'll replace it.
I don't know too much about copyright any correction will be welcome, I suppose to put the link is enough.

This paper will be free available on my site

This is almost the final draft,is far miles away from my previous paper, this is at least all in english.

Any specific critic is welcome.

www.geocities.com/juancarlosreyesp/OracleAdvancedTuningCourse.pdf

sorry, my daily bandwidth is short.

Juan Carlos Reyes Pacheco
OCP
-------Original Message-------
=20

From: oracle-l_at_freelists.org
Date: 07/26/04 19:10:53
To: oracle-l_at_freelists.org
Subject: Re: 9.2 V$ views
=20

> (like even analyzing DD in 9.2, etc.)
>
> Can't that lead us to other problems?

=20

Yep, it can ;)
But in 9.2 it's supported and in 10g it's default anyway...
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Btw, the dba_extents performance problem you mentioned earlier probably comes from the fact that in LMT configuration you can get detailed extent
information only from the segment header itself, this means at least one consistent get per segment which you're querying. Given that lots of segment
headers aren't in buffer cache, a count(*) on dba_extents may cause thousands of physical IO's, recursive calls and latching...
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SQL> set autot trace stat
SQL> select count(*) from dba_extents;
=20

1 row selected.
=20
=20

Statistics

41228 recursive calls
1 db block gets
20799 consistent gets
3389 physical reads
0 redo size
380 bytes sent via SQL*Net to client
511 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
=20

So, dba_extents is a quite dangerous view to query in LMT environment.
=20

Tanel.
=20
=20

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Received on Tue Jul 27 2004 - 03:07:47 CDT