Comments on: Advanced Oracle Troubleshooting Guide, Part 6: Understanding Oracle execution plans with os_explain

By: Tanel Poder

Tanel Poder — Sun, 24 Apr 2011 12:00:57 +0000

@Deba

Get them from the zip file for now:

http://blog.tanelpoder.com/2011/04/15/new-scripts-tools-and-broken-links/

By: Deba

Deba — Fri, 22 Apr 2011 14:21:44 +0000

Following scripts/documents are missing

1) http://www.tanelpoder.com/files/samples/os_explain_plan.txt
2) http://www.tanelpoder.com/files/scripts/os_explain

By: sriram Sanka

sriram Sanka — Fri, 22 Apr 2011 11:17:15 +0000

Sorry I have n`t read this.!
“Most of my scripts are present in the tpt_public.zip …”

Thanks for the update.

Sriram

By: sriram Sanka

sriram Sanka — Fri, 22 Apr 2011 11:14:47 +0000

Hi tanel !
This was nice & neat.But the scripts pages “http://www.tanelpoder.com/files/scripts/os_explain” and the other pages are giving 404 errror.
So could you please fix it !

Regards
Sriram

By: Tanel Poder

Tanel Poder — Thu, 14 Apr 2011 14:18:11 +0000

@Tanel Poder Most of my scripts are present in the tpt_public.zip ...

By: Tanel Poder

Tanel Poder — Thu, 14 Apr 2011 14:17:49 +0000

@KG Yeah I'll fix this soon....

By: KG

KG — Thu, 14 Apr 2011 06:47:59 +0000

Hi Tanel
None of the scripts links on the blog work

By: Ivan

Ivan — Fri, 09 Apr 2010 12:35:30 +0000

@Tanel Poder
But pdksh is more “compatible” than the real “ksh”. pdksh emulates the old ksh88 while ksh in RHEL5 is the newest ksh93. See:
https://bugzilla.redhat.com/show_bug.cgi?id=431448

By: Tanel Poder

Tanel Poder — Fri, 04 Sep 2009 10:54:36 +0000

Haris, if the output doesn’t make sense on HP-UX then please send a sample pstack output, maybe the columns are ordered there differently than on linux and solaris.

By: Tanel Poder

Tanel Poder — Fri, 04 Sep 2009 10:53:54 +0000

Ravi,

Truss does a different job, with pstack I took the sampling approach. I sample 10-100 times and then profile which stacks I see the most, to see where most time is spent.

With truss or DTrace approach also some post-processing would need to be done if you want to know what plan operation takes most time. I have done this in DTrace..

Haris,

Please download the script again, or just change the MAX_ARRAY=4095 to MAX_ARRAY=1023 in it, I suspect your shell can’t handle larger arrays (also on RHEL 4 and before there seems to be such problem)