Comments for Tanel Poder's blog: IT & Mobile for Geeks and Pros

Comment on Detect chained and migrated rows in Oracle – Part 1 by Marek

Marek — Wed, 08 Feb 2012 08:03:50 +0000

Hi Tanel,
thanks for this excellent work. The query I made based on your article for detecting row migration.
Kind regards.

SELECT
NVL(VSE.USERNAME,’BACKGROUND’) USERNAME,
VSE.SID,
VSE.PROGRAM,
TFCR.VALUE AS “TABLE FETCH CONTINUED ROW”,
TFBR.VALUE AS “TABLE FETCH BY ROWID”,
ROUND(((1-(TFBR.VALUE-TFCR.VALUE)/TFBR.VALUE))*100,2) AS RATIO
FROM
(
SELECT
VSE.SID, VSE.VALUE
FROM
V$SESSTAT VSE
INNER JOIN V$STATNAME VSN
ON VSE.STATISTIC#=VSN.STATISTIC#
WHERE
UPPER(VSN.NAME)=’TABLE FETCH CONTINUED ROW’
) TFCR
INNER JOIN
(
SELECT
VSE.SID, VSE.VALUE
FROM
V$SESSTAT VSE
INNER JOIN V$STATNAME VSN
ON VSE.STATISTIC#=VSN.STATISTIC#
WHERE
UPPER(VSN.NAME)=’TABLE FETCH BY ROWID’
) TFBR
ON TFCR.SID=TFBR.SID
INNER JOIN
V$SESSION VSE
ON TFCR.SID=VSE.SID
WHERE
TFCR.VALUE>0
ORDER BY VSE.USERNAME

Comment on Advanced Oracle Troubleshooting Guide, Part 2: No magic is needed, systematic approach will do by Roman

Roman — Tue, 07 Feb 2012 21:49:25 +0000

Please update link to sw.sql it is brocken on all pages

Comment on My UKOUG 2011 appearances by Syed

Syed — Mon, 06 Feb 2012 10:55:22 +0000

Hi Tanel,
That would be great if we could get the “Tanel_Poder_Troubleshooting_Complex_Performance.pdf”.
Regards
Syed

Comment on What the heck is the SQL Execution ID – SQL_EXEC_ID? by Tanel Poder

Tanel Poder — Sat, 04 Feb 2012 05:24:49 +0000

Oh, compared to the other Oracle documentation link I posted above it is better – but still not enough :)

Comment on Scripts for showing execution plans via plain SQL and also in Oracle 9i by Oracle Query Optimizer Vanishing Acts « Charles Hooper's Oracle Notes

Oracle Query Optimizer Vanishing Acts « Charles Hooper's Oracle Notes — Sat, 04 Feb 2012 03:51:58 +0000

[...] How about testing the real thing… actually executing the SQL statements in the test case script on an older version of Oracle Database – will you receive the same execution plans? I tested Oracle Database 10.2.0.5 and obtained the same execution plans as I saw with 11.2.0.2. Anyone with access to Oracle Database 10.1, 9.2, 9.0.1, or 8.1.7 that is able to test the above script? The DBMS_XPLAN.DISPLAY_CURSOR function is not available in Oracle Database versions prior to 10.1, so you will need to be creative to display the execution plan (AUTOTRACE may show the wrong execution plan - you might experiment with a solution offered by Tanel Poder for Oracle Database 9i). [...]

Comment on What the heck is the SQL Execution ID – SQL_EXEC_ID? by Tanel Poder

Tanel Poder — Thu, 02 Feb 2012 22:20:09 +0000

Srivenu, I don’t agree. It says what this exec ID is supposed to be and stops there. That’s not enough, especially for my blog here! Thus this blog entry.

Comment on What the heck is the SQL Execution ID – SQL_EXEC_ID? by srivenu kadiyala

srivenu kadiyala — Thu, 02 Feb 2012 11:07:54 +0000

Tanel,
I think this definition is a little more explanatory.
http://docs.oracle.com/cd/E11882_01/server.112/e25513/dynviews_3052.htm

SQL_EXEC_ID – “Execution identifier. Together, the three columns SQL_ID, SQL_EXEC_START, and SQL_EXEC_ID represent the execution key. The execution key is used to uniquely identify one execution of the SQL statement.”

thanks

Comment on Sqlplus is my second home, Part 1: HTMLizing your sqlplus output by Jon

Jon — Thu, 02 Feb 2012 09:45:26 +0000

Hi,
I tried running the script, i got this error, “/bin/ksh: start: not found”.
OS info:

$ uname -a
SunOS crater 5.8 Generic_108528-29 sun4u sparc SUNW,Sun-Fire-280R

Please assist.

Thanks.

Comment on MOATS: The Mother of All Tuning Scripts! by Regis Biassala

Regis Biassala — Tue, 31 Jan 2012 16:06:50 +0000

Hi Tanel,

Thanks, good scripts and helpful.

Regis

Comment on cursor: pin S waits, sporadic CPU spikes and systematic troubleshooting by SCHED_NOAGE and latch contention « Oracle

SCHED_NOAGE and latch contention « Oracle — Mon, 30 Jan 2012 15:29:58 +0000

[...] quick search on the net revealed the blog entry from Tanel Poder “cursor: pin S waits, sporadic CPU spikes and systematic troubleshooting“. This matches exactly with the problem that this instance was [...]