Oracle Scratchpad

November 23, 2006

Statspack level 6

Filed under: Execution plans,Infrastructure,Statspack,Troubleshooting — Jonathan Lewis @ 7:59 pm BST Nov 23,2006

[Further Reading on Statspack]

While teaching a session on explain plan and associated technology today, I mentioned the sprepsql.sql script that can be used to report execution plans. At the end of the session one of the attendees asked me if I was aware of a bug with v$sql_plan that could cause the statspack snapshot call to hang the database on a library cache lock until you killed the process.

In fact I was aware of it, but had completely forgotten about it. So at the end of the day I did a quick search on Metalink to see if I could find a reference. It looks like bug 3778541, opened on 20th July 2004, last updated 20th July 2006 (with predicted fix in version 9.2.0.99 – so that looks like a long lifetime for 9.2 ;-)).  However this bug is, in fact, reported as fixed in the patch list for 9.2.0.7.

[Further Reading on Statspack]

November 15, 2006

dbms_xplan pt.2

Filed under: dbms_xplan,Execution plans,Infrastructure,Statspack,Troubleshooting — Jonathan Lewis @ 8:22 am BST Nov 15,2006

[More on dbms_xplan.display_cursor()]

A comment on my previous posting about dbms_xplan pointed out that in 10g you also get the function dbms_xplan.display_awr that allows you to report historical execution plans from the AWR (automatic workload repository).

This is true, and there is yet another function dbms_xplan.display_sqlset which allows you to report execution plans from SQL Tuning Sets if you have been using the Automatic SQL Tuning Tools. But to use these functions you do need to purchase the Tuning Pack licence and the Diagnostic Pack licence.

(more…)

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