Clik here to view.
Daylight Saving Time Causes Performance Issues!
Since I’m starting employment with Pythian on Monday, this is the last technical post that is exclusive to this blog. Future technical tips, discoveries and stories will appear on the Pythian blog, and...
View ArticleClik here to view.
How to find SPM baseline by sql_id
When you start working with SQL Plan baselines, one of the annoying things that you might find is that the main “baseline” dictionary view dba_sql_plan_baselines does not have sql_id column. SQL>...
View ArticleClik here to view.
How to add a hint to ORACLE query without touching its text
If you’ve been a DBA long enough, you’ve probably seen multiple cases where certain SQL queries just refuse to cooperate. I.e. you KNOW that the query is supposed to use index IDX1, but ORACLE...
View ArticleClik here to view.
Histograms are not what I assumed
One of the themes I'll keep coming back to is how things are often not how you have assumed they are, and how there are always opportunities to learn something new about Oracle. I am quite familiar...
View ArticleClik here to view.
Histograms are not what I assumed
One of the themes I'll keep coming back to is how things are often not how you have assumed they are, and how there are always opportunities to learn something new about Oracle. I am quite familiar...
View ArticleClik here to view.
UKOUG 2012 – Day 2
A deep dive into Dataguard is a tough way to start the day off but Emre Baransel handled it well. I jotted down about 6 or 7 takeaways for later investigation. Much of the talk was about tuning the...
View ArticleClik here to view.
Oracle Open World 2013 Call For Papers!
Believe it or not, it's time once again to start thinking about Oracle OpenWorld! The Oracle OpenWorld 2013 call for papers opens March 13th. Oracle customers and partners are encouraged to submit...
View ArticleClik here to view.
ORs, IN lists and LNNVL
I’ve previously written about manually rewriting an OR condition into a UNION ALL using LNNVL. This is a description of a performance issue observed in the real world from the optimizer coming up with...
View ArticleClik here to view.
Limiting the Degree of Parallelism via Resource Manager and a gotcha
This might be something very obvious for the reader but I had an interesting revelation recently when implementing parallel_degree_limit_p1 in a resource consumer group. My aim was to prevent users...
View ArticleClik here to view.
Upcoming event: Kscope 13
Kscope 13, is the annual conference of the Oracle Development Tools User Group, taking place June 23 - June 27, in New Orleans. This is a great conference for Oracle developers and architects,...
View ArticleClik here to view.
Oracle Database 12c is here!
Oracle Database 12c was officially release today and is now available for download. Along with the software release comes a whole new set of collateral that explains in detail all of the new features...
View Article12c New Optimizer Features
Besides the officially available information about new optimizer features in 12c it is always a good idea to have a look at the internal optimizer parameters that show what features are enabled when...
View Article
