Success is about Imagination

Every so often a DSS query that usually takes 10 minutes ends up taking over an hour.  (or one that takes an hour never seems to finish)...

Oracle OEM 12c introduces a new feature that enables the creation of Oracle database thin clones by leveraging file system snapshot...

Here are  the tuning metrics tables (SQL  stats are not in “metric” tables per say) (*DBA_HIST_…_HISTORY views are sort of confusing....

Here is a quick table comparison of  different types of metrics views The first line of the table is the classic wait event and statistic...

Primary/Unique Key: inserting a unique key when  someone else has already inserted that key but not committed Foreign Key: Inserting a...

db file sequential read db file scattered read log file parallel write direct path reads direct path reads temp Of course it would be...

Anyone who has been around Oracle performance over the years knows the grief that hard parsing SQL queries can cause on highly concurrent...

Does the query always execute in the same amount of  time? If some executions are slower, what is the slowest execution time? When did...

Image from Bertrand Drouvot UPDATE: thanks to a discussion in the comments it’s come to my attention that there should be some more...

Here is my list and everything on this list is excellent. I’m sure I missed a few good ones, but maybe people can add them in the...

Oracle has a crazy mix of units of time in various v$ views seconds centi-seconds milliseconds microseconds Some are straight forward...

Another problematic wait event in Oracle is “SQL*Net break/reset to client”. This wait event typically happens when there is something...

One of my pet peeves on Oracle is the inability to find out what SQL took out a lock that another user is waiting. It’s easy to find the...