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Tables and Their Indexes Should be Located on Different Disks – What is Wrong with this Quote?

February 17, 2012 As I mentioned in a previous blog article, I placed an order for the book “Oracle Database 11gR2 Performance Tuning Cookbook“, mostly because I was curious how the book would compare with the “Oracle Database 11g Performance Tuning Recipes” book (my review of that book was a total of about 35 typewritten pages in [...]

SESSIONS Derived Value Formula – Doc Bug Explains

February 8, 2012 Default parameter values are great, as long as it is possible to predict the default values, and the defaults are appropriate for the environment in which the defaults are present.  It is sometimes a challenge to remember all of the rules, and exceptions to those rules, that determine the defaults. I had a [...]

The Transforming Face of the Oracle Support Site

December 23, 2011 A day or two ago I saw an announcement that the HTML (non-Flash) version of the Oracle Support site was to be phased out in January 2012.  It seems like the last time I tried to use that site, the search functionality did not quite work for Oracle Database products; I gave up on [...]

What Could Go Wrong? Testing the DB_FILE_MULTIBLOCK_READ_COUNT Parameter

October 14, 2011 (Modified October 15, 2011) When reading various Oracle Database books, I often perform mental exercises related to the book’s contents, asking “what could go wrong?”   That is probably why some of my book reviews have extended to record setting lengths… who knew that Amazon imposed a limit on book review lengths… I [...]

Having Fun with ORA-00600 (qkebCreateConstantOpn1) – What is the Cause of this Error?

September 28, 2011 A friend brought an interesting Oracle Database problem to my attention. He is in the process of upgrading to a new Oracle Database server (and Oracle Database version) and a new version of an ERP package. He has experienced an ORA-00600 error with both patch 6 and patch 9 for [...]

SESSION_CACHED_CURSORS – Possibly Interesting Details

July 21, 2011 Have you ever wondered about the V$OPEN_CURSOR view, the SESSION_CACHED_CURSORS parameter, and the two session-level statistics “session cursor cache count” and “session cursor cache hits”?  I did after reading from two different sources that stated essentially that a larger shared pool would be required when the value for the SESSION_CACHED_CURSORS parameter is [...]

V$SESSION’s ROW_WAIT_OBJ# Column Shows the DATA_OBJECT_ID – Verify the Documentation Challenge

June 7, 2011 While reading through the alpha copy of a performance tuning book, I noticed a set of SQL statements that were identical to those found in the Oracle Database 11.2 Performance Tuning Guide.  The set of SQL statements from the Performance Tuning Guide follow: Causes To determine the possible causes, first query [...]

Unique Index Result Error with Ref Cursor on Oracle 11g but Not on 10g

June 6, 2011 You might expect to see some differences when upgrading from one release version of Oracle Database to another release version (edit June 6, 2011: see this article for expected changes when upgrading from 10g to 11g).  For instance, you might find that Oracle Database deadlock when Oracle Database and below [...]

Insert Error on Oracle 11g but Not on 10g

June 2, 2011 The most popular article on this blog includes a script that demonstrates generating a deadlock on Oracle Database 11g R1 and R2 when the exact same script on Oracle Database 10g R2 does not trigger a deadlock.  I came across another interesting change between Oracle Database and (the change also [...]

Reading Material On Order 2

May 29, 2011 A year ago I wrote an article that had a couple of topics, one of which described three books that I put on order - ordered with the intention of writing reviews for all three books.  Two of the books arrived in a timely fashion, while the third book has yet to arrive despite being ordered [...]