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Focusing Specifically On Oracle Indexes, Database Administration and Some Great Music
Updated: 6 days 46 min ago

AUSOUG “Oracle Master” Award

Thu, 11/22/2018 - 01:43
  I was very flattered and honoured to be named one of the first 4 “Oracle Masters” by the Australian Oracle User Group at the recent AUSOUG Connect 2018 conference in Melbourne. Thank you to all the AUSOUG members involved for this award. As always, it’s a pleasure to help fellow Oracle Database professionals in […]

Presenting at AUSOUG Connect 2018 Conference in Melbourne, 21 November 2018.

Sun, 11/18/2018 - 12:25
  After initially not being in a position to make it this year, I will now be presenting at the AUSOUG Connect 2018 Conference in Melbourne this coming Wednesday, 21 November 2018. My presentation will be: “12c Release 2 and 18c – New Indexing Related Features” Oracle Database 12.2 and 18.3 releases have introduced a number […]

Enable Index To Search For NULLs By Adding Constant to Index List. But Some Constants Better Than Others (Never Let Me Down)

Thu, 11/15/2018 - 00:29
By default, Oracle doesn’t index an entry if all columns within the index are NULL. However, (as I’ve blogged previously), it’s possible to index all possible NULL values by simply adding a constant value to the index column list. Importantly, the CBO knows when a column has all it’s NULL values indexed and can potentially […]

March 2019 – New Webinar Dates Announced for “Oracle Indexing Internals and Best Practices”

Wed, 11/14/2018 - 04:19
I’m very excited to announce two new Webinar events for my acclaimed “Oracle Indexing Internals and Best Practices” training event, running in March 2019 !! For details of all the extensive content covered in the webinars, please visit my Indexing Seminar page. The webinars will run for 4 hours each day, spanning a full week period (Monday […]

FIRST_ROWS_10 CBO Is Hopeless, It’s Using The Wrong Index !! (Weeping Wall)

Mon, 11/05/2018 - 11:45
There’s an organisation I had been dealing with on and off over the years who were having all sorts of issues with their Siebel System and who were totally convinced their performance issues were due directly to being forced to use the FIRST_ROWS_10 optimizer. I’ve attempted on a number of occasions to explain that their […]

“Hidden” Efficiencies of Non-Partitioned Indexes on Partitioned Tables Part IV” (Hallo Spaceboy)

Wed, 10/31/2018 - 03:17
In Part I, Part II and Part III we looked at some advantages of Global Indexes that may not be obvious to some. One of the advantages of a Local Index vs. Non-Partitioned Global Index is that a Local Index being a smaller index structures may have a reduced BLEVEL in comparison. This can save […]

“Hidden” Efficiencies of Non-Partitioned Indexes on Partitioned Tables Part III” (Ricochet)

Thu, 10/25/2018 - 01:15
In Part I and Part II of this series, we looked at how Global Indexes can effectively perform “Partition Pruning” when the partition keys are specified in SQL predicates, by only using those index entries that have a Data Object of interest stored within the index Rowids. In this piece, I’ll cover the key performance […]

“Hidden” Efficiencies of Non-Partitioned Indexes on Partitioned Tables Part II (Aladdin Sane)

Tue, 10/09/2018 - 06:16
In Part I of this series, I highlighted how a Non-Partitioned Global Index on a Partitioned Table is able to effectively perform “Partition Pruning” by reading only the associated index entries to access just the table blocks of interest from relevant table partitions when the table partitioned keys are specified in an SQL Predicate. Understanding […]

“Hidden” Efficiencies of Non-Partitioned Indexes on Partitioned Tables Part I (The Jean Genie)

Thu, 10/04/2018 - 08:00
When it comes to indexing a partitioned table, many automatically opt for Local Indexes, as it’s often assumed they’re simply easier to manage and more efficient than a corresponding Global Index. Having smaller index structures that are aligned to how the table is partitioned certainly has various advantages. The focus in this little series is on […]

New Zealand: “Oracle Indexing Internals and Best Practices” Seminars November 2018.

Thu, 08/23/2018 - 22:37
Good news for those of you in beautiful New Zealand. Due to popular demand, I’ll be returning to run some of my acclaimed “Oracle Indexing Internals and Best Practices” seminars in November 2018. The dates and events are: Wellington: 19-20 November 2018: Registration Here or Buy Directly Here Auckland: 21-22 November 2018: Registration Here or […]