Richard Foote

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Focusing Specifically On Oracle Indexes, Database Administration and Some Great Music
Updated: 7 hours 50 min ago

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

Tue, 2018-11-13 22:19
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 […]
Categories: DBA Blogs

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

Mon, 2018-11-05 05:45
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 […]
Categories: DBA Blogs

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

Tue, 2018-10-30 22:17
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 […]
Categories: DBA Blogs

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

Wed, 2018-10-24 20:15
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 […]
Categories: DBA Blogs

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

Tue, 2018-10-09 01:16
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 […]
Categories: DBA Blogs

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

Thu, 2018-10-04 03:00
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 […]
Categories: DBA Blogs

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

Thu, 2018-08-23 17:37
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 […]
Categories: DBA Blogs

“Let’s Talk Database” coming to Wellington, Auckland, Brisbane and Perth in September.

Thu, 2018-08-16 19:08
Due to popular demand, I’ve been asked by Oracle to again run some more “Let’s Talk Database” events in September. Dates and venues are as follows: Monday, 2 September – Wellington (Wellington Oracle Office): Registration Link. Tuesday, 3 September – Auckland (Auckland Oracle Office): Registration Link. Wednesday, 12 September – Brisbane (Brisbane Oracle Office): Registration Link. Thursday, 13 September – Perth (Perth Oracle Office): Registration Link. […]
Categories: DBA Blogs

FAQ: Webinars for “Oracle Indexing Internals and Best Practices”

Mon, 2018-07-30 05:01
I’ve been somewhat inundated with questions regarding the “Oracle Indexing Internals and Best Practices” webinar series I’ll be running in October and November since I announced both webinar series last week. So I’ve compiled the following list of frequently asked questions which I’m hoping will address most of those asked. If you have any additional […]
Categories: DBA Blogs

Announcement: Webinars for “Oracle Indexing Internals and Best Practices” Now Confirmed !!

Mon, 2018-07-23 03:28
Exciting News !! I can now confirm the dates for my first webinars of my fully updated and highly acclaimed “Oracle Indexing Internals and Best Practice” seminar. 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 […]
Categories: DBA Blogs

Announcement: Venue Confirmed For Upcoming Brussels “Oracle Indexing Internals and Best Practices” Seminar

Wed, 2018-07-18 02:55
I can finally confirm the venue for my upcoming “Oracle Indexing Internals and Best Practices” seminar in beautiful Brussels, Belgium running on 27-28 September 2018. The venue will be the Regus Brussels City Centre Training Rooms Facility, Avenue Louise / Louizalaan 65, Stephanie Square, 1050, Brussels. Note: This will be the last public seminar I’ll run […]
Categories: DBA Blogs

Rebuilding Indexes: Danger With Clustering Factor Calculation (Chilly Down)

Tue, 2018-07-17 01:33
Let me start by saying if you don’t already following Jonathan Lewis’s excellent Oracle blog, do yourself a favour. In a recent article, Jonathan highlighted a danger with rebuilding indexes (or indeed creating an index) when used in relation to collecting index statistics with the TABLE_CACHED_BLOCKS preference. I’ve discussed the importance of the TABLE_CACHED_BLOCKS statistics […]
Categories: DBA Blogs

Index Column Order – Impact On Index Branch Blocks Part II (The Weeping Song)

Wed, 2018-07-04 21:25
In Part I, I discussed how the order of columns in an index makes no real difference to the effectiveness of the index if all columns are referenced via equality predicates. If the leading column has a high number of distinct columns, it might result in less necessary data within index branches as less data […]
Categories: DBA Blogs

Announcement: New Europe Seminar in Brussels, Belgium 27-28 September 2018

Tue, 2018-07-03 01:49
Due to popular demand, I’ll be running another of my acclaimed seminars in Europe later in the year, this time in Brussels, Belgium on 27-28 September 2018. This is a must attend seminar of benefit to not only DBAs, but also to Developers, Solution Architects and anyone else interested in designing, developing or maintaining high […]
Categories: DBA Blogs

Index Column Order – Impact On Index Branch Blocks Part I (Day-In Day-Out)

Mon, 2018-06-04 07:16
I recently replied on Twitter to some comments regarding an excellent blog post by Franck Pachot – Covering indexes in Oracle, and branch size, where I disagreed somewhat with one of the conclusions stated in the post: “ensure that selective columns appear as early as possible (without compromising the index access efficiency of course) in order to […]
Categories: DBA Blogs

Announcing July/August Australian Dates: “Oracle Indexing Internals and Best Practices” Seminar

Mon, 2018-05-21 02:58
I’m very excited to announce new Australian dates for my highly acclaimed “Oracle Indexing Internals and Best Practices” seminar. This is a must attend seminar of benefit to not only DBAs, but also to Developers, Solution Architects and anyone else interested in designing, developing or maintaining high performance Oracle-based applications. It’s a fun, but intense, […]
Categories: DBA Blogs

18c Scalable Sequences Part III (Too Much Rope)

Tue, 2018-05-08 02:06
I previously looked in Part I and Part II how Scalable Sequences officially released in 18c can reduce index contention issues, by automatically assigning a 6 digit prefix to the sequence value based on the instance ID and session ID of the session. We need to be careful and consider this 6 digit prefix if […]
Categories: DBA Blogs

ODTUG Kscope18 Conference: Change of Presentation Times

Wed, 2018-05-02 22:13
For those of you that were planning to attend my presentations at the upcoming ODTUG Kscope18 Conference in Orlando (yes, I’m specifically talking to the two of you), both presentations have been allotted new times and locations. They are now confirmed as: New Indexing Features Introduced in Oracle 12c Release 2 (and 18c): When:  June […]
Categories: DBA Blogs

18c Scalable Sequences Part II (Watch That Man)

Wed, 2018-05-02 02:37
In Scalable Sequences Part I, I introduced this new 18c feature (although it was hidden and undocumented in previous releases). By adding a 6 digit prefix value that constitutes the first 3 digits for the Instance Id and the next 3 digits for the Session Id, it results in a sequence value that doesn’t always […]
Categories: DBA Blogs

“Let’s Talk Database” is Back !! Canberra/Sydney/Melbourne

Mon, 2018-04-30 20:39
Due to popular demand, I’ve been asked by Oracle to again run some “Let’s Talk Database” events this month. Dates and venues are as follows: Wednesday, 23 May – Canberra (Cliftons Canberra, 10 Moore St): Registration Link. Tuesday, 29 May – Melbourne (Oracle Melbourne Office, 417 St Kilda Road): Registration Link. Wednesday, 30 May – Sydney […]
Categories: DBA Blogs

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