Search

OakieTags

Who's online

There are currently 0 users and 21 guests online.

Recent comments

Oracle Indexes

12.2 Online Conversion of a Non-Partitioned Table to a Partitioned Table (A Small Plot Of Land)

In my previous post, I discussed how you can now move heap tables online with Oracle Database 12.2 and how this can be very beneficial in helping to address issues with the Clustering Factor of key indexes. A problem with this technique is that is requires the entire table to be effectively reorganised when most of […]

Let’s Talk Database: New Dates Released (You Can’t Talk)

Good news for all you Oracle Database folk in ANZ. I’ll be running a new series of “Let’s Talk Database” sessions at a venue near you in the coming months. I’ll be discussing two interesting topics, “Introduction to the Oracle Cloud for DBAs” and “Introduction to Oracle Database 12c Release 2“. The dates for this series and registration […]

12.2 Moving Tables Online (Real Cool World)

One of the really cool new features introduced in Oracle Database 12c Release 2 is the capability to MOVE tables ONLINE, while maintaining all the associated index structures. This was possible for table partitions in Oracle Database 12c Release 1 but only for Indexed Organized Tables before then. Rather than show a demo that just moves a table, […]

12.2 Index Advanced Compression “High” Part IV (The Width of a Circle)

A quick post (for me) with a long weekend beckoning… In Part I, Part II and Part III of looking at the new Index Advanced Compression level of “High”, we discussed how it can significantly decrease the size of your indexes in a manner not previously possible. This can result in significant reductions of index storage and […]

Hotsos Symposium 2017: Feb 27 – Mar 2 Dallas, Texas (I’m Afraid of Americans)

In just 3 weeks time, I’ll again have the pleasure of presenting at the awesome Hotsos Symposium in Dallas, Texas. It’s simply the best conference with regard to Oracle performance tuning anywhere. This year, I’ll be presenting on a couple of topics: New Index Features Introduced in Oracle Database 12c Release 2 Oracle Database 12c […]

12.2 Index Advanced Compression “High” Part III (I Can’t Give Everything Away)

If you like the look of the new Index Advanced Compression setting of “High” available with Oracle Database 12c Release 2 as I’ve discussed previously in Part I and Part II, well there’s a way to make this the default index compression method in your 12.2 database. Let’s begin by creating a table and explicitly […]

12.2 Index Advanced Compression “High” Part II (One Of My Turns)

In Part I, I introduced the new Index Advanced Compression default value of “HIGH”, which has the potential to significantly compress indexes much more than previously possible. This is due to new index compression algorithms that do more than simply de-duplicate indexed values within a leaf block. Previously, any attempt to completely compress a Unique […]

12.2 Index Advanced Compression “High” – Part I (High Hopes)

Oracle first introduced Advanced Compression for Indexes in 12.1 as I’ve discussed here a number of times. With Oracle Database 12c Release 2, you can now use Index Advanced Compression “High” to further (and potentially dramatically) improve the index compression ratio.  Instead of simply de-duplicating the index entries within an index leaf block, High Index […]

Oracle Database 12c Release 2: New Indexing Features – Long Identifiers (Several Species of Small Furry Animals Gathered Together in a Cave and Grooving With a Pict)

Oracle Database 12c Release 2 has now been officially released (at least on the Oracle Database Cloud and Oracle Database Exadata Express Cloud Services). In the coming weeks, I’ll be blogging about quite a number of new indexing features/capabilities/improvements that have been introduced in Oracle Database 12c Release 2. These include: Advanced Index Compression Tracking […]

Oracle 12c: Indexing JSON in the Database Part III (Paperback Writer)

In Part I and Part II, we looked at how to index specific attributes within a JSON document store within an Oracle 12c database. But what if we’re not sure which specific attributes might benefit from an index or indeed, as JSON is by it’s nature a schema-less way to store data, what if we’re not entirely sure […]