OpenWorld 2017–where is the tech content ?

I can’t actually remember how many OpenWorld conferences I have attended. At a guess it would be around 7 or 8. Every year there is a criticism that there is “not enough technical content”.

Well I’m calling “fake news” on that. I can’t remember a time that I’ve struggled to find sessions that I’m interested in. Don’t get me wrong – I would love it if there was double the technical content especially in the (more...)

Partition-wise join

So just what is a “partition-wise” join ?  We will use a metaphor to hopefully Smile explain the benefit.

image

Let’s say two people, Logan and Shannon, decide to move in together.  If each of them already have an existing residence, they will both have a lot of the common items that you find in any household.  So they have a decision to make – do they keep two of everything, or do they have (more...)

Updating indexes with partition maintenance

An index is basically a structure that maps keys (values) in columns to the physical location of their corresponding rows in a table.  So if you move the rows (ie, change the physical location of a row) then the index entries for those rows need to be updated, or the index is no longer usable.  And as most people are aware, the latter is the default when you perform a partition maintenance operation (more...)

LOBs and tiny typos

This one caught me out – I was racing around looking for bugs, or parameter files, or hidden settings that stopped SECUREFILE lobs from being created.  Here was my incredibly simple test case – create a securefile LOB, and then make sure it’s a securefile.


SQL> create table t1 ( b blob ) lob ( b ) store as securfile;

Table created.

SQL> select securefile
  2  from   user_lobs
  3  where  table_name = 'T1';

SEC
 (more...)

Partitioning Guide updated

partitioning2

Just a quick note to say I’ve updated our Getting Started With Partitioning Guide! 9 easy to follow demonstrations to get developers up to speed with handling large databases. Check it out here


The AskTOM team at OpenWorld 2017

The AskTOM team will be out and about at OpenWorld in October, so if you are at the conference as a full attendee, or just with a Discovery pass, please come up and say Hi!  As well as our session talks, we’ll be doing impromptu discussions and mini-sessions during the week either in the Developer Lounge area or the Exhibition Hall, so keep your eyes open on the OpenWorld twitter feeds during the week. (more...)

Please keep your foreign keys

I came across an interesting blog post the other day about whether databases should be (declaratively) enforcing the foreign key relationships between tables.  The blog post discussed the issue of foreign keys being temporarily disabled to perform data loading, and then encountering the problem of what to do when those foreign keys cannot be re-enabled due to bad data.  Perhaps they should just be omitted altogether ?  I don’t want to put words (more...)

Upgrade with no effort

We all know what upgrades mean.  Installation…Configuration…Patching…Testing…Deployment…Change approvals…Meetings…Long hours…Perhaps pulling an “overnighter” but hopefully never having to enact the dreaded “Backout Plan”.

Or…. that stuff can “just happen” without you worrying about it at all! 

I logged on to my Exadata Cloud Express database on the weekend, and lo and behold, it is not Oracle Database 12c anymore.  It is 12c Release 2 !

A look back through my email Inbox, and I (more...)

Behold the full stack developer

Well…sort of.  Well…not really Smile

This blog post is really about how with just a little bit of knowledge and patience you can bring several cool technologies and tools together to achieve what you want.

I’m off to OpenWorld at the start of October which will be an awesome event as usual, and in the last few days, the session catalog has been released, detailing the topics and the scheduling for events throughout the OpenWorld (more...)

12c Statistics on load–special cases

One of the cool features in 12c is the automatic collection of optimizer statistics when a table is either created or loaded via direct path from empty.  This makes a lot of sense because it saves us from what used to be the mandatory second step of gathering statistics whenever we loaded an empty table with data.

For example

11.2.0.4


SQL> create table t1 as
  2  select * from dba_objects;

Table  (more...)