Tag: 12c

Another little 12c improvement

You’ve got a huge table right? Massive! Immense! And then something bad happens. You get asked to remove one of the columns from that table. “No problem” you think. “I won’t run the ‘drop column’ command because that will visit every block and take…

Partial indexing – get the dictionary definitions right

Just a quick post to clear up some confusion that can be seen on the partial indexing capabilities in Oracle Database 12c and above. I was at an event in the Oracle Perth office last week, and an attendee mentioned that they thought the…

Identity columns in 12c … just a sequence ?

This question came to me over Twitter, so I thought I’d whip out a quick post on it   Yes, we do implement the IDENTITY column via a sequence.  (Digression – I think this is a smart thing to do.  After all, we’ve had…

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…

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…

Quick tip–identity columns

Lets say I’ve been reading about schema separation, and thus I am going to have a schema which owns all of my objects, which I’ll call APP_OWNER, which will have no connection privilege and a separate schema called APP_ADMIN which will take care of…

Transportable Tablespace–part 2

I did a little demo of sharing a tablespace between two databases a few days back – you can see the details here or by just scrolling down if you’re on the home page. To avoid clouding the demonstration I omitted something in the…

Sharing a tablespace between 2 databases

I was reading an interesting discussion today about multiple databases each containing large amounts of read-only data.  If that read-only data is common, then it would make sense to have a single copy of that data and have both databases share it. Well, as…

12c Release 2, set feedback enhancement in SQL PLus

There’s a nice little touch to the “set feedback” command in SQL PLus in 12.2. There is a new “only” clause in the SET FEEDBACK command, so you can run queries but the resulting rows are not shown in the display. They are still…

12c Release 2 – Transparent Data Encryption online !

It doesn’t take a rocket scientist to know that even if you have incredibly stringent controls on user authentication, user authorisation etc, that wont save you if your data on disk is not encrypted.  All you need is an errant tape, a missing disk,…

TimTams, Twelve Two, and tete-a-tete !

What do you do when you’re an Australian, you’re at Oracle Headquarters, 13,000 kms from home you bump into someone whilst grabbing a coffee Well…naturally, you lure them over with a packet of our famous Australian chocolate biscuits, grab a camera and have a…

Oracle Database 12c Release 2 is here !

Since OpenWorld 2016 when we first saw some of the cool features in Oracle Database 12c Release 2, many IT professionals out there have been exploring the release via our various cloud offerings, but if your organization has not yet embraced the cloud, then…