Another interesting topic that goes over and above the CDB Resource Manager Plans I described earlier this week is the implementation of IORM Plans for Pluggable Databases. Pluggable Databases are an interesting object for studies, and I like to research things. When 12c came out there was no support for offloading initially, it is required that you are on cell software 12.1.x.x.x for full 12c support on Exadata. One aspect I was particularly (more...)
Inspired by Sue Lee’s presentation at Enkitec’s E4 conference I decided to re-run my test suite to work out how you can use Database and I/O Resource Manager in Oracle 184.108.40.206.2 to help consolidating databases in the new Multi-Tenant architecture. I should point out briefly that the use of Multi-Tenant as demonstrated in this article requires you to have a license. Tuning tools shown will also require you to be appropriately (more...)
As part of the 12c release of the database and cellos Oracle introduced the ability to perform Smart Scans on inline LOBs. The enhancement is certainly for Secure Files only. And as always, if you would like to read up about Secure Files you can head over to Tim Hall’s website for the details.
To demonstrate the new behaviour I have used an 220.127.116.11 BP 22 database on Exadata 11.2.3. (more...)
This is going to be a very short post for a change. I have used Swingbench extensively and really love the tool. Many thanks to Dominic Giles!
Recently he announced a new tool on his blog that you can use to inflate your data volume. So instead of using the “-scale” argument when executing oewizard you can just keep the defaults and later on create as much data as you like. Here is an example, (more...)
Teaching is on the things I like doing, and currently I am investigating the Oracle 12c features around caching data in the various memory areas. Since the In-Memory (cost) option has been discussed by other far more knowledgeable people I would like to share some findings about the big table caching here.
In Oracle 12c you have two additional options to cache information: full database caching and big table caching. The first is (more...)
This post is the result of some testing I performed on Exadata data file creation. You may know that Exadata offloading incorporates SQL optimisations as well as some infrastructure work. For quite some time Exadata allowed the DBA to create data files a lot quicker than on traditional systems. This has been documented before, for example by @mpnsh here
The final comment on his blog entry was a remark that data file creation is quite (more...)
Little things worth knowing: Is there a penalty in establishing a connection to Oracle using the MAA connection string? Part 2
In the very lengthy previous post about the MAA connect string I wanted to explain the use of the MAA connection string as promoted by Oracle. I deliberately kept the first part simple: both primary and standby cluster were up, and although the database was operating in the primary role on what I called standby cluster (again it’s probably not a good idea to include the intended role in the infrastructure names) there was no (more...)
Little things worth knowing: Is there a penalty in establishing a connection to Oracle using the MAA connection string?
Sorry for the long title!
I had a question during my session about “advanced RAC programming features” during the last Paris Oracle Meetup about the MAA connection string. I showed an example taken from the Appication Continuity White Paper (http://www.oracle.com/technetwork/database/options/clustering/application-continuity-wp-12c-1966213.pdf). Someone from the audience asked me if I had experienced any problems with it, such as very slow connection timeouts. I haven’t, but wanted to double-check anyway. This is a (more...)
I recently applied system patch 20132450 to my 18.104.22.168.0 installation on a 2 node RAC system on Oracle Linux 7.1. While ensuring that OPatch is the latest version available I came across an interesting command line option in opatchauto. It is called “-generateSteps”.
[oracle@rac12sby1 ~]$ $ORACLE_HOME/OPatch/opatchauto apply -help OPatch Automation Tool Copyright (c) 2015, Oracle Corporation. All rights reserved. DESCRIPTION Apply a System Patch to Oracle Home. User specified the (more...)
This is another post to remind myself that Oracle evolves, and what I thought I knew might no longer be relevant. So double-checking instead of assuming should become a habit!
Today’s example: direct path inserts. I seemed to remember from Oracle 9i that a direct path insert ignores referential integrity. This is still confirmed in the 9i Release 2 Concepts Guide, chapter 19 “Direct Path Insert”. Quoting from there:
During direct-path INSERT operations, Oracle appends (more...)