Time is of the essence – The Fourth Dimension in Oracle Database 12c (on Flashback and Temporal Database)
Time has always been an important dimension for data in any database with topics like when was data created, when are records valid, how did records evolve over time, can we compare with yesteryear or even travel through time and data. The Oracle Database 12c release added a number of features in this area of time and history. The powerful Flashback mechanism is enhanced in many ways, such as to allow history to be constructed, (more...)
I had the pleasure of rebuilding an Exadata rack for a customer a while back, and it provided a pretty good refresher in backup and recovery for me. As DBAs, we back up databases all the time, but the restores are performed much less frequently. In the case of this rack, there were several databases across multiple ASM diskgroups. One of the goals of the rebuild was to consolidate all of the databases into a (more...)
I’ve been doing some Enterprise Manager installs a bit more lately. At the same time, I’ve been working on Data Integration items such as GoldenGate and ODI. What these products have in common are that they require an Oracle Database for a repository. Needless to say I’ve been installing a lot of 220.127.116.11 databases in test and production environments. The one thing that has been consistent is the issue I keep seeing (more...)
A rather not so great post about an ORA-00600 error i faced on a standby database. Environement was 18.104.22.168 on Sun Super Cluster machine. MRP process was hitting ORA-00600 while trying to apply a specific archive log.
The error message was something like this
MRP0: Background Media Recovery terminated with error 600 Errors in file /u01/app/oracle/product/22.214.171.124/diag/diag/rdbms/xxxprd/xxxprd1/trace/xxxprd1_pr00_6342.trc: ORA-00600: internal error code, arguments: , , , , , , , (more...)
Almost exactly a year ago I published a post covering my first impressions of the ASM Filter Driver (ASMFD) released in Oracle 126.96.36.199, followed swiftly by a second post showing that it didn’t work with 4k native devices.
When I wrote that first post I was about to start my summer holidays, so I’m afraid to admit that I was a little sloppy and made some false assumptions toward the end – assumptions (more...)
This is no regular bit of work and it will probably (and hopefully) never hit you in a production setup…
The prerequisite is that you know how on-line data replication in general, and Dbvisit Replicate specifically, work.
The following case is true:
I had half of a replication pair running.
It means that the MINE process was running, converting REDO-log in PLOG-format. The APPLY process had not yet started because the target database was (more...)
This week I decided to redo a few of my virtual box machines and build a few new ones for testing. Getting the Oracle Linux 6.6 installed was a breeze; however, when I started to install the Oracle Database 12c binaries I was hitting errors during the linking phase. This had me puzzled for a bit to say the least. I kept getting this error:
After driving myself nuts, I decided to look closer (more...)
I think this is cool as it gives you the ability to use SQL on an HBase table.
To test this, let's say you login to HBase and you create an HBase table like (more...)
If you’ve run an exachk report, y0u may have seen the following message with regard to your databases:
|FAIL||Database Check||Database parameter CLUSTER_INTERCONNECTS is NOT set to the recommended value||db01:dbm011, db02:dbm012||View|
This check is commonly seen when a database is created on Exadata without using the custom “Exadata” templates included with the database creation assistant. These customized templates include a multitude of recommended parameter settings found in (more...)
Kscope15 promised to be a brand new experience in more than one way.
As I start to write this report, I am flying from Düsseldorf airport to Atlanta. It will be the first time flying to the United States with a stopover, and because of Erik van Roon, I came prepared. With just carry-on luggage, I should end up at my final destination, Fort Lauderdale, Florida, together with my ‘stuff’. I am flying Delta (more...)
Dumb title for a blog post? No, not really I guess…
- ICE.TCP Pro
- Reflection ‘X’
And a few other obscure applications that I cannot even recall anymore.
Currently, and over the last 6 to 8 years, I have been using ZOC.
The background of this story is: In the beginning these were the first DOS PC’s (more...)
For those of you who haven’t been working with on-line data replication; in short, it is a way to copy data from a source database to a target database and do this on-line (both databases are active) and do it near-real-time.
This means that when you enter data in you source database, you can immediately query it from your target database. This makes on-line data replication ideal for numerous tasks, like moving and / or (more...)
With the launch of DB 12c in 2013, Oracle introduced a new architectural concept, called “multitenant databases”, where you have one super database (=container; CDB) and one or more sub databases (= pluggable DBs; PDB).
Before running the installer on an Oracle Linux 6 environment, a library can be installed through yum to meet all the system per-requisites:
yum install oracle-rdbms-server-12cR1-preinstall
The software installer and DBCA are similar to 11g, except for this screen where (more...)
This is a very simple post to show the results of some recent testing that Tom and I ran using Oracle SLOB on Violin to determine the impact of using virtualization. But before we get to that, I am duty bound to write a paragraph of text featuring lots of long sentences peppered with industry buzz words. Forgive me, it’s just the way I’m wired.
It is increasingly common these days to find database environments running (more...)
I’ve run into a few customers recently who have had problems with their ASM rebalance operations running too slowly. Surprisingly, there were some simple concepts being overlooked – and once these were understood, the rebalance times were dramatically improved. For that reason, I’m documenting the solutions here… I hope that somebody, somewhere benefits…
1. Don’t Overbalance
Every time you run an ALTER DISKGROUP <NAME> REBALANCE operation you initiate a large amount of I/O workload as (more...)
Like many other Oracle professionals and speakers I will be attending IOUG Collaborate 2015 this year in Las Vegas. I’m not a big fan of Las Vegas, but hey cannot turn down an opportunity to speak, especially when IOUG asked me to do more than one session.
This year my schedule is going to keep me busy; yet full of good topics that cover both EM12c and GoldenGate. If you are going to be (more...)
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