This week we are in Singapore, our first ever visit. The main reason that we have come here is to look at some pictures painted by Sue’s Uncle Stan. They are also called the Changi Murals. Stanley Warren painted these murals when he was gravely ill in Changi during World War (more...)
It’s been a pretty annoying couple of days on the website server front.
The server locking up intermittently is one thing, and for all I know, maybe my fault? The incompetence of the hosting company is quite something else.
Just so you are aware why I was doing my nut yesterday, the hosting company had disabled my ability to force a power cycle of my dedicated server while they did a hardware test. They forgot to (more...)
Brian Hitchcock’s secret is simple. For twelve years, he has been reading books on Oracle Database. And taking extensive notes. And publishing them in the NoCOUG Journal. My secret is simple. For twelve years, I have been reading the extensive book notes that Brian has been publishing in the NoCOUG Journal. I’m the editor of the NoCOUG Journal but that’s not the point. It’s that simple.
I’m going to beat the OUG Scotland conference on 22nd June, and one of my sessions is a panel session on Optimisation where I’ll be joined by Joze Senegacnik and Card Dudley.
The panel is NOT restricted to questions about how the cost based optimizer works (or not), we’re prepared to tackle any questions about making Oracle work faster (or more efficiently – which is not always the same thing). This might be configuration, indexing, (more...)
Regarding the general issue, misiaq came up with a great suggestion, which was to use watchdog. It’s not going to “fix” anything, but if I get a reboot when the general issue happens, that would be much better than having the server sit idle for 5 hours until I wake up. Let’s see how that works out…
As a senior consultant, I often come to a client’s site to diagnose and fix a problem they have. It can be a performance problem, strange database behavior, database crash and more. The variety of problems and people to handle is huge and not easy at all. In some cases the client understands exactly how […]
Someone pinged me earlier today and said, “Do I even really need to know about logs in Enterprise Manager? I mean, it’s a GUI, (graphical user interface) so the logs should be unnecessary to the administrator.”
You just explained why we receive so many emails from database experts stuck on issues with EM, thinking its “just a GUI”.
From time to time we see a complaint on OTN about the stats history tables being the largest objects in the SYSAUXtablespace and growing very quickly, with requests about how to work around the (perceived) threat. The quick answer is – if you need to save space then stop holding on to the history for so long, and then clean up the mess left by the history that you have captured; on top of (more...)
Oracle Database 12c: Administrator Certified Master Technology moves on, and to keep pace with it, so should you. If you are an Oracle Certified professional in Oracle Database 12c administration Administration then you have demonstrated the skills and knowledge required to do the job. To demonstrate mastery of both theoretical and practical aspects of Oracle 12c […]
I’m pretty sure last night’s problem was caused by a disk failure in the RAID array. The system is working now, but it might go down sometime today to get the disk replaced. Hopefully they won’t do what they did last time and wipe the bloody lot!
The subject of this post is not about this specific incident, but more generally about what I’ve experienced over recent weeks/months.
Topic: in this post you can find examples of how to get started with using IPython/Jupyter notebooks for querying Apache Impala.
Apache Impala is an open source massively parallel processing (MPP) SQL Query Engine for Apache Hadoop. This post explores the use of IPython for querying Impala and generates from the notes of a few tests I ran recently on our systems. For completeness please that that several additional options exist to query Impala, some (more...)
It’s extremely nice to have a big audience. It’s very flattering that people care enough about what I say to be bothered to read it. The problem with having a large audience is people can get a very demanding at times.
I’ve mentioned the 1% rule (or 1-9-90) before. The number of people producing content in an internet community is really small compared to the number of people consuming it. That discrepancy can cause problems when (more...)
I was working on a minor problem recently where controlfile autobackups were written to the wrong location during rman backups. Taking controlfile autobackups is generally a good idea, even if you configure controlfile backups yourself. Autobackups also include an spfile backup, though not critical for restore, is still convenient to have. And autobackups are taken not only after backups, but more importantly every time you change the physical structure of your database, like adding or (more...)
Masking with Delphix (where duplicate blocks are shared making a new copy almost free storage wise and almost instantaneous) has 4 big advantages
Instant data, no copying
Ease of Use
Consistent across data centers and databases vendors
Virtual Data Masking
Delphix masking and virtualization is the most advanced solution in the market place, because Delphix doesn’t provision data. Instead of provisioning data, Delphix sets up pointers back to existing data for a new clone. When that (more...)
I was presenting at the UKOUG event in Manchester on Thursday last week (21st April 2016), and one of the sessions I attended was Carl Dudley’s presentation of some New Features in 12c. The one that caught my eye in particular was “DDL Logging” because it’s a feature that has come up fairly frequently in the past on OTN and other Oracle forums.
So today I decided to write a brief note about DDL Logging (more...)
It’s been forever since I last shared any of my performance troubleshooting experiences at work. This week, I got a case that I think is worth publishing, and I decided to write about it in my blog. So, here we go…
A few days ago, I received a complaint about unstable performance of one of frequently running SQL reports on a 11gR2 database. Most of the time it completed within a couple of minutes, however, on (more...)