Although they didn’t win, the built some very cool stuff, combining Google Glass, Philips Hue, Internet of Things, and possibly a kitchen sink in there somewhere, into what can only be described as a smart holster. You know, for guns.
You read that right. This project was way out of our usual wheelhouse, which (more...)
Recently I’ve noticed the occasional thread in Oracle newsgroups and lists asking about hugepages support in Linux, including ‘best practices’ for hugepages configuration. This information is out on that ‘world-wide web’ in various places; I’d rather put a lot of that information in this article to provide an easier way to get to it. I’ll cover what hugepages are, what they do, what they can’t do and how best to allocate them for your particular (more...)
Editor’s Note: Hey, a new author! Colleague and Friend of the ‘Lab, Joyce Ohgi, a principal usability researcher here at Oracle Applications User Experience, joined several of our guys and tall man, all-around good dude and Friend of the ‘Lab, Rafa Belloni (@rafabelloni), to form a super-powered hackathon team last week.
This is her story, as told from the inside. Enjoy.
I earned $600 in a hackathon without writing a single line of code.
Exadata is a powerful system, able to provide exceptional performance. Much of this peformance is due to Smart Scans, Exadata’s mechanism for shifting the workload to the storage cells and having them filter and reduce the amount of data the database servers must process. Not every Smart Scan that starts ends up completing, though. Oracle may decide that a different path, one that doesn’t include a Smart Scan, may be more efficient. Certain conditions must (more...)
I have installed SQL Developer (with JDK) on Windows many times before, and almost all the time I receive the system error bellow when trying to execute it by the first time. Due to this, I decided to publish the…
Performance is one of the big watchwords in tht IT industry; nowhere is it more often used than in the database arena, and it’s usually not a good sign. End users know nothing, really, of the inner workings of the database yet they are the first to point the ‘finger of blame’ at the database when the processing speed slows or queries take longer than they would like to return data. [For end users performance (more...)
Chained and migrated rows in an Oracle database can seriously impact I/O performance, especially with Exadata. In a ‘normal’ Oracle database [read that as "non-Exadata, non-ASM" database] chained rows, in small numbers where that usually means 1% or less of the total rows in a table, are generally a nuisance. The performance hit they generate in such a situation is small and may not even be noticed by the end users. Add more chained/migrated rows (more...)
Some of the strangest ideas (to me, anyway) can be found in the depths of PL/SQL code, be it a package, a procedure, a function or an anonymous block. Granted, such decisions may be the result of budgetary considerations which prevented a more robust and reliable application design. I was looking at some code just recently that made me scratch my head in wonder and disbelief. Let’s look at a similar piece of PL/SQL that (more...)
A recent IT-related survey had in its list of questions one rather interesting offering:
“Are there any safeguards preventing the DBA from accidentally dropping a table?”
That is probably not a commonly considered aspect of data security however it is an issue that should be voiced and addressed. How do you ensure that the DBA doesn’t, or can’t, drop a table accidentally? Oracle has at least two ways to ensure that a table cannot (more...)
At March I will be presenting my very successful seminar “Mastering Backup and Recovery” in some countries of Latin America for the very first time. Thank you Panama, Chile and Brazil OUGs for inviting me to your amazing countries! Please, use the following links for registration and also to find more information about the seminar: […]
Hi All, On February 4, 2014 at 9:30 am PT I will be talking on the next OTN Virtual Developer Day about Oracle VM and Oracle Database. Come and discover the answers for the following questions: Does an Oracle Database perform well on a virtualized environment? What virtualization technology is more stable and […]
Some time ago, I received the request to migrate some Windows 2008 Servers to my Oracle VM farm and after complete the P2V migration the newly create VM would not start. It would crash on boot with blue screen and error: STOP: 0x0000007B (0xXXXXXXXX,0xXXXXXXXX,0×00000000,0×00000000) This issue is related to the storage drivers needed for the guest […]
I hit the following problem with a 126.96.36.199 database running on Windows 2003 this morning (info pulled from the alert log). The database had failed to restart after a client’s cold backup process ALTER DATABASE MOUNT Wed Jan 15 22:32:08 2014 ORA-09341: scumnt: unable to mount database OSD-04400: unable to acquire internal semaphore for process
I’ve been trying to install open source software. In this case an application called Moodle. I followed the instructions to install it on an Ubuntu Server vm but they were missing a couple of key points.
After installing the Moodle package (under “Moodle Installation” in the instructions) you need to (more...)
Top 5 Key Reasons Why Oracle VM is Best for Oracle Database When: Tuesday December 17th , 10am PST Register Here: http://event.on24.com/r.htm?e=725350&s=1&k=1512E332202610FE9518AB8B01354C6A&partnerref=Francisco Oracle VM application-driven architecture is designed for rapid deployment and ease of lifecycle management providing IT a highly scalable and cost effective virtualization solution for Oracle (more...)