Before I draw this series on Understanding Flash to a close, I wanted to briefly touch on the subject of manufacturing. Don’t worry, I’ve taken heed of the kind feedback I had after my floating gate transistor blog post (“Please stop talking about electrons!“) and will instead focus on the commercial aspects, because ultimately they affect the price you will be paying for your flash-based (more...)
Now that the dust has settled on the announcement of Oracle’s new Exadata X5 Database Machine, I’ve been doing some research in order to update my History of Exadata post (it’ll be ready soon). While reviewing the datasheets and other collateral for the X5 I was struck by the meteoric increase in one particular statistic: the number of processor cores on each database server. Oracle is riding that Moore’s Law train all the way to the bank.
Back in July 2013, Oracle released the latest version of its flagship database product, Oracle 12c. Among the usual fanfare was information about a number of new options – including one known as Multitenant. With the Multitenant option, databases use a new architecture which features a container database (or CDB) which in turn contains one or more pluggable databases (or PDBs). Use of Multitenant requires a licence – which at the time of writing retails at $17,500 (more...)
First off, if you are not familiar with the term SIG, it stands for Special Interest Group. OAUG facilitates a number of SIGs to bring users together that share common or industries concerning certain Oracle products.
Unfortunately, the BI Publisher SIG has been offline for a number of years and has not been given the attention it needs to be a useful resource for members of OAUG. Well… I’m getting the band back together and (more...)
One of the important characteristics of flash memory is wear. We know from previous articles in this series that flash packages consist of dies, which contain planes, which contain blocks, which in turn contain pages. We also know that these pages contain individual cells which store the bits of data… but to understand what wear is we need to look a little bit closer at those cells, where we will find something called (more...)
Recently, I received my annual report from WordPress/Jetpack. I have always enjoyed these reports, so I thought I would make it public.
For the complete report, view it here: PSST0101 – 2014 Year in Blogging
Here’s a couple of excerpts:
Madison Square Garden can seat 20,000 people for a concert. This blog was viewed about 67,000 times in 2014. If it were a concert at Madison Square Garden, it would take about 3 (more...)
If you’ve been unfortunate enough to follow my dithering on Twitter recently you’ll know that I’ve been lurching between thinking that there is and isn’t a problem with Oracle’s tracking of I/O statistics in its AWR reports.
I’m now convinced there is a problem, but I can’t work out what causes it… so step 1 is to describe the problem here, after which step 2 will probably be to sit back and hope someone far (more...)
I’ve posted a new installation cookbook for using Oracle within a virtual machine running on Oracle VM. Surprisingly, I was unable to come up with a satisfactory method of accessing external storage that did not involve the use of Oracle ASMLib…
Filed under: Blog, Cookbooks, Database, Flash, Linux, Storage Tagged: cookbooks, database, oracle, oracle vm
I’ve spent a lot of time in this blog series talking about the challenges involved in using flash, such as the way that pages have to be erased before they are written and the restriction that erase operations take place on a whole block. I also described the problem of erase operations being slow in comparison to reads and writes – and the resulting processes we have to put in place to manage that problem (i. (more...)
I was recently contacted by a customer who runs a busy ERP system on their Oracle database. Their users have been screaming for some time about unpredictable performance, where application screens which would usually open in under a second suddenly take an age. ERP systems are legendary for this, of course, because as each screen loads the application tends to fire off a glut of queries to populate all the various fields, graphs and so (more...)
For the last couple of posts in this series I’ve been banging on about the importance of garbage collection (GC) in a flash system. I attempted to show you what happens if you don’t perform any GC at all (clue: you turn your flash device into a slow ROM), but clearly in the real world every flash array or SSD vendor has GC technology built into their flash translation layer. So why am I going (more...)
Suivez le blog : https://blogs.oracle.com/Cloud-Community-France/
Follow the link to find out whether I thought it was the most amazing product in the history of storage, or simply a rehashed Pillar Axiom hybrid array with some SSDs and a ton of marketing.
Strangest thing happened the other day during a customer upgrade. Our automated scripts were in the process of creating a view and I received the error:
ORA-01720: Grant Option Does Not Exist.
OK….. I get it… BUT…. I didn’t even execute a GRANT statement!? I was just executing a CREATE OR REPLACE VIEW…. what gives?
Doing some searching online, I didn’t find too much that fit my issue. Everyone was getting (more...)
Anyone that’s been following the release of 12.2 knows that Online Patching is the BIG feature that everyone is talking about. I’ve had the opportunity to utilize this new functionality and it’s been quite interesting. Online Patching is based on the Oracle Database 11.2 feature called (more...)
With the release of EBS 12.2, Oracle is making the claim that they have improved the attachment printing process. After reviewing the integration, I completely disagree; they have not given users a better solution. No matter how you slice it, Oracle EBS customers are no further ahead with (more...)
I received the following comment recently on an older Forms Personalization post:
how can i get result from the following equation through personalization
K_LINES.LINE_VALUE = K_HEADER.K_VALUE/K_HEADER.PRIME_K_NUMBER
i want to know what is the syntax and what is the required steps to get the result automatically
Brought a couple new PCs up recently and ran into the subject nasty error when attempting to access EBS. We’ve run into this before and we usually get it worked out one way or another. This time proved to be a bit challenging for some reason… Thought I (more...)
So calling Google Reader dead may be a bit premature, but Googles announcement of their intention to kill their baby all but killed it. On monday it is RIP for the reader. I’ve gone through disbelief to mourning the loss to a search for a replacement that best emulates what (more...)