Subscribe: Padraig's Blog
http://padraigs.blogspot.com/feeds/posts/default
Added By: Feedage Forager Feedage Grade C rated
Language: English
Tags:
blog  data  database  direct  found  oracle database  oracle  paper  project  solaris  system  tablespace  temporary tablespace  usb 
Rate this Feed
Rate this feedRate this feedRate this feedRate this feedRate this feed
Rate this feed 1 starRate this feed 2 starRate this feed 3 starRate this feed 4 starRate this feed 5 star

Comments (0)

Feed Details and Statistics Feed Statistics
Preview: Padraig's Blog

Padraig's Blog





Updated: 2017-10-01T02:29:25.145-07:00

 



Blogging at posulliv.com Now

2009-02-24T21:02:08.825-08:00

I've decided to start blogging with WordPress now as it just makes putting code samples and things like that so much easier! Also, I had a domain name for a while so I figured I might as well use it and it will encourage me to blog more. I really want to blog more at the moment since I'm working on an interesting project for my database course this semester.You can find my blog here from now on.



Drizzle: A Pretty Cool Project

2009-01-28T20:01:18.824-08:00

Drizzle is a pretty cool project whose progress I've started following in the last few weeks. I'm trying to contribute in a tiny way if I can by confirming bug reports. If I had more time, I'd like to try resolving some bugs. Hopefully, I'll find some spare time to do that in the future.I think its definitely a project worth keeping an eye on though. Check it out if you have the time.



A Subtle Bug

2009-01-24T20:09:02.697-08:00

At university, I work in a research group where we are developing an application in C++ that runs on both Linux and Windows. Since I do most of my development on Linux, I rarely test our application on Windows (other people in the group who run Windows test on that platform). Recently, one of my colleagues was encountering a problem while running our application on Windows that I was not



What is Direct Data Placement

2009-01-05T23:28:57.226-08:00

I'm currently studying Oracle's white paper on Exadata and came across the following paragraph:"Further, Orace's interconnect protocol uses direct data placement (DMA - direct memory access) to ensure very low CPU overhead by directly moving data from the wire to database buffers with no extra data copies being made."This got me wondering what direct data placement is. First off, the interconnect



Semester Project Finally Finished

2008-12-16T07:17:31.175-08:00

We just finished our semester project yesterday for the class I am taking on High Performance Computing. It was a pretty interesting project based on the topic of software fault injection.More details can be found in the project report here.



Its Been a While

2008-11-30T16:50:18.773-08:00

I had removed this blog but kept getting some emails asking for links to certain posts so I just posted some old posts again so that they are available to anyone who is interested in them.As an update for what I'm doing, I'm currently in my second year of graduate school. I plan on taking a grad class in database systems next semester so that should be interesting. I'll get to learn a lot about



Configuring Oracle as a Service in SMF

2008-11-30T13:38:38.488-08:00

In Solaris 10, Sun introduced the Service Management Facility (SMF) to simplify management of system services. It is a component of the so called Predictive Self Healing technology available in Solaris 10. The other component is the Fault Management Architecture.In this post, I will demonstrate how to configure an Oracle database and listener as services managed by SMF. This entails that Oracle



srvctl Error in Solaris 10 RAC Environment

2008-11-29T19:54:47.935-08:00

If you install a RAC environment on Solaris 10 and set kernel parameters using resource control projects (which is the recommended method in Solaris 10), then you will likely encounter issues when trying to start the cluster database or an individual instance using the srvctl utility. As an example, this is likely what you will encounter:$ srvctl start instance -d orclrac -i orclrac2PRKP-1001 :



Building a Modified cp Binary on Solaris 10

2008-11-29T19:54:41.595-08:00

I thought I would write a post on how I setup my Solaris 10 system to build an improved version of the stock cp(1) utility that comes with Solaris 10 in case anyone arrives here from Kevin Closson's blog. If you are looking for more background information on why I am performing this modification, have a look at this post by Kevin Closson.GNU Core UtilitiesWe need to download the source code for



Oracle 10gR2 RAC with Solaris 10 and NFS

2008-11-29T19:54:32.233-08:00

Recently, I setup a 2 node RAC environment for testing using Solaris 10 and NFS. This environment consisted of 2 RAC nodes running Solaris 10 and a Solaris 10 server which served as my NFS filer.I thought it might prove useful to create a post on how this is achieved as I found it to be a relatively quick way to setup a cheap test RAC environment. Obviously, this setup is not supported by Oracle



Creating a UFS File System on an External Hard Drive with Solaris 10

2008-11-29T19:51:00.070-08:00

Recently, I wanted to create a UFS file system on a Maxtor OneTouch II external hard drive I have. I wanted to use the external hard drive for storing some large files and I was going to use the drive exclusively with one of my Solaris systems. Now, I didn't find much information on the web about how to perform this with Solaris (maybe I wasn't searching very well or something) so I thought I



Playing with Swingbench

2008-11-29T19:54:26.712-08:00

Swingbench is a free load generator (and benchmarks generator) designed by Dominic Giles to stress test an Oracle database. In this post, I will be playing with Swingbench and showing how it can be used. This article will focus on comparing the performance of buffered I/O versus un-buffered I/O (i.e. direct I/O) using the Swingbench tool. Since this article is not about direct I/O (I encourage



Observing Oracle I/O Access Patterns with DTrace

2008-11-29T19:54:18.190-08:00

In this post, I will use the seeks.d and iopattern DTrace scripts, which are available as part of the DTraceToolKit (This toolkit is an extremely useful collection of scripts created by Brendan Gregg), to view the I/O access patterns typical of Oracle. DTrace is able to capture data throughout the kernel and so the job of finding access patterns has been greatly simplified.The system on which



Installing & Configuring a USB NIC on Solaris

2008-11-29T19:54:09.422-08:00

In this post, I will provide a very quick overview of how to install and configure a USB network interface on Solaris.Obtaining the USB DriverThe driver for a generic USB network interface which should cover the majority of USB NIC devices can be downloaded from here.Installing the USB DriverAfter downloading the driver, uncompress the gunzipped file and extract the archive as the root user. #



Generating a System State Dump on HP-UX with gdb

2008-11-29T19:53:59.390-08:00

I have previously used the gdb (GNU Debugger) to generate oracle system state dumps on Linux systems by attaching to an Oracle process. The ability to do this has been well documented by Oracle on Metalink (Note 121779.1) and in other locations.The problem with this is that it does not work on the HP-UX platform. I found this out at the wrong time when trying to generate a system state dump



Temporary Tablespace Groups

2008-11-29T19:53:49.654-08:00

Temporary tablespace groups are a new feature introduced in Oracle10g. A temporary tablespace group is a list of tablespaces and is implicitly created when the first temporary tablespace is created. Its members can only be temporary tablespaces.You can specify a tablespace group name wherever a tablespace name would appear when you assign a default temporary tablespace for the database or a



Installing a Back Door in Oracle 9i

2008-11-29T19:51:52.491-08:00

In this post, we will demonstrate a way an attacker could install a back door in a 9i Oracle database. The information on this post is based on information obtained from Pete Finnigin's website and the 2600 magazine. The version of the database we are using in this post is:sys@ORA9R2> select * from v$version;BANNER----------------------------------------------------------------Oracle9i Enterprise



OCFS2 Mount by Label Support

2008-11-29T19:51:42.096-08:00

While messing around with OCFS2 on my RHEL4 install, I discovered that if I created an OCFS2 filesystem with a label, I was unable to mount it by that label. I would encounter the following:# mount -L "oradata" /ocfs2mount: no such partition found#I found this quite strange and did some investigation. The version of util-linux that was present on my system after a fresh RHEL 4 install was -



White Paper at Oracle OpenWorld

2008-11-29T19:51:32.905-08:00

A white paper that I was part of writing is being presented at Oracle OpenWorld this week. The paper is entitled 'High Availability Options for the Oracle Database'. It is being presented by Dan Norris and I wrote the sections on Export/Import and data pump. The paper is available for download from the IT Convergence website here.Dan is kinda like my mentor here at IT Convergence. He has a lot of



First Paper Accepted

2008-11-29T19:51:20.917-08:00

I just found out that my first paper has been accepted! Its a pretty nice feeling. This paper was based on research I did in the summer of 2005 with the MISL research group in UCC.A pre-print version of the paper is available here. It was accepted to a conference called First International Workshop on Practical Issues in Building Sensor Network Applications.Now I'm hoping my paper on small-world



Audting SYSDBA Users

2008-11-29T19:51:12.257-08:00

I recently came accross this feature in Oracle introduced in 9i where all operations performed by a user connecting as SYSDBA are logged to an OS file. I'm sure most DBA's are familiar with thisfeature already but I have only just been enlightened!!To enable this feature auditing must be enabled and the AUDIT_SYS_OPERATIONS parameter must be set to TRUE. For example:sys@ORCLINS1> ALTER SYSTEM SET