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SqlPlus: Turn off substitution variables (Ampersand)

admin — Sat, 07 Jan 2012 20:27:01 +0000

SQL> set define off

Prebop + Ant = Perfect Build

admin — Mon, 22 Aug 2011 19:25:29 +0000

If you need/want C-style preprocessor macro support in a Java project, then try Prebop. Prebop uses Ant and provides a plugin for Eclipse. Here’s a good explanation of the necessary steps to setup a build script within Eclipse.

Recreate Oracle Redo Logs

admin — Thu, 21 Jul 2011 13:18:39 +0000

eg:

1. alter database drop logfile group 1;
2. alter database add logfile group 1 (
‘/u01/oralog/redo01a.log’,
‘/u02/oralog/redo01b.log’) size 250m reuse;

that’s it. Keep in mind that it’s not possible to drop the “CURRENT” log group (switch to another redo log group with: alter system switch logfile). If the status of the log group you want to recreate is “ACTIVE” then perform a global checkpoint (alter system checkpoint global).

Taken from: http://www.idevelopment.info/data/Oracle/DBA_tips/Database_Administration/DBA_34.shtml

Oracle EM Agent – Silent installation

admin — Mon, 04 Jul 2011 11:50:29 +0000

./runInstaller -silent -responseFile /home/oracle/linux_x64/response/additional_agent.rsp

Detach/Remove Oracle Home from Inventory

admin — Mon, 04 Jul 2011 11:49:03 +0000

If you want to manually remove Oracle Home(s) from the Ora Inventory then try this one:

./runInstaller -silent -detachHome ORACLE_HOME=[absolute path to Oracle Home]

runInstaller is available in any Oracle Home under oui/bin.

encfs – shared directory

admin — Mon, 24 Jan 2011 20:20:20 +0000

If you want users other than the owner to access a fuse mount / encrypted directory you
need to specify the “allow_other” fuse option!

encfs /home/dummy/.private /home/dummy/private – -o allow_other

Unmount with:

fusermount -u /home/dummy/private

Graphical analysis of SAR output

admin — Mon, 27 Dec 2010 12:16:58 +0000

This is a handy utility for the graphical analysis of the Linux SAR Output.

http://sourceforge.net/projects/ksar/

No Fullscreen Youtube in Ubuntu 10.10 using latest Google Chrome Stable

admin — Wed, 01 Dec 2010 21:55:28 +0000

sudo mkdir /etc/adobe
sudo su
sudo echo \"OverrideGPUValidation = 1\" >> /etc/adobe/mms.cfg

works for me.

Reference:

http://ubuntuforums.org/showthread.php?t=1593363&page=4
http://www.noobrescue.com/blog/flash-fullscreen-doesnt-work-on-ubuntu-10-10

Oracle VM / Xen: Resize VDISK of paravirtualized guest

admin — Fri, 26 Nov 2010 15:51:45 +0000

* Shutdown the guest

* Find the vdisk image file and (if increasing) add size to the disk (in this case 2GB):

dd if=/dev/zero bs=1M count=2000 >> system.img

* Attach image file as block device in Dom0:

xm block-attach 0 ‘file:/OVS/templates/System.img’ xvda w

* List partitions:

fdisk -ul /dev/xvda

Disk /dev/xvda: 16.4 GB, 16462456320 bytes
255 heads, 63 sectors/track, 2001 cylinders, total 32153235 sectors
Units = sectors of 1 * 512 = 512 bytes

    Device Boot      Start         End      Blocks   Id System
/dev/xvda1   *          63      192779       96358+ 83 Linux
/dev/xvda2          192780    23824394    11815807+ 83 Linux
/dev/xvda3        23824395    28049489     2112547+ 82 Linux swap / Solaris

* In this case I want to resize xvda2 and I decided to drop and recreate the swap partition
(I’ve used fdisk to drop the swap partition and after the resizing I recreated it wih fdisk and mkswap)

* filesystem check of the partition you want to resize:

e2fsck -f /dev/xvda2

* try to resize the partition with parted:

parted /dev/xvda
-> print (to find the partition number)
-> resize [partition number] / set start and end

** if parted throws “File system has an incompatible feature enabled.” disable partition flags:
(to check which partition flags are set use: tune2fs -l /dev/xvda2)

Remove flags:

tune2fs -O ^has_journal /dev/xvda2
tune2fs -O ^dir_index /dev/xvda2
debugfs -w /dev/xvda2 -R “feature -ext_attr”

Recheck the filesystem: e2fsck -y -f /dev/xvda2

debugfs -w /dev/xvda2 -R “feature -resize_inode”

Recheck it again: e2fsck -y -f /dev/xvda2

* try parted again – it should work now

* after the resize set the partition flags again:

tune2fs -j /dev/xvda2
debugfs -w /dev/xvda2 -R “feature dir_index ext_attr resize_inode”

* recheck the partition:

e2fsck -y -f /dev/xvda2

* find the vdev id (for detaching):

xm block-list 0

* detach the virtual disk:

xm block-detach 0 [vdev id] -f

* Startup the guest

-> everything should be fine!

jzy3d – java library for scientific 3d plotting

admin — Mon, 19 Jul 2010 18:30:01 +0000

Jzy3d stands for Java Easy 3d, and allows a rapid display of 3d scientific data. Users can define z=f(x,y) functions binded to (customizable) colormaps, as well as rendering predefined simple 3d shapes programmaticaly or from csv files. Several strategies can be applied to generate surface, such as a Delaunay tesselation that let you build a surface from unknown structured datasets.

The API has been written with the goal to hide the burden of working with OpenGL, 3d polygon ordering and transparency management. Jzy3d replies to the need of a simple tool like plot3d in Matlab and let the user concentrate on its data rather than UI programming.

It’s open-source (BSD license), fast and easy to use – fabulous library!

http://code.google.com/p/jzy3d/