Ubuntu

root@***:/var/log# uname -a
Linux ***2.6.31-19-generic-pae #56-Ubuntu SMP Thu Jan 28 02:29:51 UTC 2010 i686 GNU/Linux
root@***:/var/log# ssh -V
OpenSSH_5.1p1 Debian-6ubuntu2, OpenSSL 0.9.8g 19 Oct 2007

Redhat

[root@*** root]# uname -a
Linux *** 2.4.21-63.ELsmp #1 SMP Wed Oct 28 23:15:46 EDT 2009 i686 i686 i386 GNU/Linux
[root@*** root]# ssh -V
OpenSSH_3.6.1p2, SSH protocols 1.5/2.0, OpenSSL 0x0090701f

sshProbe.tcl
SSH_PROBE_SCRIPT.tcl

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#!name = SSH_PROBE_SCRIPT
########################################################################################
# 
# Description :
#    Script connects sends a connect request to a SSH server to see if its alive.
#
# ACE version :
#   1.0+
#    
# Author :
#   Chris Greenough (Chris.Greenough@nau.edu)
#
# Parameters :
#   [debugFlag]
#     debug  - default 0. Do NOT turn on while multiple probes are configured
#
# Example config :
#       probe sshProbe script
#           script SSH_PROBE [0]
# 
########################################################################################
#-------------------------------------------
# debug procedure
# set the EXIT_MSG environment varaible to help debug
# also print the debug message when debug flag is on
#-------------------------------------------
proc ace_debug { msg } { 
    global debug ip port EXIT_MSG
 
    set EXIT_MSG $msg
    if { [ info exists ip ] && [ info exists port ] } { 
	set EXIT_MSG "[ info script ]:$ip:$port: $EXIT_MSG "
    }  
    if { [ info exists debug ] && $debug } { 
	puts $EXIT_MSG
    } 
} 
 
#-------------------------------------------
# main 
#-------------------------------------------
 
ace_debug "initializing varaible"
set EXIT_MSG "Error config:  script SSH_PROBE  <debug(0|1)>"
 
set ip $scriptprobe_env(realIP) 
set port $scriptprobe_env(realPort)
 
## if port is 0 , use default port 22
if { $port == 0 } {
    set port 22
} 
set debug [ lindex $argv 0 ]
if { $debug == "" } {
    set debug 0
} 
# open connection 
ace_debug "opening socket"
set sock [ socket $ip $port ]
 
ace_debug "setting fconfigure to binary"
fconfigure $sock -translation binary 
 
ace_debug "sending ssh client hand-shake message"
# Sending SSH-2.0-SecureCRT_6.5.0 (build 335) SecureCRT??
set ssh_hello "5353482d322e302d5365637572654352545f362e352e3020286275696c642033333529205365637572654352540d0a"
 
set ssh_length  [ string length $ssh_hello ]
puts -nonewline $sock [ binary format "H${ssh_length}" $ssh_hello ]
flush $sock
 
#  read frist 100 bytes from server
ace_debug "receiving response"
set lines [ read $sock 100 ]
 
#  close connection
ace_debug "closing socket"
close $sock
 
#  parsing the 1st 3 bytes from the ssh headers 
#  if it is not a ssh hand shake successful message. failed the probe with exit 30002
# If the server responds with its SSH info then it must be alive
set ssh_header "SSH"
 
ace_debug $lines
 
if { ![ binary scan $lines "@0a3" res ] } { 
    ace_debug "probe fail : ssh server response parsing failure"
    exit 30002
} 
ace_debug $res
if { $res != $ssh_header } { 
    ace_debug "probe fail : ssh hand shake failure with $res !"
    exit 30002
} 
 
#  Everything went fine. probe exit with success exit_code 30001
ace_debug "probe success"
exit 30001

“As Cloud Backups are done over the public Internet, their performance is highly
dependent on Internet network throughput – typically less than 1 MB/Sec per
connection. Additionally, Cloud vendors may also throttle sessions to prevent
individual users from consuming disproportionate amounts of resources.
According to internal tests conducted at Oracle, Amazon S3 limits an individual
session’s read/write throughput to around 2-3 MB/Sec. However by using the right
Oracle Database Backup in the Cloud Page 9
combination of parallelism and compression, backup speeds of up to 40-50
MB/Sec were attained. ”

Plenty fast for a great offsite backup solution! Can get a little pricy for terabytes of data, but a cheap for 100’s of gigs. May be a good solution for people in need of off site backups.

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import java.util.Date;
class st{
	public static void main(String args[]){
		// Test the + operator. We know this one is bad.
		// Its good to know its still bad in Java6
		long t = new Date().getTime();
		String x="";
		for(int i=0;i<100000;i++)
			x = x + " ";
		long e = new Date().getTime();
		System.out.println("Time to use the + operations on a string: " + (e-t));
 
		// Test the String.concat method. 
		// Is it any faster?
		t=new Date().getTime();
		x="";
		for(int i=0;i<100000;i++)
			x = x.concat(" ");
		e=new Date().getTime();
		System.out.println("Time to use the concat method on a string: " + (e-t));
 
		// Finaly out baseline. We know StringBuilder is(was)
		// the fastest way to build Strings.
		t=new Date().getTime();
		StringBuilder sb = new StringBuilder();
		for(int i=0;i<100000;i++)
			sb.append(" ");
		String xx=sb.toString();
		e=new Date().getTime();
		System.out.println("Time to use a StringBuilder object: " + (e-t));
	}
}

And the results are!

abc:~ def$ java -version
java version "1.6.0_15"
Java(TM) SE Runtime Environment (build 1.6.0_15-b03-219)
Java HotSpot(TM) 64-Bit Server VM (build 14.1-b02-90, mixed mode)
abc:~ def$ javac st.java
abc:~ def$ java st
Time to use the + operations on a string: 29464
Time to use the concat method on a string: 7075
Time to use a StringBuilder object: 2
abc:~ def$

So, what did we learn?

1. Download the cx_Oracle library.
wget http://prdownloads.sourceforge.net/cx-oracle/cx_Oracle-4.3.1-10g-py23-1.i386.rpm?download

2. Install cx_Oracle
rpm -i cx_Oracle-4.3.1-10g-py23-1.i386.rpm

3. Download Oracle Instant Client from the URL below. Must be logged in so do this from a browser.

http://download.oracle.com/otn/linux/instantclient/10204/oracle-instantclient-basiclite-10.2.0.4-1.i386.rpm

4. Install Oracle Instant Client
rpm -i oracle-instantclient-basic-10.2.0.4-1.i386.rpm

5. Add the path to the instant client libs to LD_LIBRARY_PATH.
echo “export LD_LIBRARY_PATH=/usr/lib/oracle/10.2.0.4/client/lib/:\$LD_LIBRARY_PATH” >> /etc/profile

Thats it! Want to be sure?

[xyz@pdq ~]$ python2
Python 2.3.4 (#1, Jul 16 2009, 07:01:37)
[GCC 3.4.6 20060404 (Red Hat 3.4.6-11)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cx_Oracle
>>> oraConn=cx_Oracle.Connection("username/password@server/SqlNetAlias")
>>> curs = oraConn.cursor()
>>> curs.execute("select 1 from dual")
[]
>>> rows = curs.fetchmany(curs.arraysize)
>>> for row in rows:
... print row[0]
...
1
>>> oraConn.close()
>>>

The more I learn about cx_Oracle and Python I will try to update this space. All I know right now is that it is FAST!

Below is my new GPG key for Chris.Greenough@nau.edu. All other keys for this email have expired. All other GPG/PGP keys should be ignored. While I was at it I also added a GPG key for Chris@ChrisGreenough.com.

Chris.Greenough@nau.edu

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Chris.Greenough@nau.edu GPG Public Key ID 41F1608F

Chris@ChrisGreenough.com

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1. Click the Bluetooth icon in the task bar.
2. Go to add device
3. If you device is discoverable you should see it listed, right click and go to properties
4. Put a check in the box next to Mouse, keyboard drivers (Something like that).
5. Continue to add as normal.

Hope that help some other people! It drove me crazy!

I just happened to have my Camera on me and a photographer bailed so I decided to try to get everyone coming by the aid station. Let me know what you think! Chris@ChrisGreenough.com

All of the pictures are also on my Flickr account.

And you can also get all the pictures in a zip format here.