Friday Apr 24, 2015

Solaris: ssh to cloud from corporate network

When you are in the office and you want to ssh to IaaS cloud, you may use PuTTy or corkscrew.
When your Oracle Database is running on Solaris and you want to create database link to Oracle Database
on cloud to pull data or push data, there's a better way.  'ssh-http-proxy-connect' command on Solaris.

Synopsis - man pages section 1: User Commands

A proxy command for ssh(1) that uses HTTP CONNECT. Typical use is where connections external to a network are only allowed via a proxy web server.

The example below doesn't create set up any port-forwarding but you can create one to port 1521 in a usual way.

Synopsis - man pages section 1: User Commands

ssh -o ProxyCommand="/usr/lib/ssh/ssh-http-proxy-connect  -h webcache -p 8080 playtime.foo.com 22" playtime.foo.com

 

Wednesday Mar 18, 2015

Re: Exadata X4 vs. X5 DB node CPU comparison

This is a follow-up to my past entry.

Exadata X4 vs. X5 DB node CPU comparison (INOUE Katsumi @ Tokyo)

Now with Database In-Memory, DB node's CPU and memory specs more directly influences DB performance.

Firstly, HW spec is not the only change going from X4-2 -> X5-2.
I heard default kernel parameter is changed which will influence performance.
There may be kernel code change for performance, too.

Secondly, our product manager wrote about related info here.

Do I still need Exadata now that I have Oracle Database In-Memory? (Oracle Database In-Memory)

  • You get a complete fault-tolerant In-Memory solution



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