How to fix ORA-12547 TNS lost contact when try to connect to Oracle

November 23, 2012 by 35 Comments 

Issue / Oracle error

sqlplus scott/tiger
SQL*Plus: Release - Production on Wed May 18 09:32:35 2011
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ORA-12547: TNS :lost contact when try to connect to Oracle.

Issue description

I saw that TNS connection issue along with ORA-12547 Oracle error several times, usually when trying to connect to Oracle database server on Unix / Linux host with an OS user that does not belong to oinstall group (Oracle binaries owner group).  In this case, interesting enough that local TNS connection to database (when using tnsnames alias) works fine: Read more »

How to make HP-UX Korn shell similar to Linux Bash

October 26, 2012 by 2 Comments 

Working as Oracle DBA on HP-UX and Linux both I prefer Bash shell which is available on Linux compared to Korn shell which is default shell on HP-UX. It’s more convenient to work on Linux Bash using handy key combinations, etc. Unfortunately Bash is not installed on HP-UX by default and also not officially supported there – you will not get help from HP support if problems with it arise.

Nevertheless, I could find a way of improving environment settings on HP-UX to make the backspace and some other keys work similar to Linux and Bash shell. Read more »

Oracle 11gR2 vs 10gR2 installation on Linux RHEL 5/OEL 5

April 21, 2010 by 2 Comments 

In the last weeks I was involved in a series of Oracle database 10gR2 and 11gR2 server installations on Linux RHEL 5/OEL 5 (x86_64).

Below I will give a quick comparison of the new installation features of Oracle 11gR2 Server to Oracle10gR2.
Read more »

Towards LAMP 2 – Oracle on Linux

December 27, 2009 by 2 Comments 

This article continues my views on Open Source LAMP stack. Below I examine in particular Linux operating system in combination with Oracle database. You can read the previous post here: Towards Open Source, OSS and LAMP.

Linux went further than other “Open Sources” by providing a few popular commercial distributions in the market. If you still do not use Linux in your IT Infrastructure for production middle-ware systems, even on virtualized environments – try it. It works quite well already. Furthermore, nowadays, DBMS runs pretty stable on Linux. Oracle database on OracleVM (virtual machine) is also an option. Read more »

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