Home > Ask the Oracle Database / Applications Experts > Oracle database design and architecture Questions & Answers > ORA-27123 after installation
Ask The Oracle Expert: Questions & Answers
EMAIL THIS

ORA-27123 after installation

Brian Peasland EXPERT RESPONSE FROM: Brian Peasland

Pose a Question
Other Oracle Categories
Meet all Oracle Experts
Become an Expert for this site


Oracle tips, scripts, and expert advice
Digg This!    StumbleUpon Toolbar StumbleUpon    Bookmark with Delicious Del.icio.us    Add to Google


>
QUESTION POSED ON: 20 February 2006
When I installed Oracle 9i (9.2.0.1.0) on Redhat Linux (AS 3), the installation went OK. But when the DBCA started to create the database, the error message "ORA-27123: unable to attach to shared memory segment" was produced. I cannot have any database installed in my machine. I really do not know what is wrong. Your help will be greatly appreciated.


Digg This!    StumbleUpon Toolbar StumbleUpon    Bookmark with Delicious Del.icio.us    Add to Google



RELATED CONTENT
Oracle database design and architecture
How to use V$SEGMENT_STATISTICS to find the most accessed Oracle table
Can I install an Oracle client on Windows 7?
How to use the Oracle Database Upgrade Assistant (DBUA)
Can I specify Oracle column order in my database table?
Can I have a single Oracle 11g RAC instance across multiple databases?
How to use the Oracle export utility to duplicate database structure
How to choose the primary key columns in an Oracle table
Understanding the data archiving definition
How to plan Oracle Grid Control Repository maintenance
What Linux flavor should I use for my Linux proof of concept in Oracle?

Oracle database design and architecture
How to use V$SEGMENT_STATISTICS to find the most accessed Oracle table
Can I install an Oracle client on Windows 7?
How to use the Oracle Database Upgrade Assistant (DBUA)
Can I specify Oracle column order in my database table?
Can I have a single Oracle 11g RAC instance across multiple databases?
How to use the Oracle export utility to duplicate database structure
How to choose the primary key columns in an Oracle table
Understanding the data archiving definition
Review: Oracle's 11g R2 database has some good and bad
Scaling an Oracle database: What is the best strategy for you?

Oracle error messages
Oracle error 6550 may mean incorrect Oracle export version
Why does the archive log in Oracle give me the ORA-16032 error?
Are we getting the ORA-00382 error because we're at maximum block size?
How do I solve the ORA-00257 error in Oracle?
Solving common Oracle errors guide
Solving common Oracle errors guide
Error during RMAN backup
ORA-12560 error with Oracle 10g Instant Client
Unable to view Oracle tables in NetBeans
IMP-00017 error message with Oracle import

RELATED GLOSSARY TERMS
Terms from Whatis.com − the technology online dictionary
E. F. Codd  (SearchOracle.com)
extent  (SearchOracle.com)
flexfield  (SearchOracle.com)
foreign key  (SearchOracle.com)
multidimensional database  (SearchOracle.com)
object-oriented database management system  (SearchOracle.com)
quad tree  (SearchOracle.com)
relational online analytical processing  (SearchOracle.com)
row  (SearchOracle.com)
splay tree  (SearchOracle.com)

RELATED RESOURCES
2020software.com, trial software downloads for accounting software, ERP software, CRM software and business software systems
Search Bitpipe.com for the latest white papers and business webcasts
Whatis.com, the online computer dictionary


The most common reason for the ORA-27123 error is that you have not correctly configured your kernel to support the Shared Memory Segments that Oracle requires on Unix/Linux platforms. The Oracle Installation Guide fully documents the kernel changes you need to make in order to fix your problem. You can find these steps here.

In the /proc/sys/kernel directory, you'll need to modify the shmmax, shmmni and shmall config files as described in the above documentation.




Search and Browse the Expert Answer Center
Search and browse more than 25,000 question and answer pairs from more than 250 TechTarget industry experts.
Browse our Expert Advice



Oracle White Papers: Fusion Middleware
HomeNewsTopicsTipsAsk the ExpertsMultimediaWhite PapersProductsBlogs
About Us  |  Contact Us  |  For Advertisers  |  For Business Partners  |  Site Index  |  RSS
SEARCH 
TechTarget provides technology professionals with the information they need to perform their jobs - from developing strategy, to making cost-effective purchase decisions and managing their organizations' technology projects - with its network of technology-specific websites, events and online magazines.

TechTarget Corporate Web Site  |  Media Kits  |  Site Map




All Rights Reserved, Copyright 2003 - 2009, TechTarget | Read our Privacy Policy 		  TechTarget - The IT Media ROI Experts