JVM Caching :-

Cache is simply a copy or pre-fetched date stored away from the original data, there are few well known computing caches hits us as bellow
# Oracle Database Buffer Cache of the SGA
# Disk Cache
# CPU Cache
# Web Cache
and in this scenario it is Java Cache.
Similarly data from EBS database is stored or cached […]

Popularity: 8% [?]

read more from this topic.....

If you are upgrading your system (or planning to upgrade) to ATG roll up 4, 5 or 6 or using R12 (12.0.X to 12.1.X); beware of below common intermittent issues around Web Server (Apache/Jserv/OC4J/JVM) for 11.5.10 and R12 
 
- Responsibility not visible to users 
-NoCalssDef found error in JVM logs
-Intermittent hang in JVM (Jserv/Apache)
-Intermittent page not found while accessing/login apps ( 500 […]

Popularity: 9% [?]

read more from this topic.....

This post covers broad level steps to introduce additional middle/application tier to accommodate more application users or for resilience.
    This document is based on Rapid Clone to add new Application Tier/Node.
.
Top Level Steps
1. Run Rapid Clone (preclone) on existing middle tier Node;
perl adpreclone.pl appsTier
2. Copy middle tier file system from existing middle tier node to target middle […]

Popularity: 9% [?]

read more from this topic.....

This post covers step by step upgrade of Oracle Database from version 10g (10.2.0.1) to 11g R1 (11.1.0.6) on Unix. You can use this document (with few additional steps mentioned in upgrade guide) to upgrade from 9i or for database on Windows Operating System.
.
Important points before you start 11g upgrade

1. Read Chapter 1, 2 & […]

Popularity: 16% [?]

read more from this topic.....

Turn on Logging

In order to know, which listener commands were executing, one should enable the logging by the following:
LSNRCTL> set log_directory  …/log
LSNRCTL> set log_file Listener_<sid name>.log
LSNRCTL> set log_status on LSNRCTL> save_config

Set the Listener Password

Setting Listener Password is strongly recommended in order to prevent the distinct attacks. There are two ways to do the […]

Popularity: 7% [?]

read more from this topic.....

NOTE: Always Do Exercise on Test Environment, First. 
Assumptions : 
1. ASM Instance is already Created and Ready to Use.
2. DB Instance was Started using ‘spfile’
3. Disk Group Name : ‘+DGDATA’ 
- Set the Parameter ‘db_create_file_dest’ to ‘+DGDATA’  
alter system set db_create_file_dest=’+DGDATA’ scope=spfile;
- Set the Parameter ‘control_file’ to the destination in ASM
alter system set control_files=” scope=spfile;
 - […]

Popularity: 7% [?]

read more from this topic.....

There are some good notes on JVM tuning from Mike Shaw on Steven Chan’s blog  here , here and here and some good Metalink notes at end of this post.
                     Important thing missing from all these notes (for some one like me who is new to Java) is basics of Garbage Collection, Generation and how to read […]

Popularity: 8% [?]

read more from this topic.....