Category Archives: Oracle

ORACLE TUTORIALS

Oracle is most widely used Oracle database in the world. It has the capacity to handle large database and high transaction

Here I am presenting the Oracle tutorials on Various Oracle products

  1. Oracle database
  2. Oracle sql/plsql
  3. Oracle application
  4. Weblogic
  5. Performance tuning.

These articles will be  really help in understanding the oracle products and getting started on Oracle system

Oracle Enqueue and locks(Oracle table locks): How it works

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Enqueue and locks

Oracle database is the widely used database in industry .Here I am trying to explains  about oracle locks Topics Covered What is Oracle Enqueue and locks What is Enqueue identifier? What is Enqueue resource? How is the lookup done in Resource table? How is Enqueue operations works? How is the queue checked when lock is release or converted Common Types of Enqueue Views and Table … Continue reading Oracle Enqueue and locks(Oracle table locks): How it works »

Coalesce Function in Oracle

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Last updated on October 30th, 2018 at 04:28 amCoalesce Function is a useful function in oracle and it is very useful when we want to return first non null values in the list expr1 : This is returned if it is not null expr2: This is returned if it is not null and first expression is null exprn: This is returned if the preceding expression … Continue reading Coalesce Function in Oracle »

NVL2 function in Oracle

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Last updated on October 30th, 2018 at 04:33 amNVL2 function is a nesting function .It examines the first impression, if the the first impression is not null ,then NVL2 function returns the second expression. if the first impression is null, then it return the third expression. expr1: it is the source values or expression which may contain null. You can provide column name,function on the … Continue reading NVL2 function in Oracle »

NVL function in Oracle

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NVL function is a nesting function which is used to substitute null values with certain values In the above syntax expr1 : it is the source values or expression which may contain null. You can provide column name,function on the column name expr2 : It is the target value which will be placed in case null is returned from expr1 If expr1 is null, then … Continue reading NVL function in Oracle »

Update statement in oracle

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Update statement in oracle is used to update the existing rows in the table. It is a DML statement. DML stand data manipulation language. We can use this statement to update specific rows ,set of rows or all rows in the table. Syntax is given below Table : It is the table name which need to be updated column : it is the single column … Continue reading Update statement in oracle »

Unable To Authenticate Session in R12

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Unable To Authenticate Session or Unable to create session is one of the most common errors in R12 instance ERROR ———————– “Unable to authenticate session” This can happen after the instance is cloned or any changes happened to the system with wrong parameter The first log which you should check in case of this error is $INST_TOP/logs/ora/10.1.3/j2ee/oacore/oacore_default_group_1/application.log Here are some common errors which you might … Continue reading Unable To Authenticate Session in R12 »

Helpful queries for Oracle Apps

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How to compile the package,package body ,procedures alter package <package name > compile; alter package <package name > compile body; alter procedure <procedure name > compile; If it is not successfully compiled, we can look at the errors from the below sql Login to SQL*Plus. SELECT text FROM dba_errors WHERE name = packagename; The output will look something like this. TEXT ——————————————————————— PLS-00302: component ‘XYZ’ … Continue reading Helpful queries for Oracle Apps »

How to assign User management Responsibility to user in R12

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You may need sometimes to assign User management responsibility to the users in EBS R12 Steps to assign the responsibility are Open Define User form Look for the user which need to assigned the responsibility by typing user name in username column and pressing F11 Assign the user management responsibility to the user and Press Save Now User should be  able to see the responsibility … Continue reading How to assign User management Responsibility to user in R12 »

How to install SSH on Ubuntu

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SSH is nice tool to connect to the server. it encrypts all traffic to eliminate eavesdropping, connection hijacking, and other attacks. I will be giving the steps for installing that on Ubuntu OS Step 1: First check if it is already running ps -ef |grep -i SSH Step 2:  Now install the SSH using the command sudo apt-get install openssh-server -y Here are some issue … Continue reading How to install SSH on Ubuntu »

how to start and stop httpd service

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Apache is the HTTP server which is freely available over internet. it is widely used on Linux distribution to host websites.  Apache configuration is managed by the configuration file httpd.conf. You can use locate command to find the configuration  file $ locate httpd.conf /etc/httpd/conf/httpd.conf After making the change , you need to restart the Apache services to make it effective Command for  Linux version 4.x/5.x/6.x … Continue reading how to start and stop httpd service »