Troubleshooting issues in Oracle, RedHat Linux, Windows and lot more!.

How to find the duplicate records in a table? Query: Simple Table SELECT c1, c2, ... ,cn, count(*) FROM TableName GROUP BY c1, c2,..., cn HAVING count(*) > 1; Table with Joins: SELECT c1, c2, ... ,cn, count(*) FROM TableName1 INNER JOIN TableName2 on TableName1.ColName=TableName2.ColName GROUP BY c1, c2,..., cn HAVING count(*) > 1;

As an Oracle DBA, you can expect to be involved in the following tasks: -          Installing Oracle software -          Creating Oracle databases -          Performing upgrades of the database and software to new release levels -          Starting up and shutting down the database -          Managing the database’s storage structures -          Managing users and security -          Managing schema objects, such as tables, indexes, and views -          Making database backups and performing recovery when necessary -          Proactively monitoring the database’s health and taking preventive or corrective action as required -          Monitoring and tuning performance In a small to midsize database environment, you might be the...

How to retrieve the Local Date and Time in sql server ? A common task in SQL Server is the retrieval of the local date and time from the server. Usually, it is more appropriate for a database-linked application to obtain the time from the server than from the local machine, as this ensures that all users are using the same basis for the time. If a user's local clock is set incorrectly, the use of the server's clock ensures that an invalid date or time is not stored. Using the CURRENT_TIMESTAMP SQL Server defines a value named CURRENT_TIMESTAMP. This value can be included in aquery using a select statement or can be assigned to a DateTime variable to obtain the current local time. To demonstrate, try the following statements using a SQL Server Management Studio query window. The first will output the local time to the results window, the second will hold the time in a variable before printing the variable's value in the messages window. NB: When the current date ...

Ever since SQL Server 2005 was released, each object in a database has belonged to a database schema. SQL Server 2008 has continued with database schemas, and an explanation follows. What is a Database Schema? A database schema is a way to logically group objects such as tables, views, stored procedures etc. Think of a schema as a container of objects. You can assign a user login permissions to a single schema so that the user can only access the objects they are authorized to access. Schemas can be created and altered in a database, and users can be granted access to a schema. A schema can be owned by any user, and schema ownership is transferable. Creating a Database Schema To create a database schema in SQL Server 2008: Navigate to  Security > Schemas Right click on  Schemas  and select  New Schema... . Like this: Complete the details in the  General  tab for the new schema. In this example, the schema name is "person" and the schema o...

In order to set the run oracle SQL*Plus client and the other oracle binaries ORACLE_HOME environment variable path should be set which defines the path of Oracle Home[server] installation directory of the windows server. Follow the below steps to set the ORACLE_HOME path in windows server, c:\> Set ORACLE_HOME= C:\oracle\product\11.2.0\ - where [C:] defines the install drive letter How to check the Oracle environment variable set in windows server ? C:\> echo %ORACLE_HOME% - will display the path of oracle home

How to install SQL Server 2008 R2 ? Applies to: SQL Server 2008 R2 November CTP. An evaluation copy of SQL Server 2008 R2 can be downloaded from  here . If you are upgrading to SQL Server 2008 R2, consider these resources and recommendations: Read about supported upgrade scenarios  here . Download and run SQL Server Upgrade Advisor. Upgrade to the same language version as the existing instance of SQL Server. The following are some recommendations before installing SQL Server 2008 R2: Use NTFS file system. Do no try to install SQL Server 2008 R2 on a compressed drive, because setup will block the installation. Do not install SQL Server on a Domain Controller. Click  here  for more information. Configure your firewall to allow SQL Server access. Click  here  for more information about protocols and port numbers. The user account that is running SQL Server Setup must have administrative privileges on the computer. Verify Windows Manageme...