Category Archives: Oracle Database

An Oracle database is a collection of data treated as a unit. The purpose of a database is to store and retrieve related information. A database server is the key to solving the problems of information management.Many companies has implemented their data in Oracle. Most of them are mission critical. So Oracle database concept need to be very clear to manage these mission critical things. At the same time Oracle database needs to deliver high performance also. A database server also prevents unauthorized access and provides efficient solutions for failure recovery.

Below section I have tried to present all the important features in Oracle Database management

How Oracle RAC handles instance failure and recovery

Last updated on August 31st, 2016 at 05:37 pmOracle uses a simple mechanism of a heartbeat to detect instance failure of a node in a RAC cluster. The cluster manager software detects if it cannot receive the heartbeat of the other instances and if it does not the recovery process begins. From what I can find, this heartbeat is provided by the udlm package on … Continue reading How Oracle RAC handles instance failure and recovery »

Oracle Enqueue:Mechanism used to protect shared resource

Last updated on August 24th, 2016 at 06:39 pmThe oracle server uses different type of locks(Enqueue) to prevent concurrent access to the data and to prevent destructive interference between the uses Following types of locks are available in Oracle Server a. Data Manipulation Locks: its protect the data.Table locks protects the entire table while the row lock protect the selected row b.Data Doctionary locks-Its protect … Continue reading Oracle Enqueue:Mechanism used to protect shared resource »