Essay on High Availability Database System

Ensure that the uptime, performance, resources, and security of the computers he or she manages to meet the needs of the users, without exceeding the budget responsible for the integrity of the data and the efficiency and performance of the system

Reliability refers to system live time, that is, system is running efficiently most of the time. Availability is the probability that the system is continuously available (usable or accessible) during a time interval.

The reliability of a system can be improved through the introduction of redundancy in the system. Some of the examples of redundancy in the operation are as below:

A calculation of the average cost of each data loss incident must take into account both possibilities. The ability to recover data depends on the cause of the data loss episode (Smith, 2003).

First off to start the assignment only requires writing about four different types of failures that can happen on a distributed system, however there are many more than just four types of failures that can happen and they are all important to learn about if you are going to work with a distributed system so that you know how to deal with and handle each one of them.

Information will only have value if customers can access it at the right times. Availability can be affected by system errors, and malicious attacks as well as infrastructure problems. Availability is ensured by maintaining hardware as well as repairing hardware immediately when need arise. A correct functioning operating system should also be maintained in the environment free of software conflicts. Adequate communication bandwidth should also be addressed as well as preventing bottlenecks from occurrence.

Availability keeps data and resources available for authorized use, especially during emergencies or disasters. This policy will address common challenges to availability. Denial of Service this is due to intentional attacks or because of undiscovered flaws in implementation. The policy will address loss of information system capabilities because of natural disasters. The policy will also focus on equipment failures during normal use.

In the event of disruption to the Network infrastructure, this plan describes the strategy and procedures for recovering vital information systems, records, and data.

A disaster is defined as a sudden, unplanned catastrophic event that renders the organizations ability to perform mission-critical and critical processes, including the ability to do normal production processing of systems that support critical business processes. A disaster could be the result of significant damage to a portion of the operations, a total loss of a facility, or the inability of the employees to access that facility. The disaster recovery process consists of defining rules, processes,

Hot site is the solution to provide immediate recovery, so it is called mirrors of the datacenter infrastructure (Aparicio, 2011). Furthermore, recovery of data and applications is done through a fully redundant data center configuration. Hot site can be done continuously, so it allows to employees to continue with operations (Aparicio, 2011). Hot site should be included hardware, software, network, and internet connection. Data backup and replication to hot site is done in a regular basis, so that it can be made completely operational in a minimum time after a disaster. To avoid any disaster effect on hot site, it should be located far from the original site (Aparicio, 2011).

High security, dual back-up systems will be in place to guarantee redundancy and lessen the wait time of the recovery.

System Availability: No one wants to hear that a small maintenance fix will require a system outage to implement. People expect seamless implementation of minor fixes and enhancements. System outages are acceptable when major functionality is being implemented. A good design and implementation in place will allow for maximum uptime. From a software perspective – strive for the ability to deploy components of a system (loose coupling) as opposed to an entire recompiled system. From an implementation perspective – strive to have load balanced servers in place running your application. If need be, this will allow you to gracefully remove one server from the load balancer for deployment while the other server(s) continue to service incoming requests. If your system has overnight processing that requires the database to be locked down from updates and inserts at times – implementing a “batch mode” to allow your

Now a day’s Information Technology plays an important role in every field whether it is in big Multinational companies, or in Hospital or in school, colleges, bank etc. It is having a wide range. Every field is now a system oriented where each and every person should have knowledge of basic computer. Information technologies also important to beat the competition in various industries. In our survey report we are going to survey and test the reliability of hardware, networks and software in information technology field. Information technology is a combination of Hardware, software and Networks. It is an combining of technology, users and

The Project is based on the real life scenario. Generally company having their own database server in which the important data is stored.In some times due to some problem like corruption, instance crease, hardware problem so in such cases it is difficult to recover the data from server so we are going to create project which is Fast Start Fail Over.

Availability: Ensuring that systems and data are accessible to authorized users when they need it.