DEFINITION In contrast to transaction aborts, a crash is typically a major failure by which the state of the current database is lost or parts of storage media are unrecoverable (destroyed). Based on log data from a stable log, also called temporary log file, and the inconsistent and/or outdated state of the permanent database, system recovery has to reconstruct the most recent transaction-cons...

We propose a redundancy management mechanism for peer-to-peer backup applications. Since, in a backup system, data is read over the network only during restore processes caused by data loss, redundancy management targets data durability rather than attempting to make each piece of information availabile at any time. Each peer determines, in an on-line manner, an amount of redundancy sufficient ...

Imagine having to prove everything you believe at one time. That is exactly what happened when I was asked to change the design of an Enterprise Backup System to accommodate the backup and restore needs of a new, very large system. To meet the challenge, I’d have to use three brand-new pieces of technology and push my chosen backup software to its limits. Would I be able to send that much data ...

This paper considers replacement polices for an extended cumulative damage model with minimal maintenance at each shock and minimal repair at failure: A system is replaced at time T or at shock number N , and undergoes maintenance or repair between replacements. The expected cost rate is obtained and each optimal T ∗ and N∗ to minimize the cost rate is discussed. It is shown that this model wou...

With the ever-growing amount of data, the network bandwidth requirement has increased greatly in Remote Backup System. The network bandwidth became the bottleneck of the whole system. The paper describes the Remote Backup System using Hash to identify and avoid sending duplicate data blocks between the Primary Node and the Secondary Node, thereby, to reduce the data replication network bandwidt...

The increased use of virtual machines in the enterprise environment presents an interesting new set of challenges for the administrators of today’s information systems. In addition to the management of the sheer volume of easily-created new data on physical machines, VMs themselves contain data that is important to the user of the virtual machine. Efficient storage, transmission, and backup of ...

In order to evaluate the performance and estimate the resource usage of peer-to-peer backup systems, it is important to analyze the time they spend in storing, retrieving and keeping the redundancy of the stored files. The analysis of such systems is difficult due to the random behavior of the peers and the variations of network conditions. Simulations provide a unique means for reproducing suc...

Penggunaan perangkat jaringan router modem wireless saat ini sudah tidak terlalu dibutuhkan, dikarenakan banyak sekali tempat-tempat umum, atau tempat area istirahat menyediakan koneksi internet yang berupa wifi (Wireless Fidelity) disebut dengan hotspot gartis. Jumlah gratis disediakan oleh Pemprov DKI tersebar di 4.956 titik. Teknologi mobile ke arah sebuah smartphone dan bukan lagi Laptop, k...

The Oracle RDBMS recently introduced an innovative compression technique for reducing the size of relational tables. By using a compression algorithm specifically designed for relational data, Oracle is able to compress data much more effectively than standard compression techniques. More significantly, unlike other compression techniques, Oracle incurs virtually no performance penalty for SQL ...