By using wireless communication technology, when wired network of grassroots station is failure, wireless backup system of meteorological data transmission can automatically switch, and transmit the data at the statio...By using wireless communication technology, when wired network of grassroots station is failure, wireless backup system of meteorological data transmission can automatically switch, and transmit the data at the station with line fault to the destination by short message way. The system has simple operation and low operation cost, and transmission fault of real-time meteorological data due to line problem at the station can be effectively decreased. At present, the system has been tested successfully and put into business operation.展开更多
为了解决数据丢失或损毁,经过对容灾技术的研究,提出基于Oracle Data Guard容灾技术的解决方案,介绍Data Guard容灾技术的工作原理和相关特性,并实现物理备份数据库的构建和角色切换。结果表明,该方案能有效地解决Oracle数据库的数据丢...为了解决数据丢失或损毁,经过对容灾技术的研究,提出基于Oracle Data Guard容灾技术的解决方案,介绍Data Guard容灾技术的工作原理和相关特性,并实现物理备份数据库的构建和角色切换。结果表明,该方案能有效地解决Oracle数据库的数据丢失或损毁问题,为数据的保护提供更有效的保障。展开更多
In this paper, we deal with the problem of improving backup and recovery performance by compressing redundancies in large disk-based backup system. We analyze some general compression algorithms; evaluate their scalab...In this paper, we deal with the problem of improving backup and recovery performance by compressing redundancies in large disk-based backup system. We analyze some general compression algorithms; evaluate their scalability and applicability. We investigate the distribution features of the redundant data in whole system range, and propose a multi-resolution distributed compression algorithm which can discern duplicated data at granularity of file level, block level or byte level to reduce the redundancy in backup environment. In order to accelerate recovery, we propose a synthetic backup solution which stores data in a recovery-oriented way and can compose the final data in back-end backup server. Experiments show that this algorithm can greatly reduce bandwidth consumption, save storage cost, and shorten the backup and recovery time. We implement these technologies in our product, called H-info backup system, which is capable of achieving over 10x compression ratio in both network utilization and data storage during backup.展开更多
文摘By using wireless communication technology, when wired network of grassroots station is failure, wireless backup system of meteorological data transmission can automatically switch, and transmit the data at the station with line fault to the destination by short message way. The system has simple operation and low operation cost, and transmission fault of real-time meteorological data due to line problem at the station can be effectively decreased. At present, the system has been tested successfully and put into business operation.
文摘为了解决数据丢失或损毁,经过对容灾技术的研究,提出基于Oracle Data Guard容灾技术的解决方案,介绍Data Guard容灾技术的工作原理和相关特性,并实现物理备份数据库的构建和角色切换。结果表明,该方案能有效地解决Oracle数据库的数据丢失或损毁问题,为数据的保护提供更有效的保障。
基金Supported by the National Natural Science Foun-dation of China (60473023) the National Innovation Foundationfor Small Technology-Based Firms (04C26214201280)
文摘In this paper, we deal with the problem of improving backup and recovery performance by compressing redundancies in large disk-based backup system. We analyze some general compression algorithms; evaluate their scalability and applicability. We investigate the distribution features of the redundant data in whole system range, and propose a multi-resolution distributed compression algorithm which can discern duplicated data at granularity of file level, block level or byte level to reduce the redundancy in backup environment. In order to accelerate recovery, we propose a synthetic backup solution which stores data in a recovery-oriented way and can compose the final data in back-end backup server. Experiments show that this algorithm can greatly reduce bandwidth consumption, save storage cost, and shorten the backup and recovery time. We implement these technologies in our product, called H-info backup system, which is capable of achieving over 10x compression ratio in both network utilization and data storage during backup.
