To protect against hard drive failures, organizations often use redundant array of inexpensive/independent drives (RAID), in which database updates are replicated to multiple hard drives so that an organization can continue to process database updates after losing one of its hard drives. To protect against electrical power interruptions and outages, organizations use an uninterruptible power supply (UPS), which is a power source such as a battery or fuel cell, for short interruptions and a power generator for longer outages.
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A system may allow multiple computers to share access to data, software, or peripheral devices by running multiple instances of a single, shared database. A parallel database system takes advantage of this architecture to improve performance through parallelization of operations, such as storing data, indexing, and querying. In addition to balancing the workload among CPUs, the parallel database provides for concurrent access to data while protecting data integrity.
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A surety is primarily liable for paying the principal debtor's debt when it is due in a surety arrangement
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