For customers who can afford a relatively short term of database instance unavailability, scheduling downtimes at the time of week with the possible lowest impact could be an acceptable compromise.
Abstract: In this paper, Formula of MTTR( meam time to repair) and unavailability of every states for series repairable system are given using Markov processes.
文摘：利用马尔可夫过程给出了串联可修系统各状态的不可用度表达式及平均修复时间表达式。
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Many cases had to be proponed due to the unavailability of the court rooms, both the clients and lawyers suffered due to time lost, some cases are delayed and without longer period of detailed trial.