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In computing and telecommunications, downtime (also (system) outage or (system) drought colloquially) is a period when a system is unavailable. The unavailability is the proportion of a time-span that a system is unavailable or offline .
The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state. [26] 504 Gateway Timeout The server was acting as a gateway or proxy and did not receive a timely response from the upstream server. 505 HTTP Version Not Supported The server does not support the HTTP version used in ...
Such systems constitute an important aspect of modern Web applications. [3] The widespread adoption of notification systems was a major technological development of the 20th century. A notification is a combination of software, hardware, and psychology that provides a means of delivering a message to a group of recipients.
For example, a system can be "up" with its services not "available" in the case of a network outage. Or a system undergoing software maintenance can be "available" to be worked on by a system administrator, but its services do not appear "up" to the end user or customer. The subject of the terms is thus important here: whether the focus of a ...
NFC—Near-field communication; NFS—Network File System; NGL—aNGeL; NGSCB—Next-Generation Secure Computing Base; NI—National Instruments; NIC—Network Interface Controller or Network Interface Card; NIM—No Internal Message; NIO—Non-blocking I/O; NIST—National Institute of Standards and Technology; NLE—Non-Linear Editing system
In organizational management, mean down time (MDT) is the average time that a system is non-operational. This includes all downtime associated with repair , corrective and preventive maintenance , self-imposed downtime , and any logistics or administrative delays.
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In computer science, a heartbeat is a periodic signal generated by hardware or software to indicate normal operation or to synchronize other parts of a computer system. [1] [2] Heartbeat mechanism is one of the common techniques in mission critical systems for providing high availability and fault tolerance of network services by detecting the network or systems failures of nodes or daemons ...