Historian Gossary

20 Words we need to be a historian terms

I made it because be a historian is one of my dream jobs but I'm not sure if I were that.

Active image
The active image is an allocation of memory in which copies of values of acquired data are held to service client requests faster. The active image typically holds either the last 65 values for each data point or the number of values required to hold one minute of data, plus 10 percent. String tags configured with a length greater than 64 characters are not held in the active image.
Alarm
An alarm warns an operator about a process condition that could potentially cause a problem. Typically an alarm is set up to be triggered when a process value exceeds a defined limit. Alarms are detected by InTouch or AVEVA Application Server and recorded by AVEVA Historian's Alarm & Event History system.
Alternate storage location
The alternate storage location is a directory on a computer that is used to store files that have been moved out of the circular storage location.
annotation
An annotation is a user comment about a tag at a point in time.
architecture
A system's architecture describes the structure of a computer system, including the hardware and software that link the computers on a network.
archiving
Archiving is the process of removing records from the system and saving them to files so they can be restored later if needed. Alarm and event history stored in a SQL Server database may be archived using the Purge/Archive utility. Process history stored in history blocks can be archived and restored using Windows Explorer.
argument
An argument is the actual value passed to a function parameter.
authentication
Authentication is the process by which the logon information for a user is validated. Authentication is typically performed by a server on the network domain by comparing the logon information to an authorized list.
back end
Back end is a term that refers to the server in a client/server architecture. Data retrieval, processing, and storage occur at the back end, or server. See also server
bandwidth
Bandwidth relates to the amount of data that can be transferred across a computer network in a given amount of time. Bandwidth is usually expressed in bits per second (bps) or baud.
browser
A browser is a graphical representation of hierarchical groups of data. A browser is used to display disk directories, folders, or files. For example, the System Management Console uses a browser to display servers, tags, and groups of tags in the system, private, and public namespaces. See also namespace.
byte
A byte is a unit of information that consists of 8 bits. For data storage, a byte is equal to a single character, such as a number or a letter
configuration tables
Configuration tables contain information that defines most of the configuration aspects of AVEVA Historian. For example, definitions for tags, I/O Servers, and users are stored in configuration tables. See also extension table.
contex
Meaningful description of the event or grouping to which a group of limits, rates of change, or deviations can belong. Examples are "Normal Operation," "Cold Shutdown," "My Personal Concerns."
detector
An event detector is a mechanism for determining when the set of event criteria within the system has been satisfied for history data. See also event tag, action
domain
A domain is a group of computers that share a tree or subtree of a network for security authentication.
event
An event is a historical occurrence of a defined activity in the system. The definition for an event is stored as an event tag. Events are detected by event detectors and may be responded to by an event action. See also detector, action, event tag.
failover
Failover is the process of substituting a backup resource, such as an IDAS, for a resource that is no longer functioning.
front end
Front end is a term that refers to the client in a client/server architecture. Database access or data input occurs at the front end, or client.
function
A function is a procedure in programming language.