Differentiate between conventional database and real time database - difference between real-time database and conventional database.
Difference between conventional and
real-time databases
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Conventional Database
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Real-Time Database
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Data
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Nature of Data
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Persistent data
(values do not become obsolete)
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Persistent + Temporal
data (values may become obsolete if deadline is missed)
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Data items
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Static data items
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Dynamic data
items (Data items that reflect the state of the environment)
Static data items
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Data validity
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Consistent
transactions maintain valid data in databases
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Data validity is
highly depend on the time
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Transactions
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Correctness
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Logically correct
and consistent
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Logically correct
and consistent
Approximately
correct
Time correctness
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Timing constraints
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No timing
constraints
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Timing constraints
to be followed
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Consistency
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Logical Consistency
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Logical
consistency
External
consistency
Temporal consistency
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Response time
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To be minimized
to handle more transactions.
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Response time
requirements come from external world
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ACID properties
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Must be satisfied
for every transaction
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May be relaxed in
few cases
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Performance
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Performance
metric
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Number of
transactions completed per unit time
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Number of
transactions missing their deadlines per unit time
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