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What are the time stamps associated with each data item?
W-timestamp (Q) denotes the largest time stamp if any transaction that implemented WRITE (Q) successfully.
R-timestamp (Q) denotes the largest time stamp if any transaction that implemented READ (Q) successfully.
Database Manager It is the interface among low-level data, queries and application programs. Databases typically need a large amount of storage space. It is kept on disks, as
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
how draw er diagram
write a short note on participation role? Participation role: roles are indicating in E-R diagram by labelling the lines that connect diamonds to rectangles.
what is attribute is attribute inheritance in dbms?
data models are being replaced over years. Reasons and why does that happen?
Define physical image of a global relation at a site
#question.what is mapping constraints and types?.
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
What is recursive closure? Why is it not possible to describe this operation in relational algebra? Recursive closure is applied to recursive relationship. An instance of rec
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