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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.
Explain the Cascadeless Schedule A cascadeless schedule is one in which for every pair of transactions Ti and Tj like that Tj reads a data item before written by Ti, the commit
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
definition and its work
properties of derirable decomposition
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
Need for Multiple Access Paths In practice, most of the online information systems need the support of multi-key files. For example, consider a banking database application hav
Explain Record Based Logical Models? Record-Based logical Models: Also define data at the conceptual and view levels. Unlike object-oriented models, are used to state overall
discuss the purpose of the concurrency control?
Properties of a Transaction A transaction has four main properties. These are: Atomicity Consistency Isolation or Independence Durability or Permanen
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
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