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What are two special events?
The two special events are as "entry" and "exit". Any action which is marked as linked to entry event is executed whenever given state is entered via transition. The action associated with exit event is executed every time the state is left via transition.
notes about update opreation
The Concurrent Transactions Almost every commercial DBMS support multi-user environment. Therefore, allowing multiple transactions to proceed concurrently. The DBMS must make
random file orgnization
Describe Hashing in DBMS? Hashing: Hashing is a technique to store data within an array so which storing, searching, inserting and deleting data is fast (in theory it's O(1))
Exclusive lock It is asked for by a transaction on a data item that it wants to update. No other transaction can put either a shared lock or an exclusive lock on a dat
Define blocks? The database system resides eternally on non-volatile storage, and is into fixed-length storage units known as blocks.
Primary index A primary index is a file that has a sorted series of records having two columns: a block address for that key field in the data file; and the ordering key field.
a. Define the term "deadlock". There are four conditions that must hold before deadlock is possible. Name them. b. Outline an algorithm that detects whether there is a deadlock.
What is multiplicity in the associations? Give an example to explain multiplicity? Multiplicity in association indicate number of objects participate in any relationship. For
Hi I have got an assignment for making an er diagram for market management software can any budy help me?
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