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Explain Two phase locking protocol
A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the transaction. Such type of transaction can be divided into two phases: and expanding or growing (first) phase, throughout which new locks on items can be acquired but none can be released; and a shrinking (second) phase, throughout which existing locks can be released but no new locks can be obtained. This two-phase protocol can make sure the serializability because all the data items needed by a transaction will be locked at the starting of the transaction and if other transaction needs to use those data items then it has to wait till they become unlocked.
Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
List out various user authorization to modify the database schema. a) Index authorization b) Resource authorization c) Alteration authorization d) Drop authorizat
in case of functional dependencies how we get the higher normal form.
Explain the Natural join Natural join is a binary operator which is written as (R* S) in which R and S are relations. The effect of the natural join is the set of all combinati
Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
please give me introduction to full data in D B M S in a short assignment
Emergence of Client Server Architecture Some of the pioneering work that was completed by some of the relational database vendors permitted the computing to be distributed on m
What are the advantages of creating a table from existing table?
intent locking
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
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