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Lock Based Protocol
A lock is nothing but a mechanism that tells the DBMS whether a particular data item is being used by any transaction for read/write purpose. As there are two types of operations, i.e. read and write, whose basic nature are dissimilar, the locks for read and write operation might be behave differently.
Read operation performed by dissimilar transactions on the same data item poses less of a challenge. The value of the data item, if constant, can be read by any number of transactions at any given time.
1 NF Normal Form The domain of attribute must add only atomic (simple, indivisible) values First normal form (Minimal Form or 1NF) is a normal form need in database normalizat
write-set(T): Each data items that are written by a transaction T
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
sy bcs project of hospital managment system
In a relation, tuples are not inserted in any definite order. Ordering of tuples is not defined as a part of a relation definition. Though, records may be structured later accordin
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
What are the two types of serializability? The two types of serializability is a) Conflict serializability b) View serializability
what is the importance of back up files
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let us consider a table having 2200 records and the fixed size of the table to be considered as 25.then how many numbers of table is requredto perform horizontal fragmentation
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