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Define two-phase locking protocol.
Ans: Two-phase locking is significance in the context of ensuring that schedules are serializable. The two-phase locking protocol defines a process each transaction follows.
The two-phase locking protocol
1. Previous to operating on any row, a transaction must obtain a lock on that row.
2. After releasing a lock, a transaction should never obtain any more locks.
List the SQL domain Types? SQL supports the following domain types. 1) Char(n) 2) varchar(n) 3) int 4) numeric(p,d) 5) float(n) 6) date.
Describe Object Relational model ? Object Relational Model - This model combines the characteristics of both relational model and object oriented model. It extends the tradit
The traffic data mgmt. systems infrastructure plan describes the software, hardware, data network, and other elements that will support the TDMS. The infrastructure plan is based o
Serialisable Schedules: If the processes of two transactions conflict with each other, how to verify that no concurrency related problems have happened? For this, serialisability t
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
Define lock? Lock is the most common used to execute the requirement is to permit a transaction to access a data item only if it is currently holding a lock on that item.
differences between a classified catalog and a dictionary catalog
Problem: (a) Data mining is one of the best ways to analyse data and using software techniques, hidden and unexpected patterns and relationships in sets of data can be extrac
Need a sample of a clinic database relationships
It can be easily defined as: The database must not have any unmatched foreign key values. The term "unmatched foreign key value" means a foreign key value for which there doe
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