The oracle database is a centralized repository where data is stored. The Oracle database has a physical structure that is visible to the operating system and is made up of the Operating system’s files and logical structure that is recognized by the oracle server. The user while requesting any request any information from oracle database, … Read more
The concurrency control technique is a process of managing the simultaneous execution of transactions in a shared database. However, when the concurrent transaction techniques are executed in an uncontrolled manner then it leads to several problems. The five leading problems that occur due to uncontrolled execution of concurrent transactions are 1. Lost Update Problem 2. … Read more
Lost update and dirty read problem both are issues that appear due to uncontrolled execution of the concurrent transaction. Lost Update Problem A lost update problem appears when at least two transactions access the same transaction data and performs their operation. As we know, the data of transaction if the first read by the system … Read more
Concurrency control is a method of managing multiple transactions or operations that are running simultaneously. It occurs in the multiuser system, where more than one user executes some transaction at the same time. Executing any transaction simultaneously will lead to inefficient system performance, very high waiting time and response time, and decrease resource utilization without … Read more
Atomicity It states that a transaction must be treated as a single atomic unit i.e. Either transaction executed successfully or completely failed. It should not stuck in between or execute partially. The states of the transaction should be defined before execution or after the execution or failure or abortion of the transaction. For example: Suppose … Read more
