What is the concept of a database transaction?
A database transaction is a logical processing unit in a database management system that includes one or more database access operations. Database transactions, in a nutshell, reflect real-world events in any company.
As the operating system executes multiple transactions in a multiprogramming environment, it's possible that instructions from one transaction will be interleaved with instructions from another.
The term "schedule" refers to the sequential execution sequence of a transaction. A schedule may contain a large number of transactions, each of which contains a set of instructions/tasks.
The next transaction is executed after the first transaction has completed its duration. The transactions are listed in chronological order. Since transactions are performed in sequential order, this type of schedule is known as a serial schedule.
A transaction is a very small piece of software that can include many low-level tasks. In order to ensure precision, completeness, and data integrity, a transaction in a database system must preserve the ACID properties: Atomicity, Consistency, Isolation, and Durability.
Atomicity notes that a transaction must be handled as an atomic entity, meaning that either any or none of its operations must be performed.
Consistency After every transaction, the database must remain consistent. No transaction should have an unfavorable impact on the database's results.
Durability: The database should be able to retain all of its most recent changes even if the server fails or restarts.
The property of isolation states that in a database system where several transactions are being executed concurrently and in parallel, each transaction will be carried out and executed.
The transaction is currently being executed in this state. Every transaction starts out in this state.
Partially Committed A transaction is considered to be partially committed when it completes its final process.
If any of the database recovery system's checks fail, the transaction is said to be in a failed state. A transaction that has failed will no longer be completed.
If any of the checks fails and the transaction enters a failed state, the recovery manager rolls back all of the database's write operations to return the database to its previous state.
A transaction is said to be committed if it completes all of its operations successfully. Many of its ramifications have now been permanently documented in the database system.