What is concurrency in DB2?

Concurrency is the process in which more than one application can access the similar data at same time.

Concurrency in DB2 refers to the ability of multiple transactions to execute concurrently without interfering with each other. It involves managing access to shared resources, such as database tables, in a way that ensures data consistency and integrity.

DB2 uses various mechanisms to handle concurrency, including locks and isolation levels. Locks are used to control access to data, preventing multiple transactions from modifying the same data simultaneously, which could lead to conflicts and data inconsistency.

Isolation levels define the degree to which one transaction is isolated from the effects of other concurrent transactions. DB2 supports different isolation levels, such as Read Uncommitted, Read Committed, Repeatable Read, and Serializable, each offering a different balance between concurrency and data consistency.

In summary, concurrency in DB2 involves managing simultaneous access to data by multiple transactions to ensure data integrity and consistency. It is achieved through mechanisms like locks and isolation levels.