What aspects should be considered when determining the transaction isolation level in database management systems?

When choosing the transaction isolation level in a DBMS, it is important to consider the balance between data integrity and performance.

Main aspects:

• Isolation issues: dirty read, non-repeatable read, phantom read.
• Isolation levels: Read Uncommitted, Read Committed, Repeatable Read, Serializable.
• Consistency requirements: how critical it is to avoid read anomalies.
• Performance: stricter isolation levels can reduce concurrency and increase locking.
• Application features: for example, financial operations require maximum isolation, while analytics may suffice with a lower level.

Choosing an isolation level is a compromise between data reliability and system speed.