What reasons make the Repeatable Read isolation level preferable for a user table where each user acts only on their own record?

The Repeatable Read isolation level guarantees that within a single transaction, repeated reads of the same data will not change. For a user table where each user only works with their own record, this ensures:

• No phantom reads and unpredictable data changes, which is important for the consistency of user information.
• Minimal impact on parallelism, as users do not compete for the same records.
• Protection against unintentional conflicts during data updates.

Thus, Repeatable Read provides a balance between data integrity and performance in scenarios where operations are isolated per user.