Your customer has implemented a solution that uses Cloud Spanner and notices some read latency-related performance issues on one table. This table is accessed only by their users using a primary key. The table schema is shown below. You want to resolve the issue. What should you do?
CREATE TABLE Persons (
person_id INT64 NOT NULL, -- sequential number based on number of registration
account_creation_date DATE, -- system date
birthdate DATE, -- customer birthdate
firstname STRING(255), -- first name
lastname STRING(255), -- last name
profile_picture BYTES(255) -- profile picture
) PRIMARY KEY (person_id)