4- Storage in the Cloud

Some developers think of Cloud Bigtable as a persistent hashtable. What does that mean? A. Each item in the database consists of exactly the same fields, and can be looked up based on a variety of keys. B. Each item in the database can be sparsely populated, and is looked up with a single key.

B. Each item in the database can be sparsely populated, and is looked up with a single key.

True or false: Cloud Storage is well suited to providing the root file system of a Linux virtual machine. A. True B. False

B. False; Cloud Storage is object storage rather than file storage. Compute Engine virtual machines use Persistent Disk storage to contain their file systems.

True or false: Each table in NoSQL databases such as Cloud Bigtable has a single schema that is enforced by the database engine itself. A. True B. False

B. False; NoSQL databases such as Cloud Bigtable are suitable when all items in the database needn't have their integrity checked by a database schema. Why not? Maybe you want your database items to contain variable fields, or maybe because you simply want your application to manage database integrity.

Why would a customer consider the Coldline storage class? A. To save money on storing frequently accessed data. B. To save money on storing infrequently accessed data. C. To use the Coldline Storage API D. To improve security

B. To save money on storing infrequently accessed data; Data stored in Coldline is billed at a low monthly storage rate, although a fee is assessed on retrievals.

Which database service offers transactional consistency at global scale? A. Cloud SQL B. Cloud Spanner

B. Cloud Spanner

Which database service can scale to higher database sizes? A. Cloud SQL B. Cloud Spanner

B. Cloud Spanner; Cloud Spanner can scale to petabyte database sizes, while Cloud SQL is limited by the size of the database instances you choose. At the time this quiz was created, the maximum was 10,230 GB.

Your Cloud Storage objects live in buckets. Which of these characteristics do you define on a per-bucket basis? Choose all that are correct (3 correct answers). A. A geographic location B. An encryption-at-rest setting (on or off) C. A default storage class D. A globally-unique name E. A default file type for the objects in the bucket

A. A geographic location C. A default storage class D. A globally-unique name

Which database service presents a MySQL or PostgreSQL interface to clients? A. Cloud SQL B. Cloud Spanner

A. Cloud SQL; Each Cloud SQL database is configured at creation time for either MySQL or PostgreSQL. Cloud Spanner uses ANSI SQL 2011 with extensions.

How are Cloud Datastore and Cloud Bigtable alike? Choose all that are correct (2 correct answers) A. They are both NoSQL databases B. They both offer SQL-like queries C. They both have a free daily quota D. They are both highly scalable

A. They are both NoSQL databases D. They are both highly scalable

True or false: Cloud Datastore databases can span App Engine and Compute Engine applications. A. True B. False

A. True