Postgres Quiz Archive

You have 200 seconds to answer 20 Random questions so think fast!

You will need to score 80% or over to pass!

Created by

Paul Sammy

PostgreSQL 14 Internals Chapter 1

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 1.

1 / 20

1. Which of the below objects can be referred to as relations?

choose 3

sequences

triggers

indexes

tables

2 / 20

2. TOAST tables reside in a seperate schema?

False

True

3 / 20

3. Which fork keeps track of available space within pages?

free space map

used space map

wal space map

vacuum space map

4 / 20

4. Files are logically split into pages?

True

False

5 / 20

5. Each tablespaces can only be assigned for use by one database

True

False

6 / 20

6. System Catalog tables begin with which prefix?

pg_

dba_

sys_

cat_

7 / 20

7. What is the name of the 2 default tablespaces created after initialization?

choose 2

pg_default

pg_global

pg_tablespace

pg_temp

8 / 20

8. Which of below are predefined schemas?

choose 3

pg_temp

pg_schema

pg_toast

information_schema

9 / 20

9. What is the name of the mechanism used to store a row bigger than a page size?

TOAST

BREAD

GROW

BAKE

10 / 20

10. What is the purpose of the postgres database?

regular database that you can use at your discretion

a template for all the other database

No such database

restoring data from a logical backup or creating a database with a different encoding

11 / 20

11. A single Postgres Instance can server only one database?

True

False

12 / 20

12. It is the postmasters job to listener for incoming connections?

True

False

13 / 20

13. What is the name of the system catalog table for relations?

pg_class

pg_catalog

pg_system

pg_tables

14 / 20

14. Postgres uses a thread based process model?

False

True

15 / 20

15. What is the purpose of the template0 database?

No such database

Useful for creating development schemas

Useful for Postgres support Services to debug issues

Useful for restoring data from a logical backup or creating a database with a different encoding

16 / 20

16. Some System Catalog tables are common to all databases in the cluster?

False

True

17 / 20

17. Which of below are predefined schemas?

choose 2

system

pg_catalog

public

postgres

18 / 20

18. To be able to restore data consistency, Postgres maintains

rollback segments (RBS)

online redo logs (ORL)

write-ahead log (WAL)

undo segments (UNDO)

19 / 20

19. The pg_default tablespace should never be used to create user tables?

False

True

20 / 20

20. The information_schema schema provides information on Postgres release notes?

True

False

Your score is

Created by

Paul Sammy

PostgreSQL 14 Internals Chapter 2

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 2.

1 / 10

1. What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Use a single SQL operator

Replace procedural code with declarative one.

Apply explicit locks

2 / 10

2. The SQL standard specifies three isolation levels?

False

True

3 / 10

3. The more locks a transaction acquires, the better it is isolated from other transactions?

False

True

4 / 10

4. Data Consistency is best handled at the application layer rather than at the database layer?

False

True

5 / 10

5. Based on Snapshot Isolation use of MVCC which of the below are permitted?

choose 3

Read Committed

Read Uncommitted

Repeatable Read

Serializable

6 / 10

6. non-repeatable read anomaly occurs when?

A transaction reads one and the same row once and modifies this row and commits the change.

A transaction reads one and the same row twice, another transaction modifies this row between these reads and commits the change.

A transaction reads one and the same row once, another transaction modifies this row between these reads and commits the change.

A transaction reads one and the same row twice, another transaction modifies this row between these reads issue a rollback.

7 / 10

7. At any moment the database system can contain several versions of one and the same row?

False

True

8 / 10

8. Which of the below would best describe a dirty read?

reading data direct from memory using pg_dirt

a session being able to see commited data altered by another session

a session being able to see uncommited data altered by another session

reading the data directly from file using a text editor such as vi or notepad

9 / 10

9. which of the below statements will start a transaction as Read Repeatable?

ALTER SYSTEM SET ISO=REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

10 / 10

10. Lost updates are forbidden by the standard at all isolation levels?

True

False

Your score is

Created by

Paul Sammy

PostgreSQL 14 Internals Chapter 3

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 3.

1 / 10

1. The page Special Space is located at the start of the page with highest address

False

True

2 / 10

2. Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/pg_min

PGDATA/subtrans

PGDATA/pg_xid

3 / 10

3. CLOG contains how many bits for each transaction?

4 / 10

4. virtual IDs exist only in PGDATA/pg_vxid when not cached?

True

False

5 / 10

5. Each page has a layer that usually consists of?

choose 2

flashback block

undo segment

free space

page header

6 / 10

6. Indexes values also support multi versioning with several versions of an index value existing at any point in time?

True

False

7 / 10

7. When a row is created, its xmin value is set to the transaction ID of which command?

CREATE

DELETE

INSERT

COMMIT

8 / 10

8. status of a subtransaction is written into CLOG?

True

False

9 / 10

9. indexes do not use row versioning?

True

False

10 / 10

10. UPDATE can be regarded as which 2 separate operations?

MERGE

INSERT

COMMIT

DELETE

Your score is

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