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

True

False

2 / 20

2. A schema can belong to more than one database?

True

False

3 / 20

3. Files are logically split into pages?

True

False

4 / 20

4. Postgres server spawns a new backend session for each connection?

False

True

5 / 20

5. 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

6 / 20

6. Which of below are predefined schemas?

choose 2

public

system

postgres

pg_catalog

7 / 20

7. A Postgres cluster consists of 2 or more physical servers accessing one Postgres Instance?

False

True

8 / 20

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

False

True

9 / 20

9. To understand each other, a client and a server must use one and the same interfacing protocol?

True

False

10 / 20

10. What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

stores temporary tables that are common to the whole cluster

11 / 20

11. Which fork contains the actual table data?

Main fork

visiblilty map

free space map

table map

12 / 20

12. System Catalog tables begin with which prefix?

sys_

cat_

dba_

pg_

13 / 20

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

choose 2

pg_tablespace

pg_default

pg_temp

pg_global

14 / 20

14. What is the purpose of wal writer?

flushes dirty pages to disk.

executes checkpoints

collects usage statistics for the instance.

writes WAL entries to disk

15 / 20

15. What is the purpose of the template1 database?

database used for temporary tables

a template for all the other databases

No such database

regular database that you can use at your discretion

16 / 20

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

False

True

17 / 20

17. What is the name of the directory that contains the files related to the Postgres cluster?

PGCORE

PGBASE

PGDATA

PGTIPS

18 / 20

18. Each Database has its own System Catalog?

True

False

19 / 20

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

pg_catalog

pg_tables

pg_class

pg_system

20 / 20

20. What is the process first launched at server start?

init

postgres

postman

pginit

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. non-repeatable read anomaly occurs when?

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 and modifies this row 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.

2 / 10

2. The SQL standard specifies three isolation levels?

False

True

3 / 10

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

False

True

4 / 10

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

reading data direct from memory using pg_dirt

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

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

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

5 / 10

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

False

True

6 / 10

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

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

7 / 10

7. What is the acronym used for the attributes that ensure Data consistency, integrity and durability?

HIPPA

ACID

SAFE

SOC2

8 / 10

8. Which isolation level in theory could mean an application does not have to consider isolation anomalies?

Read Uncommitted

Serializable

Repeatable Read

Read Committed

9 / 10

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

True

False

10 / 10

10. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Serializable

Random Scatter

Read Committed

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. Rows of TOAST tables are handled in such a way that they are never update?

False

True

2 / 10

2. The page header stores checksum and the sizes of the other parts of the page?

True

False

3 / 10

3. In Postgres, tables are often referred to as which of the below?

dump

view

heap

clog

4 / 10

4. If a transaction is read only which kind of Transaction ID is it allocated?

virtual XID

temporary XID

magic XID

heap XID

5 / 10

5. a transaction containing a savepoint is will still be considered as only a single transaction?

True

False

6 / 10

6. The page header is located in the highest address?

False

True

7 / 10

7. indexes do not use row versioning?

False

True

8 / 10

8. Page free space can often become fragmented?

False

True

9 / 10

9. Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_subtrans

PGDATA/pg_xid

PGDATA/pg_min

10 / 10

10. Which 2 of the below represent transaction IDs used for row versioning?

xtime

xid

xmin

xmax

Your score is

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