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

True

False

2 / 20

2. Which of below are predefined schemas?

choose 3

pg_schema

information_schema

pg_temp

pg_toast

3 / 20

3. When PostgreSQL is running what can it be referred to as?

Choose 2 option

Quorum

Aurora

Instance

Postgres Server

4 / 20

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

True

False

5 / 20

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

False

True

6 / 20

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

True

False

7 / 20

7. What is the point of the pg_global tablespace?

stores temporary tables 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 system catalog objects that are common to the whole cluster

8 / 20

8. Tablespaces are used to define physical data layout?

False

True

9 / 20

9. What command is used to create the Postgres cluster?

CreateCluster

Initialize

StartNewPG

CreatePGC

10 / 20

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

False

True

11 / 20

11. Which of below are predefined schemas?

choose 2

pg_catalog

system

postgres

public

12 / 20

12. Postgres uses a thread based process model?

True

False

13 / 20

13. Each Database has its own System Catalog?

False

True

14 / 20

14. What is the purpose of autovacuum?

Rebuilds indexes with b level greater than 2

Removes stale data from tables and indexes

Performs a backup of WAL logs

Deletes old logs and traces on disk

15 / 20

15. Files are logically split into pages?

False

True

16 / 20

16. What is a schema?

Namespace that store all objects of a database

A memory area used to cache data from LRU chains

The name used to refer to a super user account

This is the same as a user in Postgres

17 / 20

17. What is the purpose of the template1 database?

a template for all the other databases

regular database that you can use at your discretion

database used for temporary tables

No such database

18 / 20

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

choose 3

sequences

indexes

tables

triggers

19 / 20

19. TOAST tables reside in a seperate schema?

False

True

20 / 20

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

False

True

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

False

True

2 / 10

2. Snapshot isolation is preferred but increases the number of required locks?

False

True

3 / 10

3. Which parameters sets the database default isolation level?

transaction_isolation_level

active_transaction_isolation

default_transaction_isolation

default_isolation_level

4 / 10

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

choose 3

Repeatable Read

Read Uncommitted

Serializable

Read Committed

5 / 10

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

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

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

6 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

7 / 10

7. 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, 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 twice, another transaction modifies this row between these reads issue a rollback.

8 / 10

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

ACID

SOC2

SAFE

HIPPA

9 / 10

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

False

True

10 / 10

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

False

True

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. psql provides a special mode that allows you to continue a transaction after a failure?

True

False

2 / 10

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

xtime

xmax

xid

xmin

3 / 10

3. Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/pg_xid

PGDATA/subtrans

PGDATA/pg_min

4 / 10

4. indexes do not use row versioning?

True

False

5 / 10

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

False

True

6 / 10

6. CLOG Pages are never cached in memory?

True

False

7 / 10

7. CLOG files are stored in which directory?

PGDATA/pg_xact

PGDATA/clog

PGDATA/pg_clog

PGDATA/pg_commit

8 / 10

8. CLOG contains how many bits for each transaction?

9 / 10

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

heap

clog

dump

view

10 / 10

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

False

True

Your score is

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