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. What is the purpose of the template1 database?

regular database that you can use at your discretion

No such database

database used for temporary tables

a template for all the other databases

2 / 20

2. What is the purpose of the public schema?

default schema for user objects

restricted schema for postgres internal usage only

schema used for heterogeneous replication

no such schema

3 / 20

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

StartNewPG

CreateCluster

Initialize

CreatePGC

4 / 20

4. Which fork contains the actual table data?

Main fork

free space map

visiblilty map

table map

5 / 20

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

choose 2

pg_temp

pg_tablespace

pg_default

pg_global

6 / 20

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

PGTIPS

PGCORE

PGDATA

PGBASE

7 / 20

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

True

False

8 / 20

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

False

True

9 / 20

9. What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

No such database

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

Useful for creating development schemas

10 / 20

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

used space map

vacuum space map

free space map

wal space map

11 / 20

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

True

False

12 / 20

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

online redo logs (ORL)

write-ahead log (WAL)

undo segments (UNDO)

rollback segments (RBS)

13 / 20

13. What is the purpose of autovacuum?

Performs a backup of WAL logs

Removes stale data from tables and indexes

Deletes old logs and traces on disk

Rebuilds indexes with b level greater than 2

14 / 20

14. What is the point of the pg_global tablespace?

stores user tables that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores WAL logs used for global replication

15 / 20

15. Who is the Author of the Postgres 14 Internals book?

Egor Rogov

Paul Sammy

Dan Brown

Sam Altman

16 / 20

16. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

postgres

template1

sysaux

17 / 20

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

pg_tables

pg_class

pg_catalog

pg_system

18 / 20

18. TOAST tables reside in a seperate schema?

False

True

19 / 20

19. How many rows in a page does Postgres aim to have before considering TOAST?

20 / 20

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

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

Serializable

Repeatable Read

Read Uncommitted

Read Committed

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

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

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.

5 / 10

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

SOC2

HIPPA

SAFE

ACID

6 / 10

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

True

False

7 / 10

7. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Serializable

Random Scatter

Read Committed

8 / 10

8. The SQL standard specifies three isolation levels?

True

False

9 / 10

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

False

True

10 / 10

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

choose 3

Read Committed

Serializable

Repeatable Read

Read Uncommitted

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 header stores checksum and the sizes of the other parts of the page?

False

True

2 / 10

2. Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_min

PGDATA/pg_subtrans

PGDATA/pg_xid

3 / 10

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

choose 2

page header

free space

flashback block

undo segment

4 / 10

4. Which of the below are true about a Pages Item Pointer?

Each pointer uses 4 bytes

Each pointer uses 8 bytes

Also know as the pages table of contents

stored in PGDATA/itemptr directory

5 / 10

5. A page along with its tuples is read into the buffer cache with compression transformations to enhance cache efficiency?

True

False

6 / 10

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

CREATE

INSERT

COMMIT

DELETE

7 / 10

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

False

True

8 / 10

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

True

False

9 / 10

9. at any one time Postgres can have several versions of a row?

False

True

10 / 10

10. Page free space can often become fragmented?

False

True

Your score is

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