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 name of the catalog that stores metadata for all cluster objects?

Sysasm Catalog

Sysaux Catalog

System Catalog

Sys Catalog

2 / 20

2. What is the default standard size for a fork file?

5MB

1MB

1GB

5GB

3 / 20

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

Choose 2 option

Quorum

Aurora

Postgres Server

Instance

4 / 20

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

Dan Brown

Paul Sammy

Egor Rogov

Sam Altman

5 / 20

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

choose 3

tables

indexes

triggers

sequences

6 / 20

6. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

template1

sysaux

postgres

7 / 20

7. What is the purpose of wal writer?

collects usage statistics for the instance.

flushes dirty pages to disk.

writes WAL entries to disk

executes checkpoints

8 / 20

8. System Catalog tables begin with which prefix?

sys_

dba_

pg_

cat_

9 / 20

9. What is the purpose of the template0 database?

Useful for creating development schemas

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

Useful for Postgres support Services to debug issues

No such database

10 / 20

10. What 3 files/forks as a minimum make up a table on disk?

table map

free space map

Main fork

visiblilty map

11 / 20

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

choose 2

pg_global

pg_temp

pg_tablespace

pg_default

12 / 20

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

GROW

BAKE

TOAST

BREAD

13 / 20

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

14 / 20

14. What is the purpose of the visibility map?

provides an audit trail for the database

provides the data decryption key

shows a page to be vacuumed or frozen

shows referential relationships for tables

15 / 20

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

True

False

16 / 20

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

True

False

17 / 20

17. TOAST tables reside in a seperate schema?

True

False

18 / 20

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

undo segments (UNDO)

write-ahead log (WAL)

online redo logs (ORL)

rollback segments (RBS)

19 / 20

19. What column in system catalogs servers as the Primary Key

obj

oid

oid#

obj#

20 / 20

20. What is another name for the postgres process?

postmaster

aurora

masterprocess

postmanager

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?

True

False

3 / 10

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

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

4 / 10

4. non-repeatable read anomaly occurs when?

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 and commits the change.

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

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

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 data direct from memory using pg_dirt

6 / 10

6. Which parameters sets the database default isolation level?

default_isolation_level

active_transaction_isolation

default_transaction_isolation

transaction_isolation_level

7 / 10

7. What is the default Isolation Level?

Read Committed

Serializable

Read Uncommitted

Repeatable Read

8 / 10

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

SOC2

SAFE

HIPPA

ACID

9 / 10

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

choose 3

Read Committed

Repeatable Read

Serializable

Read Uncommitted

10 / 10

10. A phantom read anomaly occurs when?

The same transactions issues a commit, then a rollback to restore data to its original value

The same transaction executes two identical queries returning a set of rows that satisfy a particular condition, while another transaction adds some other rows satisfying this condition and commits.

A transactions inserts a null value into a not null columns and commits

The same transaction executes two identical queries returning a set of rows that satisfy a particular condition, while another transaction also queries this same data.

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. UPDATE can be regarded as which 2 separate operations?

INSERT

COMMIT

MERGE

DELETE

2 / 10

2. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/pg_min

PGDATA/subtrans

PGDATA/pg_subtrans

3 / 10

3. index row headers like table row headers contain xmin and xmax fields?

False

True

4 / 10

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

COMMIT

DELETE

INSERT

CREATE

5 / 10

5. Which 2 items does a Virtual XID consist of?

backend process ID

sequential number

xmin

checksum

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

Each pointer uses 4 bytes

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

Also know as the pages table of contents

8 / 10

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

False

True

9 / 10

9. Page free space can often become fragmented?

True

False

10 / 10

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

True

False

Your score is

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