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

The default Page size is 2k?

True

False

2 / 20

TOAST tables reside in a seperate schema?

False

True

3 / 20

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

pg_tables

pg_class

pg_catalog

pg_system

4 / 20

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

free space map

visiblilty map

Main fork

table map

5 / 20

What is the purpose of the template0 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

No such database

6 / 20

Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

postgres

sysaux

template1

7 / 20

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

8 / 20

Tablespaces can be used to segregate data based on performance needs?

False

True

9 / 20

Postgres server spawns a new backend session for each connection?

False

True

10 / 20

How many files or forks on disk will a 10Mb table with no index have?

11 / 20

What is a schema?

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

The name used to refer to a super user account

Namespace that store all objects of a database

12 / 20

The information_schema schema provides information on Postgres release notes?

False

True

13 / 20

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

True

False

14 / 20

A schema can belong to more than one database?

True

False

15 / 20

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

False

True

16 / 20

Which of below are predefined schemas?

choose 2

public

system

pg_catalog

postgres

17 / 20

System Catalog tables begin with which prefix?

sys_

pg_

dba_

cat_

18 / 20

It is the postmasters job to listener for incoming connections?

True

False

19 / 20

What is the purpose of the postgres database?

No such database

regular database that you can use at your discretion

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

a template for all the other database

20 / 20

Who is the Author of the Postgres 14 Internals book?

Dan Brown

Egor Rogov

Sam Altman

Paul Sammy

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

The SQL standard specifies three isolation levels?

True

False

2 / 10

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

False

True

3 / 10

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

True

False

4 / 10

Which parameters sets the database default isolation level?

default_transaction_isolation

transaction_isolation_level

active_transaction_isolation

default_isolation_level

5 / 10

A phantom read anomaly occurs when?

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.

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

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.

6 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

7 / 10

Which of the below would best describe a dirty read?

reading data direct from memory using pg_dirt

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

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

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

8 / 10

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

False

True

9 / 10

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

SAFE

SOC2

ACID

HIPPA

10 / 10

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

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

status of a subtransaction is written into CLOG?

True

False

2 / 10

Tuples can also be referred to as columns?

True

False

3 / 10

CLOG contains how many bits for each transaction?

4 / 10

Which function can we use to find the current transaction ID?

pg_current_commit_id()

pg_current_xmin_id()

pg_current_id()

pg_current_xact_id()

5 / 10

Page free space can often become fragmented?

False

True

6 / 10

To identify different versions of one and the same row, PostgreSQL marks each of them with which two value?

xmas

xmax

xmin

xid

7 / 10

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

False

True

8 / 10

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

COMMIT

DELETE

CREATE

INSERT

9 / 10

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

True

False

10 / 10

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

xmin

xtime

xid

xmax

Your score is

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