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

What is the purpose of the template1 database?

database used for temporary tables

a template for all the other databases

regular database that you can use at your discretion

No such database

2 / 20

Tablespaces are used to define physical data layout?

False

True

3 / 20

What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

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

Useful for creating development schemas

No such database

4 / 20

The information_schema schema provides information on Postgres release notes?

False

True

5 / 20

A single Postgres Instance can server only one database?

True

False

6 / 20

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

choose 3

sequences

indexes

tables

triggers

7 / 20

Each tablespaces can only be assigned for use by one database

True

False

8 / 20

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

PGBASE

PGCORE

PGTIPS

PGDATA

9 / 20

What is the purpose of wal writer?

flushes dirty pages to disk.

writes WAL entries to disk

executes checkpoints

collects usage statistics for the instance.

10 / 20

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

False

True

11 / 20

Each Database has its own System Catalog?

True

False

12 / 20

TOAST tables reside in a seperate schema?

False

True

13 / 20

To be able to restore data consistency, Postgres maintains

undo segments (UNDO)

online redo logs (ORL)

rollback segments (RBS)

write-ahead log (WAL)

14 / 20

What is the default standard size for a fork file?

1GB

1MB

5MB

5GB

15 / 20

It is the postmasters job to listener for incoming connections?

False

True

16 / 20

What is the purpose of the public schema?

schema used for heterogeneous replication

default schema for user objects

no such schema

restricted schema for postgres internal usage only

17 / 20

Who is the Author of the Postgres 14 Internals book?

Paul Sammy

Sam Altman

Dan Brown

Egor Rogov

18 / 20

What is the purpose of the postgres database?

No such database

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

regular database that you can use at your discretion

a template for all the other database

19 / 20

Which of below are predefined schemas?

choose 3

pg_temp

information_schema

pg_toast

pg_schema

20 / 20

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

BREAD

TOAST

BAKE

GROW

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

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

2 / 10

Which of the below are valid Isolations Levels?

choose 2

Serializable

Read Committed

Random Scatter

Rollback Read

3 / 10

The SQL standard specifies three isolation levels?

True

False

4 / 10

Which parameters sets the database default isolation level?

active_transaction_isolation

default_transaction_isolation

transaction_isolation_level

default_isolation_level

5 / 10

What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

Apply explicit locks

6 / 10

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

True

False

7 / 10

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

Read Committed

Serializable

Repeatable Read

Read Uncommitted

8 / 10

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

True

False

9 / 10

non-repeatable read anomaly occurs when?

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.

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 and commits the change.

10 / 10

Which of the below would best describe a dirty read?

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

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

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

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

True

False

2 / 10

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

True

False

3 / 10

Each page has a layer that usually consists of?

choose 2

undo segment

flashback block

page header

free space

4 / 10

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

xtime

xmin

xid

xmax

5 / 10

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

INSERT

CREATE

COMMIT

DELETE

6 / 10

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

False

True

7 / 10

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

xmax

xid

xmin

xmas

8 / 10

Postgres table physical data files are always cross compatible across platforms?

True

False

9 / 10

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

pg_current_xmin_id()

pg_current_xact_id()

pg_current_commit_id()

pg_current_id()

10 / 10

The page Special Space is located at the start of the page with highest address

True

False

Your score is

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