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 a schema?

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

Namespace that store all objects of a database

2 / 20

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

False

True

3 / 20

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

PGBASE

PGDATA

PGTIPS

PGCORE

4 / 20

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

choose 2

pg_temp

pg_global

pg_tablespace

pg_default

5 / 20

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

Choose 2 option

Aurora

Quorum

Postgres Server

Instance

6 / 20

Which fork keeps track of available space within pages?

wal space map

used space map

vacuum space map

free space map

7 / 20

Users should not modify the template0 database

True

False

8 / 20

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

free space map

visiblilty map

table map

Main fork

9 / 20

Who is the Author of the Postgres 14 Internals book?

Sam Altman

Dan Brown

Paul Sammy

Egor Rogov

10 / 20

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

True

False

11 / 20

Each Database has its own System Catalog?

True

False

12 / 20

What column in system catalogs servers as the Primary Key

obj#

oid#

obj

oid

13 / 20

What is another name for the postgres process?

masterprocess

aurora

postmanager

postmaster

14 / 20

What command is used to create the Postgres cluster?

CreatePGC

CreateCluster

Initialize

StartNewPG

15 / 20

The information_schema schema provides information on Postgres release notes?

False

True

16 / 20

Postgres by default has built in connection pooling abilities?

False

True

17 / 20

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

System Catalog

Sysaux Catalog

Sys Catalog

Sysasm Catalog

18 / 20

Which of below are predefined schemas?

choose 2

system

pg_catalog

postgres

public

19 / 20

What is the default standard size for a fork file?

1GB

1MB

5MB

5GB

20 / 20

Postgres server spawns a new backend session for each connection?

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

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

True

False

2 / 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

3 / 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 adds some other rows satisfying this condition 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.

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

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

4 / 10

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

Serializable

Read Uncommitted

Read Committed

Repeatable Read

5 / 10

Which of the below would best describe a dirty read?

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

reading data direct from memory using pg_dirt

6 / 10

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 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 twice, another transaction modifies this row between these reads and commits the change.

7 / 10

Which parameters sets the database default isolation level?

active_transaction_isolation

transaction_isolation_level

default_isolation_level

default_transaction_isolation

8 / 10

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

choose 3

Read Committed

Read Uncommitted

Serializable

Repeatable Read

9 / 10

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

ACID

HIPPA

SOC2

SAFE

10 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

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

Tuples can also be referred to as columns?

False

True

2 / 10

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

xmin

xtime

xid

xmax

3 / 10

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

True

False

4 / 10

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

False

True

5 / 10

Each page has a layer that usually consists of?

choose 2

undo segment

free space

flashback block

page header

6 / 10

If a transaction aborts, all page changes are reverted(rolled back) in place?

True

False

7 / 10

What does an Item Pointer contain?

choose 3

tuple length

tuple xid

tuple offset from the start of the page

tuple status

8 / 10

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

pg_current_id()

pg_current_xmin_id()

pg_current_xact_id()

pg_current_commit_id()

9 / 10

Rows of TOAST tables are handled in such a way that they are never update?

False

True

10 / 10

If a transaction is read only which kind of Transaction ID is it allocated?

temporary XID

virtual XID

magic XID

heap XID

Your score is

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