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

Which fork keeps track of available space within pages?

vacuum space map

free space map

wal space map

used space map

2 / 20

Which fork contains the actual table data?

Main fork

table map

free space map

visiblilty map

3 / 20

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

False

True

4 / 20

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

Choose 2 option

Instance

Quorum

Postgres Server

Aurora

5 / 20

Postgres server spawns a new backend session for each connection?

False

True

6 / 20

What is the process first launched at server start?

pginit

postman

postgres

init

7 / 20

The information_schema schema provides information on Postgres release notes?

True

False

8 / 20

A single Postgres Instance can server only one database?

False

True

9 / 20

What is the point of the pg_global tablespace?

stores user tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

10 / 20

Which fork is specific for unlogged tables?

free space map

Initialization fork

Main fork

visiblilty map

11 / 20

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

choose 3

tables

sequences

indexes

triggers

12 / 20

If we create a new tablespace which directory will symbolic links be created from?

pg_symlinks

pg_tabspace

pg_tablespace

pg_tblspc

13 / 20

What is the purpose of the template1 database?

regular database that you can use at your discretion

No such database

a template for all the other databases

database used for temporary tables

14 / 20

Files are logically split into pages?

True

False

15 / 20

Each tablespaces can only be assigned for use by one database

False

True

16 / 20

What is the purpose of wal writer?

executes checkpoints

flushes dirty pages to disk.

collects usage statistics for the instance.

writes WAL entries to disk

17 / 20

Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

template1

sysaux

postgres

18 / 20

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

True

False

19 / 20

Which of below are predefined schemas?

choose 3

pg_toast

information_schema

pg_schema

pg_temp

20 / 20

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

TOAST

BAKE

BREAD

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 parameters sets the database default isolation level?

default_isolation_level

default_transaction_isolation

active_transaction_isolation

transaction_isolation_level

2 / 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 twice, 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.

3 / 10

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

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Use a single SQL operator

Apply explicit locks

Replace procedural code with declarative one.

4 / 10

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

True

False

5 / 10

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

True

False

6 / 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 also queries this same data.

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 adds some other rows satisfying this condition and commits.

7 / 10

What is the default Isolation Level?

Read Uncommitted

Repeatable Read

Serializable

Read Committed

8 / 10

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

SAFE

ACID

SOC2

HIPPA

9 / 10

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

choose 3

Repeatable Read

Read Uncommitted

Serializable

Read Committed

10 / 10

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

False

True

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

indexes do not use row versioning?

True

False

2 / 10

The page header is located in the highest address?

False

True

3 / 10

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

True

False

4 / 10

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

True

False

5 / 10

Which 2 items does a Virtual XID consist of?

backend process ID

xmin

checksum

sequential number

6 / 10

status of a subtransaction is written into CLOG?

True

False

7 / 10

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

False

True

8 / 10

Page header sizes can be easily displayed using the <choose from answers> extension

pageheadinfo

pagesize

pageinspect

pagedetect

9 / 10

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

False

True

10 / 10

Page free space can often become fragmented?

True

False

Your score is

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