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. Each tablespaces can only be assigned for use by one database

False

True

2 / 20

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

pg_catalog

pg_system

pg_tables

pg_class

3 / 20

3. Which of below are predefined schemas?

choose 3

information_schema

pg_toast

pg_schema

pg_temp

4 / 20

4. Which fork is specific for unlogged tables?

Main fork

Initialization fork

visiblilty map

free space map

5 / 20

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

Choose 2 option

Aurora

Postgres Server

Quorum

Instance

6 / 20

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

True

False

7 / 20

7. Postgres by default has built in connection pooling abilities?

False

True

8 / 20

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

PGCORE

PGBASE

PGTIPS

PGDATA

9 / 20

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

10 / 20

10. What is the process first launched at server start?

postgres

init

pginit

postman

11 / 20

11. What is the purpose of autovacuum?

Rebuilds indexes with b level greater than 2

Removes stale data from tables and indexes

Deletes old logs and traces on disk

Performs a backup of WAL logs

12 / 20

12. The default Page size is 2k?

True

False

13 / 20

13. pg_catalog schema is used to store system catalog tables?

True

False

14 / 20

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

choose 3

triggers

tables

sequences

indexes

15 / 20

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

pg_tabspace

pg_tablespace

pg_symlinks

pg_tblspc

16 / 20

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

True

False

17 / 20

17. A single Postgres Instance can server only one database?

False

True

18 / 20

18. What is the purpose of the template0 database?

No such 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

19 / 20

19. Tablespaces are used to define physical data layout?

True

False

20 / 20

20. Postgres uses a thread based process model?

False

True

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. 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

2 / 10

2. Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

active_transaction_isolation

default_isolation_level

3 / 10

3. 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

4 / 10

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

choose 3

Read Uncommitted

Repeatable Read

Read Committed

Serializable

5 / 10

5. non-repeatable read anomaly occurs when?

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 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.

6 / 10

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

True

False

7 / 10

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

Repeatable Read

Read Uncommitted

Read Committed

Serializable

8 / 10

8. What is the default Isolation Level?

Serializable

Read Committed

Repeatable Read

Read Uncommitted

9 / 10

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

ACID

HIPPA

SOC2

SAFE

10 / 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

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

True

False

2 / 10

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

xmax

xid

xmas

xmin

3 / 10

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

False

True

4 / 10

4. In Postgres, tables are often referred to as which of the below?

heap

dump

clog

view

5 / 10

5. CLOG files are stored in which directory?

PGDATA/pg_xact

PGDATA/pg_commit

PGDATA/pg_clog

PGDATA/clog

6 / 10

6. Page free space can often become fragmented?

True

False

7 / 10

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

False

True

8 / 10

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

True

False

9 / 10

9. A page along with its tuples is read into the buffer cache with compression transformations to enhance cache efficiency?

True

False

10 / 10

10. UPDATE can be regarded as which 2 separate operations?

DELETE

MERGE

COMMIT

INSERT

Your score is

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