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

False

True

2 / 20

2. What command is used to create the Postgres cluster?

CreateCluster

StartNewPG

Initialize

CreatePGC

3 / 20

3. TOAST tables reside in a seperate schema?

True

False

4 / 20

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

Choose 2 option

Quorum

Postgres Server

Instance

Aurora

5 / 20

5. Postgres uses a thread based process model?

False

True

6 / 20

6. Which of below are predefined schemas?

choose 3

pg_schema

pg_toast

pg_temp

information_schema

7 / 20

7. The information_schema schema provides information on Postgres release notes?

False

True

8 / 20

8. The default Page size is 2k?

True

False

9 / 20

9. Tablespaces are used to define physical data layout?

False

True

10 / 20

10. How does Postgres know which schema to use if not specified?

Directory Path

Schema Path

Search Path

Access Path

11 / 20

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

False

True

12 / 20

12. What is the purpose of the postgres database?

a template for all the other 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

13 / 20

13. System Catalog tables begin with which prefix?

sys_

pg_

dba_

cat_

14 / 20

14. What is the purpose of the public schema?

schema used for heterogeneous replication

restricted schema for postgres internal usage only

default schema for user objects

no such schema

15 / 20

15. Users should not modify the template0 database

False

True

16 / 20

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

pg_tblspc

pg_symlinks

pg_tablespace

pg_tabspace

17 / 20

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

False

True

18 / 20

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

PGCORE

PGBASE

PGDATA

PGTIPS

19 / 20

19. What is the purpose of the template1 database?

regular database that you can use at your discretion

database used for temporary tables

a template for all the other databases

No such database

20 / 20

20. Which fork keeps track of available space within pages?

wal space map

free space map

vacuum space map

used space map

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

True

False

2 / 10

2. 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 data direct from memory using pg_dirt

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

3 / 10

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

A transaction reads one and the same row once, another transaction modifies this row between these reads and commits the change.

4 / 10

4. At any moment the database system can contain several versions of one and the same row?

True

False

5 / 10

5. 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

Replace procedural code with declarative one.

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

6 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

7 / 10

7. 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

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

SOC2

HIPPA

SAFE

ACID

9 / 10

9. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Random Scatter

Serializable

10 / 10

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

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

pageheadinfo

pagedetect

pagesize

pageinspect

2 / 10

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

xmin

xtime

xid

xmax

3 / 10

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

DELETE

INSERT

COMMIT

CREATE

4 / 10

4. Tuples can also be referred to as columns?

True

False

5 / 10

5. Each page has a layer that usually consists of?

choose 2

flashback block

free space

undo segment

page header

6 / 10

6. indexes do not use row versioning?

False

True

7 / 10

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

pg_current_id()

pg_current_commit_id()

pg_current_xmin_id()

pg_current_xact_id()

8 / 10

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

False

True

9 / 10

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

False

True

10 / 10

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

True

False

Your score is

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