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. Files are logically split into pages?

True

False

2 / 20

2. Postgres uses a thread based process model?

False

True

3 / 20

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

True

False

4 / 20

4. Who is the Author of the Postgres 14 Internals book?

Sam Altman

Dan Brown

Egor Rogov

Paul Sammy

5 / 20

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

init

postgres

pginit

postman

6 / 20

6. What is the purpose of the postgres database?

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

regular database that you can use at your discretion

No such database

a template for all the other database

7 / 20

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

False

True

8 / 20

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

pg_tablespace

pg_symlinks

pg_tabspace

pg_tblspc

9 / 20

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

Search Path

Schema Path

Directory Path

Access Path

10 / 20

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

choose 3

indexes

triggers

sequences

tables

11 / 20

11. TOAST tables reside in a seperate schema?

False

True

12 / 20

12. What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

No such database

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

Useful for creating development schemas

13 / 20

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

False

True

14 / 20

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

visiblilty map

free space map

table map

Main fork

15 / 20

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

pg_class

pg_system

pg_catalog

pg_tables

16 / 20

16. What is the purpose of the template1 database?

database used for temporary tables

No such database

a template for all the other databases

regular database that you can use at your discretion

17 / 20

17. Which fork is specific for unlogged tables?

Main fork

Initialization fork

free space map

visiblilty map

18 / 20

18. Postgres server spawns a new backend session for each connection?

True

False

19 / 20

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

System Catalog

Sysaux Catalog

Sysasm Catalog

Sys Catalog

20 / 20

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

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

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

False

True

2 / 10

2. A phantom read anomaly occurs when?

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

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 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.

3 / 10

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

False

True

4 / 10

4. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Serializable

Read Committed

Rollback Read

5 / 10

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

Select more than 1 answer below:

Replace procedural code with declarative one.

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

Use a single SQL operator

6 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

7 / 10

7. 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 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 issue a rollback.

8 / 10

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

True

False

9 / 10

9. What is the default Isolation Level?

Read Uncommitted

Read Committed

Repeatable Read

Serializable

10 / 10

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

HIPPA

SOC2

ACID

SAFE

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

True

False

2 / 10

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

False

True

3 / 10

3. CLOG contains how many bits for each transaction?

4 / 10

4. Which of the below are true about a Pages Item Pointer?

Also know as the pages table of contents

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

Each pointer uses 4 bytes

5 / 10

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

True

False

6 / 10

6. Page free space can often become fragmented?

False

True

7 / 10

7. Which 2 items does a Virtual XID consist of?

xmin

sequential number

backend process ID

checksum

8 / 10

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

heap XID

magic XID

virtual XID

temporary XID

9 / 10

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

False

True

10 / 10

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

pagedetect

pageheadinfo

pagesize

pageinspect

Your score is

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