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. Which of below are predefined schemas?

choose 3

information_schema

pg_temp

pg_schema

pg_toast

2 / 20

2. Files are logically split into pages?

False

True

3 / 20

3. What is a schema?

Namespace that store all objects of a database

This is the same as a user in Postgres

The name used to refer to a super user account

A memory area used to cache data from LRU chains

4 / 20

4. What is the purpose of the postgres database?

regular database that you can use at your discretion

No such database

a template for all the other database

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

5 / 20

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

False

True

6 / 20

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

PGDATA

PGCORE

PGBASE

PGTIPS

7 / 20

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

Dan Brown

Egor Rogov

Sam Altman

Paul Sammy

8 / 20

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

Sysaux Catalog

Sys Catalog

Sysasm Catalog

System Catalog

9 / 20

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

False

True

10 / 20

10. Each Database has its own System Catalog?

True

False

11 / 20

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

True

False

12 / 20

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

False

True

13 / 20

13. How many files or forks on disk will a 10Mb table with no index have?

14 / 20

14. Which 3 databases exist directly after cluster initialization?

choose 3 options

postgres

sysaux

template0

template1

15 / 20

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

used space map

free space map

vacuum space map

wal space map

16 / 20

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

False

True

17 / 20

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

Directory Path

Access Path

Schema Path

Search Path

18 / 20

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

CreatePGC

CreateCluster

StartNewPG

Initialize

19 / 20

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

postgres

pginit

postman

init

20 / 20

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

BAKE

TOAST

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

1. A phantom read anomaly occurs when?

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.

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

2 / 10

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

True

False

3 / 10

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

True

False

4 / 10

4. Which of the below would best describe a dirty read?

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

a session being able to see uncommited data altered by another session

5 / 10

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

choose 3

Read Committed

Repeatable Read

Read Uncommitted

Serializable

6 / 10

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

Repeatable Read

Serializable

Read Uncommitted

Read Committed

7 / 10

7. The SQL standard specifies three isolation levels?

True

False

8 / 10

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

False

True

9 / 10

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

False

True

10 / 10

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

HIPPA

ACID

SAFE

SOC2

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

pg_current_xact_id()

pg_current_commit_id()

pg_current_id()

pg_current_xmin_id()

2 / 10

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

False

True

3 / 10

3. status of a subtransaction is written into CLOG?

False

True

4 / 10

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

False

True

5 / 10

5. CLOG Pages are never cached in memory?

False

True

6 / 10

6. Tuples can also be referred to as columns?

True

False

7 / 10

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

False

True

8 / 10

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

xmax

xmin

xid

xtime

9 / 10

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

xmax

xmin

xid

xmas

10 / 10

10. What does an Item Pointer contain?

choose 3

tuple status

tuple xid

tuple length

tuple offset from the start of the page

Your score is

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