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. A single Postgres Instance can server only one database?

True

False

2 / 20

2. Which fork contains the actual table data?

free space map

Main fork

table map

visiblilty map

3 / 20

3. Postgres uses a thread based process model?

True

False

4 / 20

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

False

True

5 / 20

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

Sys Catalog

Sysaux Catalog

System Catalog

Sysasm Catalog

6 / 20

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

Main fork

visiblilty map

table map

free space map

7 / 20

7. Each Database has its own System Catalog?

True

False

8 / 20

8. What is the default standard size for a fork file?

5MB

1MB

1GB

5GB

9 / 20

9. What is another name for the postgres process?

masterprocess

postmaster

postmanager

aurora

10 / 20

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

True

False

11 / 20

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

False

True

12 / 20

12. What is the purpose of the postgres database?

No such database

a template for all the other 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. What is the process first launched at server start?

init

postman

pginit

postgres

14 / 20

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

False

True

15 / 20

15. Users should not modify the template0 database

False

True

16 / 20

16. TOAST tables reside in a seperate schema?

True

False

17 / 20

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

used space map

vacuum space map

free space map

wal space map

18 / 20

18. What is a schema?

The name used to refer to a super user account

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

Namespace that store all objects of a database

19 / 20

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

Schema Path

Search Path

Access Path

Directory Path

20 / 20

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

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. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Random Scatter

Serializable

2 / 10

2. 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;

3 / 10

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

True

False

4 / 10

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

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

reading data direct from memory using pg_dirt

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

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

5 / 10

5. 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 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.

6 / 10

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

HIPPA

ACID

SOC2

SAFE

7 / 10

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

Read Uncommitted

Serializable

Read Committed

Repeatable Read

8 / 10

8. Which parameters sets the database default isolation level?

transaction_isolation_level

default_isolation_level

active_transaction_isolation

default_transaction_isolation

9 / 10

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

True

False

10 / 10

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

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

Also know as the pages table of contents

Each pointer uses 8 bytes

Each pointer uses 4 bytes

stored in PGDATA/itemptr directory

2 / 10

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

True

False

3 / 10

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

True

False

4 / 10

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

magic XID

heap XID

virtual XID

temporary XID

5 / 10

5. When a transaction is committed Postgres uses a special <replace with answer> structure?

transaction log

redo log

archive log

commit log

6 / 10

6. CLOG contains how many bits for each transaction?

7 / 10

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

pagesize

pageinspect

pagedetect

pageheadinfo

8 / 10

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

False

True

9 / 10

9. Tuples can also be referred to as columns?

True

False

10 / 10

10. status of a subtransaction is written into CLOG?

False

True

Your score is

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