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

BREAD

GROW

TOAST

BAKE

2 / 20

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

Sysasm Catalog

Sys Catalog

System Catalog

Sysaux Catalog

3 / 20

3. A schema can belong to more than one database?

True

False

4 / 20

4. Which fork contains the actual table data?

free space map

table map

Main fork

visiblilty map

5 / 20

5. What is the purpose of autovacuum?

Deletes old logs and traces on disk

Rebuilds indexes with b level greater than 2

Removes stale data from tables and indexes

Performs a backup of WAL logs

6 / 20

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

7 / 20

7. It is the postmasters job to listener for incoming connections?

True

False

8 / 20

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

postman

postgres

init

pginit

9 / 20

9. The default Page size is 2k?

False

True

10 / 20

10. What is the purpose of the template1 database?

regular database that you can use at your discretion

No such database

database used for temporary tables

a template for all the other databases

11 / 20

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

Search Path

Access Path

Schema Path

Directory Path

12 / 20

12. What is the purpose of the visibility map?

provides the data decryption key

shows referential relationships for tables

provides an audit trail for the database

shows a page to be vacuumed or frozen

13 / 20

13. What is the purpose of the template0 database?

No such database

Useful for Postgres support Services to debug issues

Useful for creating development schemas

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

14 / 20

14. TOAST tables reside in a seperate schema?

False

True

15 / 20

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

pg_tablespace

pg_tblspc

pg_tabspace

pg_symlinks

16 / 20

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

PGDATA

PGBASE

PGTIPS

PGCORE

17 / 20

17. What is another name for the postgres process?

postmanager

postmaster

aurora

masterprocess

18 / 20

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

True

False

19 / 20

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

True

False

20 / 20

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

5GB

1MB

1GB

5MB

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

choose 3

Read Committed

Serializable

Repeatable Read

Read Uncommitted

2 / 10

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

True

False

3 / 10

3. Which parameters sets the database default isolation level?

default_isolation_level

active_transaction_isolation

transaction_isolation_level

default_transaction_isolation

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. The SQL standard specifies three isolation levels?

True

False

6 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

7 / 10

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

False

True

8 / 10

8. 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 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.

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

9 / 10

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

True

False

10 / 10

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

Serializable

Repeatable Read

Read Uncommitted

Read Committed

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

True

False

2 / 10

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

sequential number

backend process ID

checksum

xmin

3 / 10

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

choose 2

flashback block

page header

free space

undo segment

4 / 10

4. If a transaction aborts, all page changes are reverted(rolled back) in place?

False

True

5 / 10

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

False

True

6 / 10

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

DELETE

INSERT

COMMIT

CREATE

7 / 10

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

True

False

8 / 10

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

True

False

9 / 10

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

COMMIT

MERGE

INSERT

DELETE

10 / 10

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

True

False

Your score is

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