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

Search Path

Schema Path

Directory Path

Access Path

2 / 20

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

5GB

1MB

1GB

5MB

3 / 20

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

postman

pginit

init

postgres

4 / 20

4. What column in system catalogs servers as the Primary Key

oid

obj#

obj

oid#

5 / 20

5. What is the purpose of the template0 database?

Useful for creating development schemas

No such database

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

Useful for Postgres support Services to debug issues

6 / 20

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

Dan Brown

Egor Rogov

Sam Altman

Paul Sammy

7 / 20

7. What is the purpose of autovacuum?

Performs a backup of WAL logs

Removes stale data from tables and indexes

Rebuilds indexes with b level greater than 2

Deletes old logs and traces on disk

8 / 20

8. Postgres uses a thread based process model?

True

False

9 / 20

9. Which of below are predefined schemas?

choose 2

public

system

postgres

pg_catalog

10 / 20

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

StartNewPG

CreatePGC

Initialize

CreateCluster

11 / 20

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

BAKE

BREAD

TOAST

GROW

12 / 20

12. To be able to restore data consistency, Postgres maintains

undo segments (UNDO)

rollback segments (RBS)

online redo logs (ORL)

write-ahead log (WAL)

13 / 20

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

True

False

14 / 20

14. Files are logically split into pages?

False

True

15 / 20

15. What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

16 / 20

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

True

False

17 / 20

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

Sysasm Catalog

System Catalog

Sys Catalog

Sysaux Catalog

18 / 20

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

False

True

19 / 20

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

True

False

20 / 20

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

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

True

False

2 / 10

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

False

True

3 / 10

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

ACID

SAFE

SOC2

HIPPA

4 / 10

4. A phantom read anomaly occurs when?

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

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.

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 adds some other rows satisfying this condition and commits.

5 / 10

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

False

True

6 / 10

6. non-repeatable read anomaly occurs when?

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 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 issue a rollback.

7 / 10

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

choose 3

Read Uncommitted

Read Committed

Serializable

Repeatable Read

8 / 10

8. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Read Committed

Rollback Read

Serializable

9 / 10

9. Which parameters sets the database default isolation level?

default_isolation_level

transaction_isolation_level

active_transaction_isolation

default_transaction_isolation

10 / 10

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

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 2 items does a Virtual XID consist of?

xmin

backend process ID

sequential number

checksum

2 / 10

2. The page Special Space is located at the start of the page with highest address

True

False

3 / 10

3. What does an Item Pointer contain?

choose 3

tuple length

tuple status

tuple xid

tuple offset from the start of the page

4 / 10

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

choose 2

undo segment

flashback block

page header

free space

5 / 10

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

True

False

6 / 10

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

False

True

7 / 10

7. indexes do not use row versioning?

False

True

8 / 10

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

False

True

9 / 10

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

True

False

10 / 10

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

pg_current_xact_id()

pg_current_commit_id()

pg_current_xmin_id()

pg_current_id()

Your score is

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