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 2 default tablespaces created after initialization?

choose 2

pg_temp

pg_global

pg_tablespace

pg_default

2 / 20

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

False

True

3 / 20

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

5GB

1GB

1MB

5MB

4 / 20

4. What is the purpose of the public schema?

no such schema

schema used for heterogeneous replication

default schema for user objects

restricted schema for postgres internal usage only

5 / 20

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

postgres

pginit

postman

init

6 / 20

6. Tablespaces are used to define physical data layout?

False

True

7 / 20

7. Which fork is specific for unlogged tables?

Initialization fork

visiblilty map

free space map

Main fork

8 / 20

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

False

True

9 / 20

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

True

False

10 / 20

10. Each Database has its own System Catalog?

False

True

11 / 20

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

PGDATA

PGTIPS

PGBASE

PGCORE

12 / 20

12. Which of below are predefined schemas?

choose 2

public

pg_catalog

system

postgres

13 / 20

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

False

True

14 / 20

14. What is the purpose of the template1 database?

a template for all the other databases

regular database that you can use at your discretion

No such database

database used for temporary tables

15 / 20

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

obj#

oid#

obj

oid

16 / 20

16. What is the purpose of the template0 database?

No such database

Useful for creating development schemas

Useful for Postgres support Services to debug issues

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

17 / 20

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

Dan Brown

Paul Sammy

Sam Altman

Egor Rogov

18 / 20

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

False

True

19 / 20

19. Which of below are predefined schemas?

choose 3

pg_temp

pg_schema

information_schema

pg_toast

20 / 20

20. A single Postgres Instance can server only 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. The more locks a transaction acquires, the better it is isolated from other transactions?

True

False

2 / 10

2. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Random Scatter

Rollback Read

Serializable

3 / 10

3. A phantom read anomaly occurs when?

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 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 adds some other rows satisfying this condition and commits.

4 / 10

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

choose 3

Read Uncommitted

Serializable

Read Committed

Repeatable Read

5 / 10

5. 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 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.

A transaction reads one and the same row once and modifies this row and commits the change.

6 / 10

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

True

False

7 / 10

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

Serializable

Read Uncommitted

Repeatable Read

Read Committed

8 / 10

8. The SQL standard specifies three isolation levels?

True

False

9 / 10

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

HIPPA

ACID

SAFE

SOC2

10 / 10

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

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?

sequential number

xmin

backend process ID

checksum

2 / 10

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

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

Also know as the pages table of contents

Each pointer uses 8 bytes

3 / 10

3. The page header is located in the highest address?

True

False

4 / 10

4. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/subtrans

PGDATA/pg_subtrans

PGDATA/pg_min

5 / 10

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

False

True

6 / 10

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

True

False

7 / 10

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

True

False

8 / 10

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

True

False

9 / 10

9. CLOG Pages are never cached in memory?

False

True

10 / 10

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

temporary XID

magic XID

virtual XID

heap XID

Your score is

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