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. The default Page size is 2k?

False

True

2 / 20

2. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

sysaux

postgres

template1

3 / 20

3. Postgres by default has built in connection pooling abilities?

False

True

4 / 20

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

False

True

5 / 20

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

False

True

6 / 20

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

True

False

7 / 20

7. What is the name of the system catalog table for relations?

pg_class

pg_system

pg_tables

pg_catalog

8 / 20

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

5MB

1MB

1GB

5GB

9 / 20

9. TOAST tables reside in a seperate schema?

True

False

10 / 20

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

11 / 20

11. Postgres server spawns a new backend session for each connection?

True

False

12 / 20

12. Each Database has its own System Catalog?

True

False

13 / 20

13. System Catalog tables begin with which prefix?

cat_

dba_

pg_

sys_

14 / 20

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

PGTIPS

PGBASE

PGDATA

PGCORE

15 / 20

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

postgres

postman

init

pginit

16 / 20

16. Files are logically split into pages?

True

False

17 / 20

17. Users should not modify the template0 database

True

False

18 / 20

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

False

True

19 / 20

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

True

False

20 / 20

20. What is the point of the pg_global tablespace?

stores WAL logs used for global replication

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores user tables that are common to the whole cluster

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. What is the default Isolation Level?

Serializable

Read Committed

Read Uncommitted

Repeatable Read

2 / 10

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

False

True

3 / 10

3. 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.

4 / 10

4. Which parameters sets the database default isolation level?

default_transaction_isolation

transaction_isolation_level

default_isolation_level

active_transaction_isolation

5 / 10

5. What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

Use a single SQL operator

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

6 / 10

6. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Serializable

Random Scatter

7 / 10

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

ACID

SOC2

HIPPA

SAFE

8 / 10

8. A phantom read anomaly occurs when?

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

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.

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.

9 / 10

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

Read Uncommitted

Read Committed

Repeatable Read

Serializable

10 / 10

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

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. Tuples can also be referred to as columns?

False

True

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

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

False

True

5 / 10

5. Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_min

PGDATA/pg_xid

PGDATA/pg_subtrans

6 / 10

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

COMMIT

DELETE

INSERT

CREATE

7 / 10

7. CLOG Pages are never cached in memory?

False

True

8 / 10

8. CLOG contains how many bits for each transaction?

9 / 10

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

False

True

10 / 10

10. Page free space can often become fragmented?

True

False

Your score is

Cookie	Duration	Description
cookielawinfo-checkbox-analytics	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional	11 months	The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy	11 months	The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.