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. Users should not modify the template0 database

False

True

2 / 20

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

True

False

3 / 20

3. How many files or forks on disk will a 10Mb table with no index have?

4 / 20

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

TOAST

BREAD

BAKE

GROW

5 / 20

5. TOAST tables reside in a seperate schema?

True

False

6 / 20

6. What is the purpose of the postgres database?

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

No such database

regular database that you can use at your discretion

a template for all the other database

7 / 20

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

Sysasm Catalog

Sysaux Catalog

System Catalog

Sys Catalog

8 / 20

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

True

False

9 / 20

9. What is a schema?

Namespace that store all objects of a database

The name used to refer to a super user account

A memory area used to cache data from LRU chains

This is the same as a user in Postgres

10 / 20

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

False

True

11 / 20

11. What is the purpose of the public schema?

no such schema

default schema for user objects

schema used for heterogeneous replication

restricted schema for postgres internal usage only

12 / 20

12. System Catalog tables begin with which prefix?

sys_

dba_

pg_

cat_

13 / 20

13. The default Page size is 2k?

True

False

14 / 20

14. What is the purpose of the template1 database?

database used for temporary tables

regular database that you can use at your discretion

a template for all the other databases

No such database

15 / 20

15. What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

stores user tables that are common to the whole cluster

16 / 20

16. Files are logically split into pages?

False

True

17 / 20

17. Which of the below objects can be referred to as relations?

choose 3

tables

indexes

triggers

sequences

18 / 20

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

1GB

5MB

1MB

5GB

19 / 20

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

True

False

20 / 20

20. Postgres uses a thread based process model?

True

False

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 parameters sets the database default isolation level?

default_transaction_isolation

active_transaction_isolation

transaction_isolation_level

default_isolation_level

3 / 10

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

True

False

4 / 10

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

False

True

5 / 10

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

True

False

6 / 10

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

True

False

7 / 10

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

True

False

8 / 10

8. A phantom read anomaly occurs when?

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.

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

9 / 10

9. 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 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.

10 / 10

10. What is the default Isolation Level?

Read Committed

Repeatable Read

Read Uncommitted

Serializable

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

True

False

2 / 10

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

False

True

3 / 10

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

DELETE

CREATE

COMMIT

INSERT

4 / 10

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

True

False

5 / 10

5. status of a subtransaction is written into CLOG?

False

True

6 / 10

6. To identify different versions of one and the same row, PostgreSQL marks each of them with which two value?

xid

xmas

xmin

xmax

7 / 10

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

choose 2

free space

flashback block

page header

undo segment

8 / 10

8. indexes do not use row versioning?

False

True

9 / 10

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

pagesize

pageheadinfo

pageinspect

pagedetect

10 / 10

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

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.