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. Tablespaces are used to define physical data layout?

True

False

2 / 20

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

True

False

3 / 20

3. What is the name of the 2 default tablespaces created after initialization?

choose 2

pg_temp

pg_default

pg_tablespace

pg_global

4 / 20

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

Sam Altman

Paul Sammy

Dan Brown

Egor Rogov

5 / 20

5. Postgres uses a thread based process model?

True

False

6 / 20

6. Which fork keeps track of available space within pages?

vacuum space map

free space map

wal space map

used space map

7 / 20

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

False

True

8 / 20

8. Which of below are predefined schemas?

choose 3

pg_temp

information_schema

pg_schema

pg_toast

9 / 20

9. Files are logically split into pages?

True

False

10 / 20

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

System Catalog

Sysaux Catalog

Sysasm Catalog

Sys Catalog

11 / 20

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

undo segments (UNDO)

write-ahead log (WAL)

online redo logs (ORL)

rollback segments (RBS)

12 / 20

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

Schema Path

Search Path

Access Path

Directory Path

13 / 20

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

obj

oid

obj#

oid#

14 / 20

14. Each Database has its own System Catalog?

True

False

15 / 20

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

True

False

16 / 20

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

choose 3

sequences

triggers

tables

indexes

17 / 20

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

True

False

18 / 20

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

init

pginit

postgres

postman

19 / 20

19. Which fork contains the actual table data?

Main fork

visiblilty map

free space map

table map

20 / 20

20. Each tablespaces can only be assigned for use by 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. What is the default Isolation Level?

Repeatable Read

Read Uncommitted

Read Committed

Serializable

2 / 10

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

False

True

3 / 10

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

False

True

4 / 10

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

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. A phantom read anomaly occurs when?

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.

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.

7 / 10

7. 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

Replace procedural code with declarative one.

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

8 / 10

8. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Serializable

Random Scatter

Read Committed

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

Read Uncommitted

Serializable

Read Committed

Repeatable Read

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. CLOG contains how many bits for each transaction?

2 / 10

2. indexes do not use row versioning?

True

False

3 / 10

3. Tuples can also be referred to as columns?

True

False

4 / 10

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

True

False

5 / 10

5. Page free space can often become fragmented?

True

False

6 / 10

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

xmin

sequential number

checksum

backend process ID

7 / 10

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

True

False

8 / 10

8. Indexes values also support multi versioning with several versions of an index value existing at any point in time?

False

True

9 / 10

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

False

True

10 / 10

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

pagedetect

pagesize

pageinspect

pageheadinfo

Your score is

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