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. Postgres by default has built in connection pooling abilities?

True

False

2 / 20

2. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

3 / 20

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

Egor Rogov

Dan Brown

Sam Altman

Paul Sammy

4 / 20

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

False

True

5 / 20

5. To understand each other, a client and a server must use one and the same interfacing protocol?

False

True

6 / 20

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

1GB

1MB

5MB

5GB

7 / 20

7. What is the purpose of wal writer?

writes WAL entries to disk

executes checkpoints

collects usage statistics for the instance.

flushes dirty pages to disk.

8 / 20

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

True

False

9 / 20

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

False

True

10 / 20

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

11 / 20

11. Each tablespaces can only be assigned for use by one database

True

False

12 / 20

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

False

True

13 / 20

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

rollback segments (RBS)

undo segments (UNDO)

write-ahead log (WAL)

online redo logs (ORL)

14 / 20

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

System Catalog

Sys Catalog

Sysaux Catalog

Sysasm Catalog

15 / 20

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

True

False

16 / 20

16. What is the purpose of autovacuum?

Removes stale data from tables and indexes

Rebuilds indexes with b level greater than 2

Performs a backup of WAL logs

Deletes old logs and traces on disk

17 / 20

17. Which of below are predefined schemas?

choose 2

public

pg_catalog

system

postgres

18 / 20

18. What is the purpose of the visibility map?

shows referential relationships for tables

provides the data decryption key

shows a page to be vacuumed or frozen

provides an audit trail for the database

19 / 20

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

choose 3

sequences

tables

indexes

triggers

20 / 20

20. TOAST tables reside in a seperate schema?

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

Rollback Read

Random Scatter

Serializable

Read Committed

2 / 10

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

choose 3

Read Uncommitted

Read Committed

Repeatable Read

Serializable

3 / 10

3. Which parameters sets the database default isolation level?

active_transaction_isolation

default_isolation_level

transaction_isolation_level

default_transaction_isolation

4 / 10

4. 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.

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.

A transactions inserts a null value into a not null columns and commits

5 / 10

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

True

False

6 / 10

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

HIPPA

ACID

SOC2

SAFE

7 / 10

7. Which of the below would best describe a dirty read?

reading the data directly from file using a text editor such as vi or notepad

reading data direct from memory using pg_dirt

a session being able to see uncommited data altered by another session

a session being able to see commited data altered by another session

8 / 10

8. 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 issue a rollback.

A transaction reads one and the same row twice, another transaction modifies this row between these reads and commits the change.

9 / 10

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

False

True

10 / 10

10. The SQL standard specifies three isolation levels?

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

True

False

2 / 10

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

choose 2

flashback block

free space

undo segment

page header

3 / 10

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

False

True

4 / 10

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

True

False

5 / 10

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

xmin

backend process ID

checksum

sequential number

6 / 10

6. Rows of TOAST tables are handled in such a way that they are never update?

False

True

7 / 10

7. Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_xid

PGDATA/pg_min

PGDATA/pg_subtrans

8 / 10

8. Which 2 of the below represent transaction IDs used for row versioning?

xmax

xtime

xmin

xid

9 / 10

9. In Postgres, tables are often referred to as which of the below?

dump

view

heap

clog

10 / 10

10. indexes do not use row versioning?

False

True

Your score is

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