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. TOAST tables reside in a seperate schema?

False

True

2 / 20

2. If we create a new tablespace which directory will symbolic links be created from?

pg_tabspace

pg_tblspc

pg_symlinks

pg_tablespace

3 / 20

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

used space map

vacuum space map

wal space map

free space map

4 / 20

4. Tablespaces are used to define physical data layout?

True

False

5 / 20

5. What is the purpose of the template0 database?

Useful for creating development schemas

No such database

Useful for Postgres support Services to debug issues

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

6 / 20

6. What is the purpose of autovacuum?

Deletes old logs and traces on disk

Rebuilds indexes with b level greater than 2

Performs a backup of WAL logs

Removes stale data from tables and indexes

7 / 20

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

False

True

8 / 20

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

False

True

9 / 20

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

True

False

10 / 20

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

choose 2

pg_global

pg_tablespace

pg_default

pg_temp

11 / 20

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

False

True

12 / 20

12. When PostgreSQL is running what can it be referred to as?

Choose 2 option

Quorum

Aurora

Postgres Server

Instance

13 / 20

13. Each Database has its own System Catalog?

True

False

14 / 20

14. What is the purpose of wal writer?

writes WAL entries to disk

collects usage statistics for the instance.

flushes dirty pages to disk.

executes checkpoints

15 / 20

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

False

True

16 / 20

16. Which of below are predefined schemas?

choose 3

pg_schema

pg_temp

pg_toast

information_schema

17 / 20

17. What is the purpose of the visibility map?

provides the data decryption key

shows a page to be vacuumed or frozen

shows referential relationships for tables

provides an audit trail for the database

18 / 20

18. What is the purpose of the template1 database?

a template for all the other databases

database used for temporary tables

No such database

regular database that you can use at your discretion

19 / 20

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

Directory Path

Search Path

Access Path

Schema Path

20 / 20

20. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

stores system catalog objects 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. The SQL standard specifies three isolation levels?

False

True

2 / 10

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

ACID

SOC2

HIPPA

SAFE

3 / 10

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

choose 3

Repeatable Read

Read Committed

Read Uncommitted

Serializable

4 / 10

4. A phantom read anomaly occurs when?

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

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.

5 / 10

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

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

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

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

reading data direct from memory using pg_dirt

6 / 10

6. Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

default_isolation_level

active_transaction_isolation

7 / 10

7. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Random Scatter

Serializable

Read Committed

8 / 10

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

False

True

9 / 10

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

False

True

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

DELETE

INSERT

COMMIT

CREATE

2 / 10

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

False

True

3 / 10

3. indexes do not use row versioning?

False

True

4 / 10

4. psql provides a special mode that allows you to continue a transaction after a failure?

True

False

5 / 10

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

True

False

6 / 10

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

True

False

7 / 10

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

dump

heap

clog

view

8 / 10

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

False

True

9 / 10

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

xid

xmax

xmin

xtime

10 / 10

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

xmas

xmin

xmax

xid

Your score is

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