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. What command is used to create the Postgres cluster?

StartNewPG

CreatePGC

CreateCluster

Initialize

2 / 20

2. What is another name for the postgres process?

masterprocess

aurora

postmaster

postmanager

3 / 20

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

choose 3

triggers

indexes

sequences

tables

4 / 20

4. Users should not modify the template0 database

False

True

5 / 20

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

Dan Brown

Egor Rogov

Paul Sammy

Sam Altman

6 / 20

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

oid#

obj#

obj

oid

7 / 20

7. Which fork contains the actual table data?

visiblilty map

free space map

table map

Main fork

8 / 20

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

False

True

9 / 20

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

choose 2

pg_default

pg_temp

pg_tablespace

pg_global

10 / 20

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

GROW

BREAD

TOAST

BAKE

11 / 20

11. What is a schema?

The name used to refer to a super user account

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

Namespace that store all objects of a database

12 / 20

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

pg_tblspc

pg_symlinks

pg_tablespace

pg_tabspace

13 / 20

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

True

False

14 / 20

14. Tablespaces are used to define physical data layout?

False

True

15 / 20

15. What is the purpose of the public schema?

default schema for user objects

schema used for heterogeneous replication

restricted schema for postgres internal usage only

no such schema

16 / 20

16. Files are logically split into pages?

True

False

17 / 20

17. The default Page size is 2k?

False

True

18 / 20

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

System Catalog

Sys Catalog

Sysasm Catalog

Sysaux Catalog

19 / 20

19. Which of below are predefined schemas?

choose 3

pg_toast

pg_schema

information_schema

pg_temp

20 / 20

20. What is the purpose of autovacuum?

Rebuilds indexes with b level greater than 2

Performs a backup of WAL logs

Deletes old logs and traces on disk

Removes stale data from tables and indexes

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?

Read Uncommitted

Read Committed

Serializable

Repeatable Read

2 / 10

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

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

Use a single SQL operator

Replace procedural code with declarative one.

3 / 10

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

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

reading data direct from memory using pg_dirt

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

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

4 / 10

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

False

True

5 / 10

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

SAFE

ACID

SOC2

HIPPA

6 / 10

6. Which parameters sets the database default isolation level?

default_isolation_level

transaction_isolation_level

default_transaction_isolation

active_transaction_isolation

7 / 10

7. non-repeatable read anomaly occurs when?

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 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 issue a rollback.

8 / 10

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

True

False

9 / 10

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

True

False

10 / 10

10. 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

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

False

True

2 / 10

2. CLOG contains how many bits for each transaction?

3 / 10

3. Which function can we use to find the current transaction ID?

pg_current_id()

pg_current_commit_id()

pg_current_xact_id()

pg_current_xmin_id()

4 / 10

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

False

True

5 / 10

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

False

True

6 / 10

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

False

True

7 / 10

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

False

True

8 / 10

8. CLOG Pages are never cached in memory?

False

True

9 / 10

9. indexes do not use row versioning?

False

True

10 / 10

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

True

False

Your score is

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