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 is another name for the postgres process?

postmanager

masterprocess

aurora

postmaster

2 / 20

2. What command is used to create the Postgres cluster?

Initialize

CreateCluster

StartNewPG

CreatePGC

3 / 20

3. What is the purpose of the template1 database?

regular database that you can use at your discretion

database used for temporary tables

No such database

a template for all the other databases

4 / 20

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

pg_tablespace

pg_tabspace

pg_tblspc

pg_symlinks

5 / 20

5. What 3 files/forks as a minimum make up a table on disk?

table map

Main fork

visiblilty map

free space map

6 / 20

6. Tablespaces are used to define physical data layout?

False

True

7 / 20

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

False

True

8 / 20

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

9 / 20

9. Which fork is specific for unlogged tables?

free space map

visiblilty map

Initialization fork

Main fork

10 / 20

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

5MB

1GB

1MB

5GB

11 / 20

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

Dan Brown

Sam Altman

Paul Sammy

Egor Rogov

12 / 20

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

vacuum space map

wal space map

used space map

free space map

13 / 20

13. Which of below are predefined schemas?

choose 2

pg_catalog

postgres

system

public

14 / 20

14. What is the name of the system catalog table for relations?

pg_tables

pg_catalog

pg_class

pg_system

15 / 20

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

True

False

16 / 20

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

False

True

17 / 20

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

False

True

18 / 20

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

Sysasm Catalog

Sys Catalog

System Catalog

Sysaux Catalog

19 / 20

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

oid#

oid

obj#

obj

20 / 20

20. Postgres by default has built in connection pooling abilities?

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. non-repeatable read anomaly occurs when?

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.

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

2 / 10

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

False

True

3 / 10

3. Which parameters sets the database default isolation level?

default_isolation_level

active_transaction_isolation

default_transaction_isolation

transaction_isolation_level

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?

False

True

6 / 10

6. which of the below statements will start a transaction as Read Repeatable?

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

7 / 10

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

False

True

8 / 10

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

ACID

SAFE

SOC2

HIPPA

9 / 10

9. 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

10 / 10

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

Select more than 1 answer below:

Replace procedural code with declarative one.

Use a single SQL operator

Apply explicit locks

Issues a rollback after the commit to satisfy 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. To identify different versions of one and the same row, PostgreSQL marks each of them with which two value?

xmas

xid

xmin

xmax

2 / 10

2. CLOG files are stored in which directory?

PGDATA/pg_xact

PGDATA/pg_commit

PGDATA/pg_clog

PGDATA/clog

3 / 10

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

True

False

4 / 10

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

clog

heap

dump

view

5 / 10

5. at any one time Postgres can have several versions of a row?

False

True

6 / 10

6. indexes do not use row versioning?

True

False

7 / 10

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

False

True

8 / 10

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

CREATE

COMMIT

DELETE

INSERT

9 / 10

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

checksum

sequential number

backend process ID

xmin

10 / 10

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

pg_current_commit_id()

pg_current_xmin_id()

pg_current_xact_id()

pg_current_id()

Your score is

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