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 the default standard size for a fork file?

1GB

5MB

1MB

5GB

2 / 20

2. What is another name for the postgres process?

postmaster

postmanager

aurora

masterprocess

3 / 20

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

False

True

4 / 20

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

pg_tables

pg_system

pg_catalog

pg_class

5 / 20

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

Egor Rogov

Dan Brown

Paul Sammy

Sam Altman

6 / 20

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

CreateCluster

Initialize

StartNewPG

CreatePGC

7 / 20

7. Postgres uses a thread based process model?

False

True

8 / 20

8. Which of below are predefined schemas?

choose 3

information_schema

pg_toast

pg_schema

pg_temp

9 / 20

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

Sys Catalog

Sysaux Catalog

Sysasm Catalog

System Catalog

10 / 20

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

False

True

11 / 20

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

False

True

12 / 20

12. Each Database has its own System Catalog?

False

True

13 / 20

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

rollback segments (RBS)

undo segments (UNDO)

online redo logs (ORL)

write-ahead log (WAL)

14 / 20

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

False

True

15 / 20

15. What is the purpose of wal writer?

executes checkpoints

writes WAL entries to disk

flushes dirty pages to disk.

collects usage statistics for the instance.

16 / 20

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

17 / 20

17. Users should not modify the template0 database

False

True

18 / 20

18. What is the purpose of the template1 database?

regular database that you can use at your discretion

a template for all the other databases

No such database

database used for temporary tables

19 / 20

19. Which fork contains the actual table data?

Main fork

free space map

visiblilty map

table map

20 / 20

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

wal space map

free space map

used space map

vacuum space map

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

False

True

2 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

3 / 10

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

False

True

4 / 10

4. Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

default_isolation_level

active_transaction_isolation

5 / 10

5. 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

Replace procedural code with declarative one.

Use a single SQL operator

6 / 10

6. 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.

7 / 10

7. 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 adds some other rows satisfying this condition and commits.

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 also queries this same data.

8 / 10

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

choose 3

Read Uncommitted

Repeatable Read

Serializable

Read Committed

9 / 10

9. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Serializable

Read Committed

Random Scatter

10 / 10

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

HIPPA

ACID

SAFE

SOC2

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. What does an Item Pointer contain?

choose 3

tuple length

tuple status

tuple offset from the start of the page

tuple xid

2 / 10

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

dump

heap

clog

view

3 / 10

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

choose 2

page header

free space

flashback block

undo segment

4 / 10

4. indexes do not use row versioning?

True

False

5 / 10

5. status of a subtransaction is written into CLOG?

True

False

6 / 10

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

False

True

7 / 10

7. UPDATE can be regarded as which 2 separate operations?

DELETE

MERGE

COMMIT

INSERT

8 / 10

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

backend process ID

sequential number

checksum

xmin

9 / 10

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

pageheadinfo

pageinspect

pagedetect

pagesize

10 / 10

10. If a transaction aborts, all page changes are reverted(rolled back) in place?

False

True

Your score is

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