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 purpose of the visibility map?

shows a page to be vacuumed or frozen

provides an audit trail for the database

provides the data decryption key

shows referential relationships for tables

2 / 20

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

Egor Rogov

Dan Brown

Paul Sammy

Sam Altman

3 / 20

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

vacuum space map

wal space map

free space map

used space map

4 / 20

4. System Catalog tables begin with which prefix?

dba_

cat_

sys_

pg_

5 / 20

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

True

False

6 / 20

6. How many rows in a page does Postgres aim to have before considering TOAST?

7 / 20

7. What is the name of the directory that contains the files related to the Postgres cluster?

PGTIPS

PGBASE

PGCORE

PGDATA

8 / 20

8. A Postgres cluster consists of 2 or more physical servers accessing one Postgres Instance?

True

False

9 / 20

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

False

True

10 / 20

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

True

False

11 / 20

11. TOAST tables reside in a seperate schema?

True

False

12 / 20

12. Users should not modify the template0 database

True

False

13 / 20

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

True

False

14 / 20

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

False

True

15 / 20

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

pg_tables

pg_system

pg_catalog

pg_class

16 / 20

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

17 / 20

17. What is the purpose of the public schema?

default schema for user objects

restricted schema for postgres internal usage only

schema used for heterogeneous replication

no such schema

18 / 20

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

StartNewPG

CreatePGC

CreateCluster

Initialize

19 / 20

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

BAKE

TOAST

BREAD

GROW

20 / 20

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

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 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 twice, another transaction modifies this row between these reads issue a rollback.

A transaction reads one and the same row once and modifies this row and commits the change.

2 / 10

2. 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 also queries this same data.

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

3 / 10

3. Which isolation level in theory could mean an application does not have to consider isolation anomalies?

Repeatable Read

Serializable

Read Committed

Read Uncommitted

4 / 10

4. 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.

Use a single SQL operator

Apply explicit locks

Replace procedural code with declarative one.

5 / 10

5. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Read Committed

Serializable

Rollback Read

6 / 10

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

True

False

7 / 10

7. What is the default Isolation Level?

Read Uncommitted

Repeatable Read

Serializable

Read Committed

8 / 10

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

choose 3

Read Committed

Read Uncommitted

Serializable

Repeatable Read

9 / 10

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

True

False

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. Information about subtransactions is stored under?

PGDATA/pg_min

PGDATA/subtrans

PGDATA/pg_xid

PGDATA/pg_subtrans

2 / 10

2. Page free space can often become fragmented?

True

False

3 / 10

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

True

False

4 / 10

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

heap

clog

view

dump

5 / 10

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

False

True

6 / 10

6. What does an Item Pointer contain?

choose 3

tuple length

tuple offset from the start of the page

tuple status

tuple xid

7 / 10

7. Tuples can also be referred to as columns?

True

False

8 / 10

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

xmas

xid

xmin

xmax

9 / 10

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

True

False

10 / 10

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

False

True

Your score is

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