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 public schema?

restricted schema for postgres internal usage only

no such schema

schema used for heterogeneous replication

default schema for user objects

2 / 20

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

Choose 2 option

Aurora

Postgres Server

Instance

Quorum

3 / 20

3. What is the purpose of the postgres database?

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

No such database

a template for all the other database

regular database that you can use at your discretion

4 / 20

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

choose 3

sequences

tables

triggers

indexes

5 / 20

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

Sam Altman

Egor Rogov

Dan Brown

Paul Sammy

6 / 20

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

False

True

7 / 20

7. The default Page size is 2k?

False

True

8 / 20

8. The pg_default tablespace should never be used to create user tables?

True

False

9 / 20

9. What is the purpose of the template1 database?

database used for temporary tables

No such database

a template for all the other databases

regular database that you can use at your discretion

10 / 20

10. System Catalog tables begin with which prefix?

dba_

pg_

sys_

cat_

11 / 20

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

True

False

12 / 20

12. Postgres uses a thread based process model?

False

True

13 / 20

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

BAKE

GROW

BREAD

TOAST

14 / 20

14. What is a schema?

Namespace that store all objects of a database

This is the same as a user in Postgres

The name used to refer to a super user account

A memory area used to cache data from LRU chains

15 / 20

15. Which fork is specific for unlogged tables?

visiblilty map

Main fork

Initialization fork

free space map

16 / 20

16. What is the point of the pg_global tablespace?

stores user tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

17 / 20

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

False

True

18 / 20

18. What is another name for the postgres process?

postmaster

masterprocess

postmanager

aurora

19 / 20

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

System Catalog

Sysaux Catalog

Sys Catalog

Sysasm Catalog

20 / 20

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

False

True

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. 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 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.

The same transactions issues a commit, then a rollback to restore data to its original value

A transactions inserts a null value into a not null columns and commits

2 / 10

2. What is the default Isolation Level?

Serializable

Repeatable Read

Read Committed

Read Uncommitted

3 / 10

3. The SQL standard specifies three isolation levels?

True

False

4 / 10

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

Serializable

Read Uncommitted

Read Committed

Repeatable Read

5 / 10

5. Data Consistency is best handled at the application layer rather than at the database layer?

True

False

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

Select more than 1 answer below:

Apply explicit locks

Use a single SQL operator

Replace procedural code with declarative one.

Issues a rollback after the commit to satisfy repeatable read.

8 / 10

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

reading data direct from memory using pg_dirt

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

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

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

9 / 10

9. 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.

10 / 10

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

ACID

SAFE

HIPPA

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. CLOG files are stored in which directory?

PGDATA/clog

PGDATA/pg_commit

PGDATA/pg_xact

PGDATA/pg_clog

2 / 10

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

xid

xmin

xmas

xmax

3 / 10

3. a transaction containing a savepoint is will still be considered as only a single transaction?

True

False

4 / 10

4. CLOG contains how many bits for each transaction?

5 / 10

5. If a transaction is read only which kind of Transaction ID is it allocated?

heap XID

magic XID

temporary XID

virtual XID

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

True

False

8 / 10

8. Which of the below are true about a Pages Item Pointer?

Also know as the pages table of contents

Each pointer uses 8 bytes

Each pointer uses 4 bytes

stored in PGDATA/itemptr directory

9 / 10

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

False

True

10 / 10

10. When a transaction is committed Postgres uses a special <replace with answer> structure?

redo log

commit log

archive log

transaction log

Your score is

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