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 name of the system catalog table for relations?

pg_tables

pg_system

pg_catalog

pg_class

2 / 20

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

rollback segments (RBS)

undo segments (UNDO)

online redo logs (ORL)

write-ahead log (WAL)

3 / 20

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

CreateCluster

StartNewPG

Initialize

CreatePGC

4 / 20

4. What is the purpose of the public schema?

schema used for heterogeneous replication

restricted schema for postgres internal usage only

no such schema

default schema for user objects

5 / 20

5. Postgres server spawns a new backend session for each connection?

False

True

6 / 20

6. System Catalog tables begin with which prefix?

cat_

pg_

sys_

dba_

7 / 20

7. What is the process first launched at server start?

postgres

postman

init

pginit

8 / 20

8. What is a schema?

This is the same as a user in Postgres

Namespace that store all objects of a database

The name used to refer to a super user account

A memory area used to cache data from LRU chains

9 / 20

9. A single Postgres Instance can server only one database?

False

True

10 / 20

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

table map

Main fork

visiblilty map

free space map

11 / 20

11. Which fork is specific for unlogged tables?

Main fork

free space map

Initialization fork

visiblilty map

12 / 20

12. What is the purpose of the template0 database?

Useful for creating development schemas

No such database

Useful for Postgres support Services to debug issues

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

13 / 20

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

True

False

14 / 20

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

15 / 20

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

False

True

16 / 20

16. Tablespaces are used to define physical data layout?

False

True

17 / 20

17. Postgres uses a thread based process model?

False

True

18 / 20

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

True

False

19 / 20

19. The default Page size is 2k?

False

True

20 / 20

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

Choose 2 option

Instance

Quorum

Postgres Server

Aurora

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. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Random Scatter

Serializable

Rollback Read

2 / 10

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

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

a session being able to see commited 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

3 / 10

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

False

True

4 / 10

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

False

True

5 / 10

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

False

True

6 / 10

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

Read Uncommitted

Read Committed

Repeatable Read

Serializable

7 / 10

7. A phantom read anomaly occurs when?

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

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.

8 / 10

8. 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 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 issue a rollback.

9 / 10

9. Which parameters sets the database default isolation level?

default_transaction_isolation

default_isolation_level

active_transaction_isolation

transaction_isolation_level

10 / 10

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

SAFE

ACID

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

Each pointer uses 8 bytes

stored in PGDATA/itemptr directory

Also know as the pages table of contents

Each pointer uses 4 bytes

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

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

COMMIT

DELETE

MERGE

INSERT

5 / 10

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

True

False

6 / 10

6. What does an Item Pointer contain?

choose 3

tuple length

tuple offset from the start of the page

tuple xid

tuple status

7 / 10

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

pg_current_id()

pg_current_xmin_id()

pg_current_commit_id()

pg_current_xact_id()

8 / 10

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

heap XID

magic XID

temporary XID

virtual XID

9 / 10

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

True

False

10 / 10

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

False

True

Your score is

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