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

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

2 / 20

What is another name for the postgres process?

postmanager

aurora

masterprocess

postmaster

3 / 20

TOAST tables reside in a seperate schema?

True

False

4 / 20

Which fork is specific for unlogged tables?

Initialization fork

Main fork

visiblilty map

free space map

5 / 20

Postgres uses a thread based process model?

False

True

6 / 20

Which of below are predefined schemas?

choose 2

system

postgres

public

pg_catalog

7 / 20

Postgres server spawns a new backend session for each connection?

False

True

8 / 20

What is the name of the 2 default tablespaces created after initialization?

choose 2

pg_temp

pg_global

pg_default

pg_tablespace

9 / 20

Users should not modify the template0 database

True

False

10 / 20

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

Choose 2 option

Instance

Quorum

Aurora

Postgres Server

11 / 20

What is the purpose of the visibility map?

provides an audit trail for the database

shows a page to be vacuumed or frozen

provides the data decryption key

shows referential relationships for tables

12 / 20

Postgres by default has built in connection pooling abilities?

True

False

13 / 20

Which 3 databases exist directly after cluster initialization?

choose 3 options

template1

template0

sysaux

postgres

14 / 20

Which fork keeps track of available space within pages?

used space map

vacuum space map

wal space map

free space map

15 / 20

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

PGBASE

PGCORE

PGTIPS

PGDATA

16 / 20

What is the purpose of autovacuum?

Rebuilds indexes with b level greater than 2

Performs a backup of WAL logs

Deletes old logs and traces on disk

Removes stale data from tables and indexes

17 / 20

Which of below are predefined schemas?

choose 3

pg_temp

information_schema

pg_schema

pg_toast

18 / 20

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

False

True

19 / 20

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

pg_class

pg_tables

pg_system

pg_catalog

20 / 20

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

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

Which of the below are valid Isolations Levels?

choose 2

Read Committed

Serializable

Random Scatter

Rollback Read

2 / 10

A phantom read anomaly occurs when?

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 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.

3 / 10

Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

active_transaction_isolation

default_isolation_level

4 / 10

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

False

True

5 / 10

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

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

6 / 10

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

False

True

7 / 10

The SQL standard specifies three isolation levels?

True

False

8 / 10

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

False

True

9 / 10

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

False

True

10 / 10

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

False

True

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

Which 2 items does a Virtual XID consist of?

xmin

backend process ID

sequential number

checksum

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

UPDATE can be regarded as which 2 separate operations?

INSERT

MERGE

COMMIT

DELETE

5 / 10

CLOG contains how many bits for each transaction?

6 / 10

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

False

True

7 / 10

CLOG Pages are never cached in memory?

True

False

8 / 10

Page free space can often become fragmented?

False

True

9 / 10

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

False

True

10 / 10

indexes do not use row versioning?

True

False

Your score is

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