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

Postgres by default has built in connection pooling abilities?

False

True

2 / 20

The default Page size is 2k?

True

False

3 / 20

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

False

True

4 / 20

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

choose 2

pg_temp

pg_default

pg_global

pg_tablespace

5 / 20

Postgres uses a thread based process model?

True

False

6 / 20

It is the postmasters job to listener for incoming connections?

True

False

7 / 20

What is the purpose of autovacuum?

Performs a backup of WAL logs

Rebuilds indexes with b level greater than 2

Removes stale data from tables and indexes

Deletes old logs and traces on disk

8 / 20

The information_schema schema provides information on Postgres release notes?

True

False

9 / 20

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

visiblilty map

free space map

table map

Main fork

10 / 20

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

11 / 20

Each tablespaces can only be assigned for use by one database

False

True

12 / 20

Tablespaces are used to define physical data layout?

False

True

13 / 20

What is the purpose of wal writer?

writes WAL entries to disk

collects usage statistics for the instance.

executes checkpoints

flushes dirty pages to disk.

14 / 20

What is the purpose of the postgres database?

regular database that you can use at your discretion

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

No such database

a template for all the other database

15 / 20

Which fork is specific for unlogged tables?

visiblilty map

Initialization fork

free space map

Main fork

16 / 20

Users should not modify the template0 database

False

True

17 / 20

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

GROW

BAKE

BREAD

TOAST

18 / 20

What is the purpose of the template0 database?

Useful for creating development schemas

No such database

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

Useful for Postgres support Services to debug issues

19 / 20

pg_catalog schema is used to store system catalog tables?

False

True

20 / 20

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

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

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

ACID

SAFE

SOC2

HIPPA

2 / 10

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

Serializable

Repeatable Read

Read Committed

Read Uncommitted

3 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

4 / 10

Which parameters sets the database default isolation level?

default_isolation_level

transaction_isolation_level

default_transaction_isolation

active_transaction_isolation

5 / 10

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

True

False

6 / 10

The SQL standard specifies three isolation levels?

True

False

7 / 10

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

True

False

8 / 10

Which of the below are valid Isolations Levels?

choose 2

Serializable

Read Committed

Random Scatter

Rollback Read

9 / 10

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

False

True

10 / 10

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.

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 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

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

psql provides a special mode that allows you to continue a transaction after a failure?

True

False

2 / 10

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

Also know as the pages table of contents

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

Each pointer uses 8 bytes

3 / 10

Tuples can also be referred to as columns?

True

False

4 / 10

The page Special Space is located at the start of the page with highest address

True

False

5 / 10

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

archive log

transaction log

redo log

commit log

6 / 10

CLOG contains how many bits for each transaction?

7 / 10

Which 2 of the below represent transaction IDs used for row versioning?

xmax

xtime

xmin

xid

8 / 10

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

True

False

9 / 10

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

True

False

10 / 10

indexes do not use row versioning?

True

False

Your score is

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