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

What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

2 / 20

What is the purpose of the visibility map?

provides an audit trail for the database

shows referential relationships for tables

shows a page to be vacuumed or frozen

provides the data decryption key

3 / 20

It is the postmasters job to listener for incoming connections?

False

True

4 / 20

What is another name for the postgres process?

postmaster

aurora

postmanager

masterprocess

5 / 20

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

GROW

TOAST

BAKE

BREAD

6 / 20

What column in system catalogs servers as the Primary Key

obj#

oid#

oid

obj

7 / 20

What is the purpose of autovacuum?

Deletes old logs and traces on disk

Removes stale data from tables and indexes

Performs a backup of WAL logs

Rebuilds indexes with b level greater than 2

8 / 20

Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

sysaux

template1

postgres

9 / 20

Files are logically split into pages?

False

True

10 / 20

To be able to restore data consistency, Postgres maintains

online redo logs (ORL)

undo segments (UNDO)

write-ahead log (WAL)

rollback segments (RBS)

11 / 20

Each tablespaces can only be assigned for use by one database

False

True

12 / 20

Which of below are predefined schemas?

choose 2

system

pg_catalog

postgres

public

13 / 20

A schema can belong to more than one database?

True

False

14 / 20

The information_schema schema provides information on Postgres release notes?

False

True

15 / 20

What command is used to create the Postgres cluster?

CreatePGC

StartNewPG

CreateCluster

Initialize

16 / 20

Postgres uses a thread based process model?

True

False

17 / 20

A single Postgres Instance can server only one database?

True

False

18 / 20

What is the purpose of wal writer?

executes checkpoints

collects usage statistics for the instance.

writes WAL entries to disk

flushes dirty pages to disk.

19 / 20

Postgres by default has built in connection pooling abilities?

False

True

20 / 20

TOAST tables reside in a seperate schema?

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

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

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

2 / 10

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

choose 3

Serializable

Repeatable Read

Read Committed

Read Uncommitted

3 / 10

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

HIPPA

ACID

SAFE

SOC2

4 / 10

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

True

False

5 / 10

Which of the below would best describe a dirty read?

reading data direct from memory using pg_dirt

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

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

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

6 / 10

What is the default Isolation Level?

Read Uncommitted

Repeatable Read

Serializable

Read Committed

7 / 10

non-repeatable read anomaly occurs when?

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.

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.

8 / 10

Which parameters sets the database default isolation level?

default_transaction_isolation

default_isolation_level

active_transaction_isolation

transaction_isolation_level

9 / 10

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

False

True

10 / 10

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

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

UPDATE can be regarded as which 2 separate operations?

COMMIT

MERGE

DELETE

INSERT

2 / 10

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

True

False

3 / 10

indexes do not use row versioning?

False

True

4 / 10

Which 2 items does a Virtual XID consist of?

sequential number

xmin

backend process ID

checksum

5 / 10

The page header is located in the highest address?

True

False

6 / 10

status of a subtransaction is written into CLOG?

True

False

7 / 10

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

archive log

redo log

transaction log

commit log

8 / 10

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

True

False

9 / 10

CLOG contains how many bits for each transaction?

10 / 10

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

xmas

xid

xmax

xmin

Your score is

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