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

Who is the Author of the Postgres 14 Internals book?

Dan Brown

Paul Sammy

Sam Altman

Egor Rogov

2 / 20

A single Postgres Instance can server only one database?

False

True

3 / 20

What is the process first launched at server start?

pginit

postman

postgres

init

4 / 20

What is the purpose of the postgres database?

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

regular database that you can use at your discretion

No such database

a template for all the other database

5 / 20

Postgres uses a thread based process model?

True

False

6 / 20

It is the postmasters job to listener for incoming connections?

False

True

7 / 20

Tablespaces are used to define physical data layout?

False

True

8 / 20

pg_catalog schema is used to store system catalog tables?

False

True

9 / 20

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

True

False

10 / 20

Which fork keeps track of available space within pages?

wal space map

used space map

free space map

vacuum space map

11 / 20

The default Page size is 2k?

True

False

12 / 20

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

BREAD

GROW

TOAST

BAKE

13 / 20

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

PGBASE

PGDATA

PGTIPS

PGCORE

14 / 20

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

False

True

15 / 20

System Catalog tables begin with which prefix?

dba_

pg_

sys_

cat_

16 / 20

What is a schema?

Namespace that store all objects of a database

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

The name used to refer to a super user account

17 / 20

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

18 / 20

What is the purpose of the public schema?

default schema for user objects

no such schema

restricted schema for postgres internal usage only

schema used for heterogeneous replication

19 / 20

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

True

False

20 / 20

What is the purpose of wal writer?

flushes dirty pages to disk.

collects usage statistics for the instance.

executes checkpoints

writes WAL entries to disk

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

The SQL standard specifies three isolation levels?

False

True

2 / 10

Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

active_transaction_isolation

default_isolation_level

3 / 10

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

False

True

4 / 10

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

True

False

5 / 10

What is the default Isolation Level?

Read Uncommitted

Read Committed

Serializable

Repeatable Read

6 / 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 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 and commits the change.

7 / 10

Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Read Committed

Serializable

Rollback Read

8 / 10

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

False

True

9 / 10

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

False

True

10 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

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

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

magic XID

temporary XID

virtual XID

heap XID

2 / 10

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

pg_current_commit_id()

pg_current_id()

pg_current_xmin_id()

pg_current_xact_id()

3 / 10

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

False

True

4 / 10

indexes do not use row versioning?

False

True

5 / 10

CLOG Pages are never cached in memory?

True

False

6 / 10

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

xmin

xid

xtime

xmax

7 / 10

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

xmax

xid

xmin

xmas

8 / 10

Page header sizes can be easily displayed using the <choose from answers> extension

pageheadinfo

pageinspect

pagesize

pagedetect

9 / 10

CLOG contains how many bits for each transaction?

10 / 10

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

commit log

transaction log

archive log

redo log

Your score is

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