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

Files are logically split into pages?

False

True

2 / 20

Which fork keeps track of available space within pages?

free space map

vacuum space map

wal space map

used space map

3 / 20

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

free space map

table map

Main fork

visiblilty map

4 / 20

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

PGCORE

PGBASE

PGDATA

PGTIPS

5 / 20

If we create a new tablespace which directory will symbolic links be created from?

pg_tblspc

pg_symlinks

pg_tablespace

pg_tabspace

6 / 20

What is the name of the catalog that stores metadata for all cluster objects?

System Catalog

Sysasm Catalog

Sys Catalog

Sysaux Catalog

7 / 20

Each tablespaces can only be assigned for use by one database

True

False

8 / 20

What is the purpose of the public schema?

schema used for heterogeneous replication

restricted schema for postgres internal usage only

default schema for user objects

no such schema

9 / 20

System Catalog tables begin with which prefix?

cat_

sys_

pg_

dba_

10 / 20

The information_schema schema provides information on Postgres release notes?

False

True

11 / 20

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

BAKE

GROW

TOAST

BREAD

12 / 20

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

False

True

13 / 20

What command is used to create the Postgres cluster?

CreatePGC

Initialize

StartNewPG

CreateCluster

14 / 20

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

True

False

15 / 20

Which fork contains the actual table data?

free space map

visiblilty map

Main fork

table map

16 / 20

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

pg_system

pg_catalog

pg_tables

pg_class

17 / 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

18 / 20

It is the postmasters job to listener for incoming connections?

False

True

19 / 20

TOAST tables reside in a seperate schema?

True

False

20 / 20

Which fork is specific for unlogged tables?

Main fork

Initialization fork

free space map

visiblilty map

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 would best describe a dirty read?

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

reading data direct from memory using pg_dirt

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

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

2 / 10

non-repeatable read anomaly occurs when?

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 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 and modifies this row and commits the change.

3 / 10

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

False

True

4 / 10

What is the default Isolation Level?

Serializable

Read Uncommitted

Repeatable Read

Read Committed

5 / 10

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

True

False

6 / 10

The SQL standard specifies three isolation levels?

True

False

7 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

8 / 10

Which parameters sets the database default isolation level?

default_isolation_level

transaction_isolation_level

default_transaction_isolation

active_transaction_isolation

9 / 10

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

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

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

pageheadinfo

pageinspect

pagedetect

pagesize

2 / 10

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

False

True

3 / 10

The page header is located in the highest address?

False

True

4 / 10

Each page has a layer that usually consists of?

choose 2

free space

page header

undo segment

flashback block

5 / 10

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

xmin

xmas

xid

xmax

6 / 10

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

pg_current_xact_id()

pg_current_commit_id()

pg_current_id()

pg_current_xmin_id()

7 / 10

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

True

False

8 / 10

Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_xid

PGDATA/pg_subtrans

PGDATA/pg_min

9 / 10

indexes do not use row versioning?

True

False

10 / 10

status of a subtransaction is written into CLOG?

False

True

Your score is

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