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 a schema?

Namespace that store all objects of a database

A memory area used to cache data from LRU chains

This is the same as a user in Postgres

The name used to refer to a super user account

2 / 20

TOAST tables reside in a seperate schema?

False

True

3 / 20

The information_schema schema provides information on Postgres release notes?

True

False

4 / 20

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

TOAST

BREAD

BAKE

GROW

5 / 20

Which of below are predefined schemas?

choose 2

postgres

pg_catalog

public

system

6 / 20

System Catalog tables begin with which prefix?

pg_

cat_

sys_

dba_

7 / 20

Who is the Author of the Postgres 14 Internals book?

Sam Altman

Egor Rogov

Dan Brown

Paul Sammy

8 / 20

What is another name for the postgres process?

aurora

postmanager

postmaster

masterprocess

9 / 20

What is the purpose of the visibility map?

shows referential relationships for tables

provides the data decryption key

provides an audit trail for the database

shows a page to be vacuumed or frozen

10 / 20

Which fork keeps track of available space within pages?

used space map

free space map

wal space map

vacuum space map

11 / 20

Which fork contains the actual table data?

Main fork

visiblilty map

table map

free space map

12 / 20

Which of below are predefined schemas?

choose 3

pg_toast

information_schema

pg_schema

pg_temp

13 / 20

What is the purpose of autovacuum?

Performs a backup of WAL logs

Rebuilds indexes with b level greater than 2

Deletes old logs and traces on disk

Removes stale data from tables and indexes

14 / 20

What is the default standard size for a fork file?

1GB

5MB

1MB

5GB

15 / 20

What is the purpose of the postgres database?

a template for all the other 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

16 / 20

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

pg_tabspace

pg_symlinks

pg_tblspc

pg_tablespace

17 / 20

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

pg_catalog

pg_class

pg_system

pg_tables

18 / 20

What is the purpose of the public schema?

no such schema

restricted schema for postgres internal usage only

schema used for heterogeneous replication

default schema for user objects

19 / 20

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

False

True

20 / 20

Which fork is specific for unlogged tables?

free space map

Main fork

Initialization fork

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

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

SOC2

ACID

SAFE

HIPPA

2 / 10

What is the default Isolation Level?

Read Committed

Serializable

Read Uncommitted

Repeatable Read

3 / 10

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

False

True

4 / 10

Which of the below would best describe a dirty read?

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

reading data direct from memory using pg_dirt

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

5 / 10

A phantom read anomaly occurs when?

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 also queries this same data.

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

6 / 10

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

Serializable

Read Uncommitted

Repeatable Read

Read Committed

7 / 10

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

choose 3

Repeatable Read

Serializable

Read Uncommitted

Read Committed

8 / 10

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

True

False

9 / 10

Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Random Scatter

Serializable

10 / 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.

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

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

True

False

2 / 10

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

True

False

3 / 10

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

archive log

transaction log

commit log

redo log

4 / 10

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

True

False

5 / 10

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

True

False

6 / 10

A page along with its tuples is read into the buffer cache with compression transformations to enhance cache efficiency?

False

True

7 / 10

What does an Item Pointer contain?

choose 3

tuple xid

tuple status

tuple length

tuple offset from the start of the page

8 / 10

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

True

False

9 / 10

Tuples can also be referred to as columns?

True

False

10 / 10

CLOG files are stored in which directory?

PGDATA/pg_commit

PGDATA/pg_xact

PGDATA/pg_clog

PGDATA/clog

Your score is

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