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

System Catalog tables begin with which prefix?

cat_

dba_

pg_

sys_

2 / 20

It is the postmasters job to listener for incoming connections?

False

True

3 / 20

The default Page size is 2k?

True

False

4 / 20

Which of the below objects can be referred to as relations?

choose 3

indexes

triggers

sequences

tables

5 / 20

Each Database has its own System Catalog?

True

False

6 / 20

What is the purpose of the postgres database?

regular database that you can use at your discretion

No such database

a template for all the other database

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

7 / 20

Which fork is specific for unlogged tables?

free space map

visiblilty map

Initialization fork

Main fork

8 / 20

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

Sysaux Catalog

Sysasm Catalog

System Catalog

Sys Catalog

9 / 20

What is the purpose of wal writer?

executes checkpoints

flushes dirty pages to disk.

collects usage statistics for the instance.

writes WAL entries to disk

10 / 20

What is the purpose of the visibility map?

provides an audit trail for the database

shows a page to be vacuumed or frozen

provides the data decryption key

shows referential relationships for tables

11 / 20

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

pg_tblspc

pg_symlinks

pg_tablespace

pg_tabspace

12 / 20

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

False

True

13 / 20

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

True

False

14 / 20

Which fork contains the actual table data?

visiblilty map

table map

free space map

Main fork

15 / 20

What command is used to create the Postgres cluster?

CreateCluster

StartNewPG

Initialize

CreatePGC

16 / 20

What is the purpose of the template0 database?

No such database

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

Useful for creating development schemas

Useful for Postgres support Services to debug issues

17 / 20

How does Postgres know which schema to use if not specified?

Directory Path

Schema Path

Access Path

Search Path

18 / 20

The information_schema schema provides information on Postgres release notes?

True

False

19 / 20

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

pg_tables

pg_system

pg_catalog

pg_class

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

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

choose 3

Serializable

Repeatable Read

Read Committed

Read Uncommitted

2 / 10

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

True

False

3 / 10

What is the default Isolation Level?

Repeatable Read

Serializable

Read Committed

Read Uncommitted

4 / 10

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

False

True

5 / 10

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

ACID

SOC2

HIPPA

SAFE

6 / 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 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.

A transaction reads one and the same row twice, another transaction modifies this row between these reads issue a rollback.

7 / 10

Which parameters sets the database default isolation level?

default_isolation_level

default_transaction_isolation

transaction_isolation_level

active_transaction_isolation

8 / 10

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

True

False

9 / 10

A phantom read anomaly occurs when?

The same transactions issues a commit, then a rollback to restore data to its original value

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.

10 / 10

The SQL standard specifies three isolation levels?

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

Tuples can also be referred to as columns?

True

False

2 / 10

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

True

False

3 / 10

UPDATE can be regarded as which 2 separate operations?

DELETE

INSERT

MERGE

COMMIT

4 / 10

The page header is located in the highest address?

False

True

5 / 10

CLOG Pages are never cached in memory?

True

False

6 / 10

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

True

False

7 / 10

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

pg_current_xact_id()

pg_current_xmin_id()

pg_current_id()

pg_current_commit_id()

8 / 10

Each page has a layer that usually consists of?

choose 2

undo segment

flashback block

free space

page header

9 / 10

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

pageinspect

pagedetect

pageheadinfo

pagesize

10 / 10

CLOG files are stored in which directory?

PGDATA/pg_commit

PGDATA/pg_xact

PGDATA/clog

PGDATA/pg_clog

Your score is

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