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?

pg_

sys_

cat_

dba_

2 / 20

Users should not modify the template0 database

True

False

3 / 20

What is another name for the postgres process?

postmanager

aurora

postmaster

masterprocess

4 / 20

Which fork contains the actual table data?

table map

Main fork

free space map

visiblilty map

5 / 20

Which fork keeps track of available space within pages?

wal space map

used space map

vacuum space map

free space map

6 / 20

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

PGDATA

PGCORE

PGTIPS

PGBASE

7 / 20

What is the purpose of wal writer?

executes checkpoints

writes WAL entries to disk

collects usage statistics for the instance.

flushes dirty pages to disk.

8 / 20

How many files or forks on disk will a 10Mb table with no index have?

9 / 20

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

pg_system

pg_catalog

pg_class

pg_tables

10 / 20

Postgres uses a thread based process model?

False

True

11 / 20

Which fork is specific for unlogged tables?

Main fork

visiblilty map

free space map

Initialization fork

12 / 20

Which of below are predefined schemas?

choose 3

pg_schema

pg_temp

pg_toast

information_schema

13 / 20

What column in system catalogs servers as the Primary Key

obj#

oid

oid#

obj

14 / 20

The default Page size is 2k?

False

True

15 / 20

What command is used to create the Postgres cluster?

CreatePGC

StartNewPG

CreateCluster

Initialize

16 / 20

What is the purpose of the template0 database?

Useful for creating development schemas

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

No such database

Useful for Postgres support Services to debug issues

17 / 20

Postgres server spawns a new backend session for each connection?

False

True

18 / 20

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

True

False

19 / 20

The information_schema schema provides information on Postgres release notes?

True

False

20 / 20

Who is the Author of the Postgres 14 Internals book?

Dan Brown

Sam Altman

Paul Sammy

Egor Rogov

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?

True

False

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

A phantom read anomaly occurs when?

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 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 adds some other rows satisfying this condition and commits.

5 / 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 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.

6 / 10

Which parameters sets the database default isolation level?

transaction_isolation_level

default_isolation_level

default_transaction_isolation

active_transaction_isolation

7 / 10

What is the default Isolation Level?

Read Uncommitted

Repeatable Read

Read Committed

Serializable

8 / 10

Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Random Scatter

Read Committed

Serializable

9 / 10

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

choose 3

Repeatable Read

Read Uncommitted

Serializable

Read Committed

10 / 10

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

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

Postgres table physical data files are always cross compatible across platforms?

True

False

2 / 10

Tuples can also be referred to as columns?

False

True

3 / 10

What does an Item Pointer contain?

choose 3

tuple status

tuple offset from the start of the page

tuple xid

tuple length

4 / 10

When a row is created, its xmin value is set to the transaction ID of which command?

DELETE

INSERT

COMMIT

CREATE

5 / 10

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

True

False

6 / 10

indexes do not use row versioning?

False

True

7 / 10

CLOG Pages are never cached in memory?

False

True

8 / 10

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

pg_current_commit_id()

pg_current_xact_id()

pg_current_xmin_id()

pg_current_id()

9 / 10

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

transaction log

commit log

redo log

archive log

10 / 10

The page Special Space is located at the start of the page with highest address

False

True

Your score is

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