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

1. Postgres uses a thread based process model?

False

True

2 / 20

2. Postgres by default has built in connection pooling abilities?

False

True

3 / 20

3. Which 3 databases exist directly after cluster initialization?

choose 3 options

template1

template0

postgres

sysaux

4 / 20

4. A single Postgres Instance can server only one database?

True

False

5 / 20

5. The information_schema schema provides information on Postgres release notes?

False

True

6 / 20

6. What is the purpose of wal writer?

writes WAL entries to disk

flushes dirty pages to disk.

collects usage statistics for the instance.

executes checkpoints

7 / 20

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

False

True

8 / 20

8. Files are logically split into pages?

False

True

9 / 20

9. TOAST tables reside in a seperate schema?

True

False

10 / 20

10. It is the postmasters job to listener for incoming connections?

True

False

11 / 20

11. What column in system catalogs servers as the Primary Key

oid

obj#

oid#

obj

12 / 20

12. Tablespaces are used to define physical data layout?

True

False

13 / 20

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

True

False

14 / 20

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

PGBASE

PGCORE

PGTIPS

PGDATA

15 / 20

15. What is the purpose of the template0 database?

No such database

Useful for Postgres support Services to debug issues

Useful for creating development schemas

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

16 / 20

16. pg_catalog schema is used to store system catalog tables?

True

False

17 / 20

17. System Catalog tables begin with which prefix?

dba_

cat_

pg_

sys_

18 / 20

18. Each Database has its own System Catalog?

False

True

19 / 20

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

20 / 20

20. What is a schema?

A memory area used to cache data from LRU chains

This is the same as a user in Postgres

Namespace that store all objects of a database

The name used to refer to a super user account

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

1. 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 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 issue a rollback.

2 / 10

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

choose 3

Read Uncommitted

Read Committed

Repeatable Read

Serializable

3 / 10

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

False

True

4 / 10

4. Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

default_isolation_level

active_transaction_isolation

5 / 10

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

SOC2

ACID

HIPPA

SAFE

6 / 10

6. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Rollback Read

Serializable

Random Scatter

7 / 10

7. Which of the below would best describe a dirty read?

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

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

8 / 10

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

True

False

9 / 10

9. What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

Replace procedural code with declarative one.

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

10 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=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

1. Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/pg_min

PGDATA/subtrans

PGDATA/pg_xid

2 / 10

2. If a transaction aborts, all page changes are reverted(rolled back) in place?

False

True

3 / 10

3. Tuples can also be referred to as columns?

False

True

4 / 10

4. The page header is located in the highest address?

True

False

5 / 10

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

True

False

6 / 10

6. Page free space can often become fragmented?

False

True

7 / 10

7. Which of the below are true about a Pages Item Pointer?

Each pointer uses 4 bytes

stored in PGDATA/itemptr directory

Also know as the pages table of contents

Each pointer uses 8 bytes

8 / 10

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

pagesize

pageheadinfo

pageinspect

pagedetect

9 / 10

9. Each page has a layer that usually consists of?

choose 2

flashback block

free space

page header

undo segment

10 / 10

10. CLOG Pages are never cached in memory?

True

False

Your score is

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