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. Tablespaces are used to define physical data layout?

True

False

2 / 20

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

True

False

3 / 20

3. A schema can belong to more than one database?

False

True

4 / 20

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

True

False

5 / 20

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

obj#

oid#

obj

oid

6 / 20

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

pg_tblspc

pg_symlinks

pg_tablespace

pg_tabspace

7 / 20

7. What is the purpose of the public schema?

default schema for user objects

schema used for heterogeneous replication

no such schema

restricted schema for postgres internal usage only

8 / 20

8. What is the purpose of the postgres database?

a template for all the other database

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

No such database

regular database that you can use at your discretion

9 / 20

9. Postgres server spawns a new backend session for each connection?

True

False

10 / 20

10. What command is used to create the Postgres cluster?

CreateCluster

CreatePGC

StartNewPG

Initialize

11 / 20

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

False

True

12 / 20

12. Each tablespaces can only be assigned for use by one database

False

True

13 / 20

13. Which 3 databases exist directly after cluster initialization?

choose 3 options

sysaux

template0

postgres

template1

14 / 20

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

False

True

15 / 20

15. How many rows in a page does Postgres aim to have before considering TOAST?

16 / 20

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

Sysasm Catalog

Sys Catalog

Sysaux Catalog

System Catalog

17 / 20

17. Files are logically split into pages?

False

True

18 / 20

18. What is the name of the 2 default tablespaces created after initialization?

choose 2

pg_default

pg_tablespace

pg_global

pg_temp

19 / 20

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

True

False

20 / 20

20. What is a schema?

Namespace that store all objects of a database

A memory area used to cache data from LRU chains

The name used to refer to a super user account

This is the same as a user in Postgres

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

Read Committed

Serializable

Read Uncommitted

Repeatable Read

2 / 10

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

reading data direct from memory using pg_dirt

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

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

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

3 / 10

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

False

True

4 / 10

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

False

True

5 / 10

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

False

True

6 / 10

6. 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.

7 / 10

7. Which parameters sets the database default isolation level?

transaction_isolation_level

default_isolation_level

default_transaction_isolation

active_transaction_isolation

8 / 10

8. 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 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

9 / 10

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

ACID

HIPPA

SAFE

SOC2

10 / 10

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

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Use a single SQL operator

Apply explicit locks

Replace procedural code with declarative one.

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. virtual IDs exist only in PGDATA/pg_vxid when not cached?

False

True

3 / 10

3. What does an Item Pointer contain?

choose 3

tuple length

tuple xid

tuple offset from the start of the page

tuple status

4 / 10

4. Page free space can often become fragmented?

True

False

5 / 10

5. CLOG contains how many bits for each transaction?

6 / 10

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

pagesize

pageinspect

pageheadinfo

pagedetect

7 / 10

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

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

Each pointer uses 8 bytes

Also know as the pages table of contents

8 / 10

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

True

False

9 / 10

9. indexes do not use row versioning?

True

False

10 / 10

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

True

False

Your score is

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