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. When PostgreSQL is running what can it be referred to as?

Choose 2 option

Instance

Postgres Server

Quorum

Aurora

2 / 20

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

Schema Path

Directory Path

Search Path

Access Path

3 / 20

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

True

False

4 / 20

4. What is the default standard size for a fork file?

5GB

1MB

1GB

5MB

5 / 20

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

oid#

obj#

oid

obj

6 / 20

6. What 3 files/forks as a minimum make up a table on disk?

Main fork

visiblilty map

table map

free space map

7 / 20

7. System Catalog tables begin with which prefix?

cat_

sys_

dba_

pg_

8 / 20

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

True

False

9 / 20

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

Sysasm Catalog

Sys Catalog

Sysaux Catalog

System Catalog

10 / 20

10. Tablespaces are used to define physical data layout?

True

False

11 / 20

11. What is the process first launched at server start?

pginit

postman

postgres

init

12 / 20

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

PGTIPS

PGCORE

PGDATA

PGBASE

13 / 20

13. The default Page size is 2k?

False

True

14 / 20

14. Which fork keeps track of available space within pages?

free space map

wal space map

vacuum space map

used space map

15 / 20

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

False

True

16 / 20

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

17 / 20

17. What is the purpose of the visibility map?

provides an audit trail for the database

shows referential relationships for tables

shows a page to be vacuumed or frozen

provides the data decryption key

18 / 20

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

19 / 20

19. TOAST tables reside in a seperate schema?

False

True

20 / 20

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

True

False

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

False

True

2 / 10

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

True

False

3 / 10

3. 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.

4 / 10

4. non-repeatable read anomaly occurs when?

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 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 once, another transaction modifies this row between these reads and commits the change.

5 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

6 / 10

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

Serializable

Read Uncommitted

Read Committed

Repeatable Read

7 / 10

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

False

True

8 / 10

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

choose 3

Repeatable Read

Read Committed

Read Uncommitted

Serializable

9 / 10

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

True

False

10 / 10

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

SOC2

ACID

HIPPA

SAFE

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. CLOG Pages are never cached in memory?

True

False

2 / 10

2. In Postgres, tables are often referred to as which of the below?

view

dump

heap

clog

3 / 10

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

pg_current_commit_id()

pg_current_xmin_id()

pg_current_id()

pg_current_xact_id()

4 / 10

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

True

False

5 / 10

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

True

False

6 / 10

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

False

True

7 / 10

7. indexes do not use row versioning?

True

False

8 / 10

8. CLOG files are stored in which directory?

PGDATA/pg_clog

PGDATA/pg_xact

PGDATA/pg_commit

PGDATA/clog

9 / 10

9. Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/pg_xid

PGDATA/subtrans

PGDATA/pg_min

10 / 10

10. Page free space can often become fragmented?

False

True

Your score is

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