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. 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

regular database that you can use at your discretion

No such database

2 / 20

2. What is the point of the pg_global tablespace?

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

3 / 20

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

False

True

4 / 20

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

5 / 20

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

Sysasm Catalog

Sysaux Catalog

Sys Catalog

System Catalog

6 / 20

6. Postgres uses a thread based process model?

False

True

7 / 20

7. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

postgres

sysaux

template1

8 / 20

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

choose 3

indexes

sequences

triggers

tables

9 / 20

9. Some System Catalog tables are common to all databases in the cluster?

True

False

10 / 20

10. The default Page size is 2k?

True

False

11 / 20

11. 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

12 / 20

12. TOAST tables reside in a seperate schema?

False

True

13 / 20

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

choose 2

pg_default

pg_temp

pg_tablespace

pg_global

14 / 20

14. What is the name of the mechanism used to store a row bigger than a page size?

BAKE

BREAD

GROW

TOAST

15 / 20

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

pg_tablespace

pg_symlinks

pg_tabspace

pg_tblspc

16 / 20

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

Search Path

Access Path

Schema Path

Directory Path

17 / 20

17. What is another name for the postgres process?

postmanager

masterprocess

aurora

postmaster

18 / 20

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

PGBASE

PGTIPS

PGCORE

PGDATA

19 / 20

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

True

False

20 / 20

20. Which of below are predefined schemas?

choose 3

pg_schema

information_schema

pg_temp

pg_toast

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. 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.

Issues a rollback after the commit to satisfy repeatable read.

Use a single SQL operator

Apply explicit locks

2 / 10

2. 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 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.

3 / 10

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

SOC2

ACID

SAFE

HIPPA

4 / 10

4. The SQL standard specifies three isolation levels?

True

False

5 / 10

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

False

True

6 / 10

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

True

False

7 / 10

7. A phantom read anomaly occurs when?

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

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 transaction executes two identical queries returning a set of rows that satisfy a particular condition, while another transaction also queries this same data.

8 / 10

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

False

True

9 / 10

9. Which parameters sets the database default isolation level?

active_transaction_isolation

default_transaction_isolation

transaction_isolation_level

default_isolation_level

10 / 10

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

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

1. CLOG Pages are never cached in memory?

True

False

2 / 10

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

pageheadinfo

pageinspect

pagesize

pagedetect

3 / 10

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

True

False

4 / 10

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

True

False

5 / 10

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

Each pointer uses 8 bytes

Each pointer uses 4 bytes

stored in PGDATA/itemptr directory

Also know as the pages table of contents

6 / 10

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

True

False

7 / 10

7. status of a subtransaction is written into CLOG?

True

False

8 / 10

8. What does an Item Pointer contain?

choose 3

tuple xid

tuple offset from the start of the page

tuple status

tuple length

9 / 10

9. If a transaction is read only which kind of Transaction ID is it allocated?

temporary XID

virtual XID

magic XID

heap XID

10 / 10

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

archive log

transaction log

commit log

redo log

Your score is

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