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

True

False

2 / 20

2. Postgres uses a thread based process model?

False

True

3 / 20

3. Each Database has its own System Catalog?

False

True

4 / 20

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

True

False

5 / 20

5. What is the purpose of the postgres database?

a template for all the other database

No such database

regular database that you can use at your discretion

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

6 / 20

6. Tablespaces are used to define physical data layout?

True

False

7 / 20

7. What is the purpose of the public schema?

default schema for user objects

schema used for heterogeneous replication

restricted schema for postgres internal usage only

no such schema

8 / 20

8. The default Page size is 2k?

False

True

9 / 20

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

False

True

10 / 20

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

1GB

5MB

1MB

5GB

11 / 20

11. What is a schema?

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

A memory area used to cache data from LRU chains

12 / 20

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

False

True

13 / 20

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

CreateCluster

Initialize

StartNewPG

CreatePGC

14 / 20

14. System Catalog tables begin with which prefix?

dba_

cat_

sys_

pg_

15 / 20

15. What is another name for the postgres process?

postmaster

aurora

masterprocess

postmanager

16 / 20

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

obj

oid#

obj#

oid

17 / 20

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

18 / 20

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

Choose 2 option

Instance

Postgres Server

Aurora

Quorum

19 / 20

19. Which of below are predefined schemas?

choose 3

pg_temp

pg_schema

pg_toast

information_schema

20 / 20

20. What is the purpose of wal writer?

flushes dirty pages to disk.

collects usage statistics for the instance.

writes WAL entries to disk

executes checkpoints

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

False

True

2 / 10

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

Select more than 1 answer below:

Apply explicit locks

Replace procedural code with declarative one.

Use a single SQL operator

Issues a rollback after the commit to satisfy repeatable read.

3 / 10

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

True

False

4 / 10

4. A phantom read anomaly occurs when?

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

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.

5 / 10

5. The SQL standard specifies three isolation levels?

True

False

6 / 10

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

True

False

7 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

8 / 10

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

False

True

9 / 10

9. 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

10 / 10

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

HIPPA

SAFE

SOC2

ACID

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. What does an Item Pointer contain?

choose 3

tuple status

tuple offset from the start of the page

tuple length

tuple xid

2 / 10

2. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/pg_min

PGDATA/pg_subtrans

PGDATA/subtrans

3 / 10

3. UPDATE can be regarded as which 2 separate operations?

INSERT

MERGE

DELETE

COMMIT

4 / 10

4. 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()

5 / 10

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

commit log

redo log

archive log

transaction log

6 / 10

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

pagesize

pageheadinfo

pageinspect

pagedetect

7 / 10

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

False

True

8 / 10

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

True

False

9 / 10

9. CLOG contains how many bits for each transaction?

10 / 10

10. Page free space can often become fragmented?

False

True

Your score is

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