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 by default has built in connection pooling abilities?

False

True

2 / 20

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

pg_tablespace

pg_symlinks

pg_tblspc

pg_tabspace

3 / 20

3. System Catalog tables begin with which prefix?

cat_

pg_

sys_

dba_

4 / 20

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

True

False

5 / 20

5. Users should not modify the template0 database

False

True

6 / 20

6. Files are logically split into pages?

False

True

7 / 20

7. Each Database has its own System Catalog?

False

True

8 / 20

8. Tablespaces are used to define physical data layout?

False

True

9 / 20

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

Initialize

CreatePGC

CreateCluster

StartNewPG

10 / 20

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

False

True

11 / 20

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

False

True

12 / 20

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

5MB

5GB

1MB

1GB

13 / 20

13. What is the purpose of the template0 database?

No such database

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

Useful for Postgres support Services to debug issues

Useful for creating development schemas

14 / 20

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

True

False

15 / 20

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

pginit

postgres

postman

init

16 / 20

16. What is the purpose of the public schema?

restricted schema for postgres internal usage only

no such schema

default schema for user objects

schema used for heterogeneous replication

17 / 20

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

True

False

18 / 20

18. What is the purpose of wal writer?

writes WAL entries to disk

flushes dirty pages to disk.

executes checkpoints

collects usage statistics for the instance.

19 / 20

19. What is the purpose of autovacuum?

Performs a backup of WAL logs

Deletes old logs and traces on disk

Removes stale data from tables and indexes

Rebuilds indexes with b level greater than 2

20 / 20

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

oid

obj

oid#

obj#

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?

True

False

2 / 10

2. 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.

3 / 10

3. What is the default Isolation Level?

Serializable

Read Uncommitted

Read Committed

Repeatable Read

4 / 10

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

False

True

5 / 10

5. Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

default_isolation_level

active_transaction_isolation

6 / 10

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

SAFE

ACID

HIPPA

SOC2

7 / 10

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

choose 3

Repeatable Read

Serializable

Read Uncommitted

Read Committed

8 / 10

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

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

reading data direct from memory using pg_dirt

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

9 / 10

9. non-repeatable read anomaly occurs when?

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

10 / 10

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

Read Committed

Serializable

Read Uncommitted

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

Each pointer uses 8 bytes

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

Also know as the pages table of contents

2 / 10

2. Which 2 items does a Virtual XID consist of?

checksum

sequential number

backend process ID

xmin

3 / 10

3. at any one time Postgres can have several versions of a row?

True

False

4 / 10

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

pg_current_xact_id()

pg_current_commit_id()

pg_current_id()

pg_current_xmin_id()

5 / 10

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

virtual XID

temporary XID

heap XID

magic XID

6 / 10

6. Tuples can also be referred to as columns?

True

False

7 / 10

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

False

True

8 / 10

8. To identify different versions of one and the same row, PostgreSQL marks each of them with which two value?

xid

xmin

xmax

xmas

9 / 10

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

True

False

10 / 10

10. CLOG Pages are never cached in memory?

False

True

Your score is

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