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PostgreSQL Tutorial
BOSS QUIZ
10 questions · 5 minutes · pass at 70% to clear the track.
05:00
Start
Q1.
A Seq Scan on a big table usually means…
from EXPLAIN ANALYZE
You have a good index
Missing or unusable index
The DB is corrupt
Plan is cached
Q2.
Roll back a transaction with…
from Transactions / Isolation
REVERT
ROLLBACK
CANCEL
UNDO
Q3.
For querying / indexing JSON, prefer…
from JSON / JSONB
json
jsonb
text
varchar
Q4.
The interactive client is…
from Intro
pg
psql
pgshell
sqlplus
Q5.
A CTE is visible…
from CTEs (WITH)
Globally forever
Only within the enclosing statement
In the next query
Across the session
Q6.
Default isolation level is…
from Transactions / Isolation
Read Uncommitted
Read Committed
Repeatable Read
Serializable
Q7.
GIN indexes are most useful for…
from JSON / JSONB
Sequential scans
jsonb / arrays / full-text
B-tree only
BRIN
Q8.
A CTE is introduced by the keyword…
from CTEs (WITH)
WITH
LET
CTE
TEMP
Q9.
See actual run times with…
from EXPLAIN ANALYZE
EXPLAIN
EXPLAIN ANALYZE
PROFILE
TRACE
Q10.
PG enforces serializable safety via…
from Transactions / Isolation
Pessimistic locks only
SSI (Serializable Snapshot Isolation)
2-phase commit
GTID
Submit
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