Moderate SQL Question 91 of 226

What are the ACID properties of a transaction?

Java Specialist · Speak this in 60–90 seconds · Faridabad & Delhi NCR

Without indexScan every row

With indexJump to keys

CostWrites slower

Atomicity: all statements commit or none do.

Why interviewers care about SQL:

SQL questions separate people

who only read docs from people who shipped.

Keep it short, concrete,

and tied to Backend work.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

Before you speak the answer, walk the interviewer through these steps:

1
Atomicity: all statements commit
or none do.
2
Consistency: constraints and invariants
hold after commit.
3
Isolation: concurrent transactions do
not see each other's dirty state beyond the isolation level.
4
Durability: committed data survives
a crash because it is on durable storage.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

Here's a short line you can speak, broken into clear beats:

Say this line

“Isolation: concurrent transactions do not see each other's dirty state beyond th”

Break into beats

Isolationconcurrenttransactionsdonotsee

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Atomicity: all statements commit or none do. Consistency: constraints and invariants hold after commit.