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Intermediate Topic 24 of 51 Databases

Transactions

Groups of operations executed as an atomic unit.

How it works

A transaction groups statements so they commit together or roll back entirely: BEGIN, statements, COMMIT or ROLLBACK. Savepoints allow partial rollback.

Where it is used

Money transfers: debit and credit must both happen.

Common pitfall

Long transactions hold locks and block others.

Where it fits in the course

Transactions is topic 24 of 51 in Databases, rated Intermediate. It follows Denormalization. The next topic is ACID Properties.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Databases quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Transactions?
Groups of operations executed as an atomic unit. It belongs to Databases and is an intermediate-level topic.
Where do people use Transactions?
Money transfers: debit and credit must both happen.
What is the most common mistake with Transactions?
Long transactions hold locks and block others.
What should I learn before this topic?
Start with Denormalization, the topic just before it in Databases.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Databases quiz.
Is Transactions hard to learn?
It is an Intermediate topic. Be comfortable with the Beginner topics in this area first, then read the common pitfall carefully, since it is where most mistakes happen.
How long does it take to learn Transactions?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Transactions?
Denormalization, ACID Properties, Normal Forms are closely connected. The full list is in the related topics section of this page.
What should I study after Transactions?
Continue with ACID Properties, the next topic in Databases.

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