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Intermediate Topic 27 of 51 Databases

Concurrency Control

Techniques coordinating simultaneous database access.

How it works

Pessimistic control uses locks; optimistic control lets transactions proceed and validates at commit (version numbers). MVCC and timestamp ordering are alternatives.

Where it is used

Many users editing the same rows.

Common pitfall

Lost updates occur when read-modify-write is not protected.

Where it fits in the course

Concurrency Control is topic 27 of 51 in Databases, rated Intermediate. It follows Isolation Levels. The next topic is Locking and Two-Phase Locking.

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 Concurrency Control?
Techniques coordinating simultaneous database access. It belongs to Databases and is an intermediate-level topic.
Where do people use Concurrency Control?
Many users editing the same rows.
What is the most common mistake with Concurrency Control?
Lost updates occur when read-modify-write is not protected.
What should I learn before this topic?
Start with Isolation Levels, 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 Concurrency Control 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 Concurrency Control?
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 Concurrency Control?
Isolation Levels, Locking and Two-Phase Locking, ACID Properties are closely connected. The full list is in the related topics section of this page.
What should I study after Concurrency Control?
Continue with Locking and Two-Phase Locking, the next topic in Databases.

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