🧵 Thread: 🚦 Ever faced a deadlock while coding? Two-phase locking (2PL) is here to save the day! It’s crucial for ensuring consistency in data-intensive applications. Let's dive in! #SystemDesign #DDIA
🔒 Two-phase locking is like a restaurant: first, you reserve a table (lock resources), then you order (execute transactions). No one else can sit at your table until you're done! This prevents conflicts. #TechInterview
🛑 Key terms: *Locking*: controlling access to resources. *Two-phase*: the locking phase (growing) and the unlocking phase (shrinking). Once you unlock, you can't lock again. Simple, right? #SystemDesign #DDIA
🔍 How does 2PL work? Start by acquiring locks (growing phase). Once all needed locks are acquired, execute your transaction. After that, release the locks (shrinking phase). 💡 Here's a simple flow: Acquire -> Execute -> Release. #TechInterview
⚙️ In practice, 2PL can be implemented using shared and exclusive locks. Shared locks allow read access, exclusive locks allow write access. This balance helps maintain data integrity. #SystemDesign #DDIA
⚖️ Trade-offs: 2PL ensures consistency but can lead to deadlocks if not managed. It can reduce concurrency since transactions wait for locks. Use it for critical transactions but watch out for performance hits! #TechInterview
🛑 When to use 2PL? Ideal for systems needing strict consistency (like banking). Avoid it in high-concurrency scenarios (e.g., online shopping carts) where performance matters. Think Netflix vs. a financial app! #SystemDesign #DDIA
💡 Key takeaway: Two-phase locking balances consistency and performance. Master it to ace your interviews! Remember, it's all about knowing when to apply the right technique. Good luck! #TechInterview #SystemDesign
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