The I in ACID
summary
Clear definitions of ACID with focus on isolation anomalies: dirty read, lost update, non‑repeatable read and phantom read, each shown with concrete bank or shopping examples that produce wrong balances or missing cart items. Explains MVCC and that PostgreSQL implements read committed by default (it disallows read‑uncommitted), how serializable prevents anomalies at higher cost, deadlocks are resolved by killing transactions, and practical rules: keep transactions short, change rows in a consistent order, and use serializable only for strict cases like invoice sequencing.
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chapters (6)
- 0:00Introduction
- 2:57ACID properties overview
- 8:38Isolation anomalies explained
- 27:38Isolation levels and trade-offs
- 34:15Deadlocks and prevention
- 37:29Practical use of isolation
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