ACID بالأمثلة

في هذا الدرس

explain A, C, I, and D with a failure story each.

الموضوعات المخطط لها

• Atomicity: all steps or none. Money leaves account A but a crash stops before B is credited: rollback undoes the debit.
• Consistency: rules stay true (stock never below zero, foreign keys valid).
• Isolation: concurrent transactions do not see each other's half-done work (levels come in later modules).
• Durability: once committed, data survives a crash.
• A transaction is one unit of work that begins, then commits or rolls back.