ACID
Specify atomicity, consistency, isolation, and durability for transactions.
Use this when A transfer or order must preserve invariants across several database changes.
without the term
“This transfer must either finish completely or leave no partial changes. Explain concurrency and crash guarantees too.”
with the term · How do you ask a model for ACID?
State the ACID guarantees for this transaction. Test rollback, concurrent invariants, and the configured commit durability.
What is ACID?
ACID describes transaction properties: all-or-nothing effects, preservation of defined invariants, controlled interaction with concurrent transactions, and persistence of acknowledged commits under the stated durability configuration.
Why does ACID matter when vibe coding?
An agent can wrap code in a transaction while leaving a weak isolation level or an external side effect outside its guarantees.
How do you do ACID?
Define constraints, isolation, and commit durability. Check rollback and competing transactions. Keep external side effects outside the claimed local atomic boundary.
What goes wrong with ACID?
ACID consistency is invariant preservation, not CAP consistency. A local transaction cannot roll back an already sent email.
Sources for this entry
- PostgreSQL: Transactions
Atomic transaction boundaries, visibility of intermediate changes, commit, rollback, and persistence.
- PostgreSQL: Transaction isolation
Isolation-level behavior in PostgreSQL; snapshot isolation can still allow serialization anomalies.
- PostgreSQL: Write-ahead logging
Log records reach durable storage before the corresponding data changes; redo supports crash recovery.
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