dirty read
Read a value another transaction has written but not committed.
Use this when A report might include an update that is later rolled back.
without the term
“Can this query see another transaction’s unfinished update even if that transaction later rolls back?”
with the term · How do you ask a model for dirty read?
Test whether this isolation level allows a dirty read using an uncommitted update followed by rollback.
What is dirty read?
A dirty read exposes uncommitted data from another transaction. Whether it is possible depends on the engine and isolation configuration; PostgreSQL treats Read Uncommitted as Read Committed and prevents it.
Why does dirty read matter when vibe coding?
An agent can lower isolation for speed without checking whether transient values become user-visible.
How do you do dirty read?
Use two sessions: pause an uncommitted update, read from the other session, then roll back. Verify the behavior under the actual engine and isolation level.
What goes wrong with dirty read?
Dirty reads differ from stale committed reads on a replica and from read skew across separate committed moments.
Sources for this entry
- PostgreSQL: Transaction isolation
Isolation-level behavior in PostgreSQL; snapshot isolation can still allow serialization anomalies.
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