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When upserts don’t update but still write: Debugging Postgres performance at scale

Datadog Engineering · published 23 March 2026

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2blogs citing
First cited
6 May 2026
Most recent
12 Jun 2026
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13
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Cited by

Blog
In the post
Date
gaultier.github.io
Don't run SQL migrations in tests: How I sped up the test suite by 2x Read at the source ↗
12 Jun 2026
pfbonkers.com
Cool Things - May 6, 2026 Read at the source ↗
6 May 2026

Links from this post

Link
Host
https://www.postgresql.org/docs/current/wal-intro.html
postgresql.org
https://docs.datadoghq.com/agent/?tab=Host-based
docs.datadoghq.com
https://www.postgresql.org/docs/current/mvcc-intro.html
postgresql.org
https://www.postgresql.org/docs/current/storage-hot.html
postgresql.org
https://www.postgresql.org/docs/current/pgwalinspect.html
postgresql.org
https://github.com/postgres/postgres/blob/b7cc6474e930d4429b15657d6910e1e32066de5e/src/backend/executor/nodeModifyTable.c
github.com
https://github.com/postgres/postgres/blob/b7cc6474e930d4429b15657d6910e1e32066de5e/src/backend/access/heap/heapam.c
github.com
https://github.com/postgres/postgres/blob/b7cc6474e930d4429b15657d6910e1e32066de5e/src/backend/access/transam/xact.c
github.com
https://www.postgresql.org/docs/current/sql-insert.html
postgresql.org
https://www.postgresql.org/docs/current/pgtestfsync.html
postgresql.org
https://www.postgresql.org/docs/current/queries-with.html
postgresql.org
https://www.postgresql.org/docs/current/runtime-config-wal.html
postgresql.org
https://careers.datadoghq.com/all-jobs/?parent_department_Engineering%5B0%5D=Engineering&child_department_Engineering%5B0%5D=Backend&utm_source=engblog&utm_medium=corpsite&utm_campaign=engcommunity-2025--postgresql&gh_src=hm4uekgj1us
careers.datadoghq.com