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  5. Alexander Ioffe: I ran the same query twice and Postgres disagreed with itself
Alexander Ioffe: I ran the same query twice and Postgres disagreed with itself
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Alexander Ioffe: I ran the same query twice and Postgres disagreed with itself

Two EXPLAIN ANALYZE runs on statistically identical data produced opposite plans, 73 heap blocks against 3,449. The margin was 1.5%. Here's the mechanism, measured with ExoBench, and the index shape that takes the coin out of the planner's…

DatabasesPlanet PostgreSQLPublished: October 6, 2026
Databases
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Christophe Pettus: All Your GUCs in a Row: notify_buffers

The `notify_buffers` GUC tunes a 128kB cache for PostgreSQL's LISTEN/NOTIFY queue—and almost never matters. (I consult on PostgreSQL through PGX Inc..)

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Databases
DatabasesPlanet PostgreSQLOct 5, 2026

Christophe Pettus: Everyone into the Pool

PostgreSQL connection poolers lie to both sides of the wire: your app thinks it has thousands of connections while the database sees dozens. (I consult on PostgreSQL through PGX Inc..)

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Databases
DatabasesPlanet PostgreSQLOct 5, 2026

Christophe Pettus: The Vector That Lied About Its Dimensions

pgvector 0.8.7 fixes CVE-2026-103484: a database user who can create an IVFFlat index can write out of bounds in the backend, which can lead to arbitrary code execution. Every version through 0.8.6 is affected. Upgrade. That part is…

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