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  5. Alexander Ioffe: Explain Analyze is a sample-size of One: Your query ran 1,100x faster the second time. It wasn't the cache.
Alexander Ioffe: Explain Analyze is a sample-size of One: Your query ran 1,100x faster the second time. It wasn't the cache.
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Alexander Ioffe: Explain Analyze is a sample-size of One: Your query ran 1,100x faster the second time. It wasn't the cache.

The same LIMIT query on an idle Postgres: 78 ms, then 0.07 ms, with every page already in shared_buffers. Ten runs with a standard deviation and a per-run sample on each plan node found the cause (synchronize_seqscans), a control proved…

DatabasesPlanet PostgreSQLPublished: October 13, 2026
Databases
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Our new repo star history API now provides trends without returning individual identities or requiring unbounded database work. These are the engineering tradeoffs we made. The post From 2,500 requests to 24: Rebuilding star history…

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DatabasesCloudflare BlogOct 14, 2026Content in its original language: Portuguese

Inside Hyperdrive: How we solved a rare Hyperdrive MySQL caching bug

While adding MySQL support to Hyperdrive, we found a subtle protocol bug when caching query results. Here is how we tracked down a 0.001% rate error and made Hyperdrive MySQL generally available.

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Databases
DatabasesPlanet PostgreSQLOct 14, 2026Content in its original language: Portuguese

Christophe Pettus: All Your GUCs in a Row: post_auth_delay and pre_auth_delay

Debugging PostgreSQL connections requires stopping a backend before it does anything interesting. (I consult on PostgreSQL through PGX Inc..)

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