Christophe Pettus: All Your GUCs in a Row: parallel_leader_participation

Whether your query's leader process joins the work or just supervises depends on this boolean, and the performance question it settles is subtle. (I consult on PostgreSQL through PGX Inc..)

DatabasesPlanet PostgreSQLPublished: October 10, 2026

Databases

Read original article ↗← News

Databases

DatabasesPlanet PostgreSQLOct 10, 2026Content in its original language: Portuguese

Christophe Pettus: All Your GUCs in a Row: parallel_setup_cost and parallel_tuple_cost

PostgreSQL's parallel query planner charges two fees for going parallel: a setup cost per Gather node and a per-row cost for moving data from workers to… (I consult on PostgreSQL through PGX Inc..)

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Databases

DatabasesPlanet PostgreSQLOct 9, 2026

Chris van Eijk: new row violates row-level security policy: the causes

What raised 'new row violates row-level security policy for table' in PostgreSQL 17, measured: inserts, RETURNING, upserts, MERGE and four message forms.

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DatabasesPercona Database BlogOct 9, 2026

MongoDB 9.0: More 8.4 than 9.0?

MongoDB 9.0 is here. Strip away the marketing around AI, Atlas, and “the best version ever built”, and MongoDB 9.0 starts to look a lot like MongoDB 8.4. Sure, there are some useful changes, but I don’t see a single feature that…

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Christophe Pettus: All Your GUCs in a Row: parallel_leader_participation

Whether your query's leader process joins the work or just supervises depends on this boolean, and the performance question it settles is subtle. (I consult on PostgreSQL through PGX Inc..)

DatabasesPlanet PostgreSQLPublished: October 10, 2026

Databases

Read original article ↗← News

Databases

DatabasesPlanet PostgreSQLOct 10, 2026Content in its original language: Portuguese

Christophe Pettus: All Your GUCs in a Row: parallel_setup_cost and parallel_tuple_cost

PostgreSQL's parallel query planner charges two fees for going parallel: a setup cost per Gather node and a per-row cost for moving data from workers to… (I consult on PostgreSQL through PGX Inc..)

View summary Read original article ↗

Databases

DatabasesPlanet PostgreSQLOct 9, 2026

Chris van Eijk: new row violates row-level security policy: the causes

What raised 'new row violates row-level security policy for table' in PostgreSQL 17, measured: inserts, RETURNING, upserts, MERGE and four message forms.

View summary Read original article ↗

Databases

DatabasesPercona Database BlogOct 9, 2026

MongoDB 9.0: More 8.4 than 9.0?

View summary Read original article ↗

Christophe Pettus: All Your GUCs in a Row: parallel_leader_participation

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Christophe Pettus: All Your GUCs in a Row: parallel_setup_cost and parallel_tuple_cost

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Christophe Pettus: All Your GUCs in a Row: parallel_leader_participation

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Christophe Pettus: All Your GUCs in a Row: parallel_setup_cost and parallel_tuple_cost

Chris van Eijk: new row violates row-level security policy: the causes

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