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Partial indexes let you index only the rows you actually query, cutting index size and write overhead on skewed data. Learn when to use them, how to verify planner usage, and the key limitations to watch.
PostgreSQL partial indexes index only rows matching a WHERE predicate, shrinking index size and cutting write overhead for skewed data. Covers syntax, planner rules, unique soft-delete constraints, monitoring, and pitfalls.
When most of your rows are filtered out by a common predicate, a partial index can cut index size and write overhead. Learn how to create, test, and trade-off partial indexes in PostgreSQL.
Learn how to use PostgreSQL partial indexes to reduce storage and write overhead by indexing only a specific subset of rows using a WHERE predicate.
The goal is to determine whether PostgreSQL 12 allows a partial index on a jsonb column that is defined using the ->> operator without an explicit cast. In PostgreSQL 11 a cast to text is required, while 12 accepts the operator directly, but the planner may still choose a sequential scan if the predicate includes a cast, resulting in suboptimal perform
When using Ecto.Repo.upsert_all/3 with :on_conflict set to a partial unique index and :returning true, it is unclear whether the returned structs contain post‑computation values for generated columns and columns altered by AFTER INSERT/UPDATE triggers. PostgreSQL may reflect the trigger‑modified state, but MySQL and SQLite ignore :returning entirely, returni
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