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PostgreSQL
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=== Other storage features === * [[Referential integrity]] constraints including [[foreign key]] constraints, column [[Constraint satisfaction|constraints]], and row checks * Binary and textual large-object storage * [[Tablespace]]s * Per-column collation * Online backup * Point-in-time recovery, implemented using write-ahead logging * In-place upgrades with pg_upgrade for less downtime<!-- (supports upgrades from 8.3.x<ref>{{Cite web|title=PostgreSQL: Documentation: 9.0: pg_upgrade|url=https://www.postgresql.org/docs/9.0/pgupgrade.html|access-date=2020-06-09|website=www.postgresql.org}}</ref> and later) -->
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