Apache Cassandra公式のofficial product documentation page ('Cassandra Basics')（https://cassandra.apache.org/_/cassandra-basics.html）は、Apache Cassandraの差別化要因に関する一次情報である。The existing References describe Cassandra's masterless architecture and high-availability/high-write-throughput use cases at a structural level, but never explain the tunable consistency mechanism that underlies how Cassandra actually balances the CAP-theorem tradeoffs those use cases depend on, so this is a genuinely new and technically substantive angle.具体的には「Apache Cassandra allows the consistency level (the minimum number of nodes that must acknowledge a read or write before it is considered successful) to be configured on a per-query basis, letting operators tune the tradeoff between consistency, availability, and performance for each individual read/write operation rather than being locked into a single fixed consistency model.」といった記載がある。ただし、この差別化要因の記述は当該Sourceの時点の位置づけであり、競合状況の変化を反映しない可能性があります。 This documents the existence and general mechanism of tunable/per-query consistency as officially described; it does not enumerate every specific consistency-level name (e.g. ONE, QUORUM, ALL, LOCAL_QUORUM) verbatim from this particular page, nor does it address how this interacts with the newer vector-search features added in Cassandra 5.0.2026年08月23日に同Sourceを取得し、この内容を確認した。検証待ちApache Cassandra差別化要因に関する公開情報