The Internals of PostgreSQL

· · 来源:tutorial资讯

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首先,CREATE TABLE test (id INTEGER PRIMARY KEY, name TEXT, value REAL);the column id becomes an alias for the internal rowid — the B-tree key itself. A query like WHERE id = 5 resolves to a direct B-tree search and scales O(log n). (I already wrote a TLDR piece about how B-trees work here.) The SQLite query planner documentation states: “the time required to look up the desired row is proportional to logN rather than being proportional to N as in a full table scan.” This is not an optimization. It is a fundamental design decision in SQLite’s query optimizer:

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第三,3. Although far fewer than people expected

此外,Layout engine with flexbox-like sizing, padding, gaps, alignment, scrolling, and floating elements

最后,&YamlLoader::load_from_str(&arg.get_string())

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