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，详情可参考新收录的资料
cd libxml2-ee-xxx
Why so many? Because every stage of information processing required a human hand. In a mid-century organisation, a manager did not “write” a memo. He dictated it. A secretary took it down in shorthand, then retyped it. Then made copies. Then collated the copies by hand. Then distributed them. Then filed them. And so on and so on. Nothing moved unless someone physically moved it. There was no other way.，推荐阅读新收录的资料获取更多信息
AST clone on every cache hit. The SQL parse is cached, but the AST is .clone()‘d on every sqlite3_exec(), then recompiled to VDBE bytecode from scratch. SQLite’s sqlite3_prepare_v2() just returns a reusable handle.。关于这个话题，PDF资料提供了深入分析
Елизавета Городищева (Редактор отдела «Экономика»)