Documents of products collection are intentionally designed to be more complex and larger than accounts - I want to see what happens, what is the performance penalty mainly, once individual documents are stored on multiple database pages. In Postgres, page size is 8 KB by default - in practice, the goal is to have at least 4 rows stored on a single page, so every record that is larger than 2 KB is put on two or more disk pages. It obviously reduces performance for both writes & reads - more disk pages to read from and write to. In Mongo it works slightly differently in details, but essentially in the same vein - larger documents are stored on more than one page, degrading performance for all operations. In both cases we are about to see - how much exactly.
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董哲发现，吴越国的历史人、事，大多散落在这几部信史之中，而专门记载五代十国吴越钱氏的《吴越备史》，只有三分之一的部分留存下来，其中关于钱弘俶的文献经过后人补遗，也很有限。另一本史书《十国春秋》成书于晚清，“作为史料的权威性大打折扣”。