Shulou(Shulou.com)06/01 Report--

1. Introduction

It's like a catalog of a book, and without it, we need to search the whole book to get the results we need, that is, the so-called full scan.

After having the catalog (index), we can use it to help us locate the location of the target and quickly get the results we want.

2. Demo

The first step is to insert 100W pieces of data into the user collection users

1 var insertUsers = function () {2 var start = new Date () .getTime (); 3 for (var I = 1; I

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