basic index

基本解释

Example 36. To collect basic index catalog statistics
收集基本的索引目录统计信息
To create a basic index, you use the ensureIndex function.
要创建一个基本索引，使用 ensureIndex 函数。
The example will also familiarize you with basic index operations.
该示例还让您熟悉基本的索引操作。

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