Probably the biggest issues with database performance come as a result of poor database design and missing indexes.

数据库性能的最大问题可能源自于不良数据库设计和缺失索引。

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Common issues include ill-written queries, missing indexes, and excessive Numbers of database requests per operation.

常见的问题包括编写得有毛病的查询、遗漏了索引以及每个操作中过量的数据库请求。

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Given these bleak statistics, it's likely that your site has many pages missing from the search indexes, and those pages can never be found.

既然这个比例如此低，您的站点中很可能有许多页面没有被编入索引，因此这些页面不可能被搜索到。

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