As I step into a Manly side street, I nearly get mown down myself by two teens on fatbikes, each with a pillion passenger, speeding the wrong way down a one-way street.
A composite B-tree is still a sorted tree, but now entries are ordered first by severity, and then by timestamp within each severity value. This works great for this query shape: Postgres can jump directly to the portion of the tree matching severity
。关于这个话题，新收录的资料提供了深入分析
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