If there are not sufficient free pages available in RAM or other pages which can be paged out by the OS to fit the database segment, a request to start a database will fail.
如果在RAM中没有足够的空闲页可用，或者没有足够的可以被OS为满足数据库段而调出的其他页，那么启动数据库的请求就会遭到失败。
The PARAMETERS segment contains all the details of the request.
PARAMETERS 部分包含请求的所有细节。
The cut attribute indicates whether to delete the matched substring segment from the request URL before proceeding.
cut 属性指出是否在继续之前从请求 URL 中删除匹配的子字符串片段。
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