只有已选文件夹参与预取操作和模式缓存。
Only the selected folders participate in the pre-fetch operation and schema caching.
Hg对于HTTP这样的无状态的对远程仓库的推送和拉取操作的支持非常好。
Mercurial has very good support for HTTP based stateless pushing and pulling of remote repositories.
当数据库管理器确定顺序 I/O 是适当的，并且确定预取操作可能有助于提高性能时，会使用预取操作（通常是大型表扫描）。
Prefetching is used when the Database Manager determines that sequential I/O is appropriate and that prefetching can help to improve performance (typically large table scans).
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