sqlite C\C++ 库是否将 DB 文件保留为内存映射文件？ 是否有可能做到这一点？
[英]Does sqlite C\C++ library keep DB file as Memory-mapped file? and is it possible to make it do so?
问题描述
So I wonder how sqlite C/C++ API keeps opened DB: does it use Memory-mapped file?
所以我想知道 sqlite C/C++ API 如何保持打开的 DB：它是否使用内存映射文件？ Or how to make it do so?或者如何让它这样做？
2 个解决方案
解决方案1
2 已采纳 2011-08-12 22:50:30
Yes, it does.是的，它确实。 Just search sqlite3.c for CreateFileMapping .只需搜索 sqlite3.c 的CreateFileMapping 。
解决方案2
0 2017-12-07 19:35:29
By default, SQLite uses memory mapping for shared memory file which only gets used in WAL journal mode.默认情况下，SQLite 使用 memory 映射共享 memory 文件，该文件仅用于 WAL 日志模式。 As per SQLite documentation https://sqlite.org/mmap.html , we can set PRAGMA mmap_size to force SQLite to use memory mapped file i/o in other modes as well. As per SQLite documentation https://sqlite.org/mmap.html , we can set PRAGMA mmap_size to force SQLite to use memory mapped file i/o in other modes as well. However, SQLite falls back to regular file i/o if it fails to map files in the memory.但是，如果 SQLite 无法访问 memory 中的 map 文件，则会回退到常规文件 i/o。
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