I am trying to understand how SQLITE_DEFAULT_MMAP_SIZE works and I think db
files can use MMAP by using this compilation option, as Sqlite3PagerGet()
mapped to getPageMMap(). 
And I know "/the current VFS implementations use a mmapped file for the
wal-index/"

But is there a way that wal-files can use MMAP? Why not? As I guess it can
improve the IO performance in WAL mode.

Thanks for your insights.




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