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In my testing I am finding that using SQLite's mmap support with
larger databases (final db size is ~10GB) to create the database (WAL
mode) is considerably (about three times) slower than no mmap.

The default max mmap limit is 2GB (sadly).  Has anyone else tested
mmap with >2GB databases and have results?  I don't know if this is a
peculiarity of my data set, or because of how SQLite is implemented.

Roger
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