@pmatilai, briefly **MDBX support 2 times longer keys than LMDB**.
In details:
- the key size limit depends from the database page size.
- for default (4K) pages MDBX now accepts keys up 1980 bytes (ie slightly less
than half the page size).
- but this value will soon be revised down to be slightly less than 1/3 of the
page size.
- MDBX allows you to set the page size when creating a database, ranging from
512 to 65536 bytes.
So, MDBX allow significant large key sizes, including MAX_PATH (ie 4096) with
corresponding size of database page.
P.S. Seems this should be added to the "list of Improvements over LMDB".
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