Hello,

we are using lmbd in our product as database backend to save big key value ( 16K ) .

First at all, lmbd is the best database in performance comparaison ( read / write) that we have tested.

My question :
# Databases
data_dir:/data/cache/data
lmdb version:LMDB 0.9.16: (August 14, 2015)
db page size:4096
b-tree depath:4
branch pages:527
leaf pages:29287
overflow oages:6659875
data items:1331990

We have a lot of leaf pages, this is due to our big value size.

When the database is empty, write and read are very fast,

but when we delete all keys or a big part of keys, write and read (new keys) becomes very poor in performance ( / 100 ) .

Is it a normal due to our big values ?

The only solution we have found is to destroy database file rather than deleting keys

Regards,

Nicolas Prochazka