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Can I open multiple tries on single db? Such as Ethereum, it use single leveldb for man account trie and
all storage tries?

Hi,
It seems the library does not removed the nodes, which is already added to the db, during the updating. The old nodes are only removed in the live cache, rather than in the db. So if one node is commit to the db, it will stay there forever. For example, if I run the code:

keys := getFreshData(10000, 32)
for i := 0; i < 30; i++ {
    values := getFreshData(10000, 32)
    smt.Update(keys, values)
    smt.Commit()
}

The size of the db keeps growing, even the keys do not change.

github.com/aergoio/aergo-lib/db

/home/ellis/Documents/Golang/src/github.com/aergoio/aergo-lib/db/badgerdb.go:130:15: assignment mismatch: 2 variables but 1 values
/home/ellis/Documents/Golang/src/github.com/aergoio/aergo-lib/db/badgerdb.go:130:28: not enough arguments in call to item.Value
have ()
want (func([]byte) error)
/home/ellis/Documents/Golang/src/github.com/aergoio/aergo-lib/db/badgerdb.go:249:30: too many arguments in call to transaction.tx.Commit
have (nil)
want ()
/home/ellis/Documents/Golang/src/github.com/aergoio/aergo-lib/db/badgerdb.go:335:14: assignment mismatch: 2 variables but 1 values
/home/ellis/Documents/Golang/src/github.com/aergoio/aergo-lib/db/badgerdb.go:335:39: not enough arguments in call to iter.iter.Item().Value
have ()
want (func([]byte) error)
FAIL github.com/aergoio/SMT [build failed]
Error: Tests failed.