implementation

interface for interacting with database
Memtable for storing data into RAM
SSTable to flush data to disk (file) when memtable is full
LSM tree to search for key into disk efficiently
adding tombstone to delete operations
adding sstable compaction process after certain threshold
db.close() method to close db(save data in persistent format)

to-do

adding bloom filter to check is key exist or not before start checking
optimising search - find key inside presistent sstable table