The non-relational database specialist's stock is up significantly from its recent 52-week lows. MongoDB (MDB -2.91%) stock has experienced considerable volatility this year. The next-generation database company's market cap has fallen by nearly half from where it peaked on Feb. 9 as slowing sales growth led investors to question its valuation. Still, that lower share price gives investors reason to take another look at its value proposition, and the stock has twice bounced off of recent lows. Should invest ...