title: AWS Glue: Do I really need a Crawler for new content?
body: <p>What I understand from the AWS Glue docs is a craweler will help crawl and discover new data. However, I noticed that once I crawled once, if new data goes into S3, the data is actually already discovered when I query the data catalog from Athena for example. So, can I say I do not need a crawler to crawl everytime new data is added, unless there are new schemas?</p>
  
  <p>In fact, if I know the schema of the files, I can just manually create the table and do without a crawler, am I correct?  </p>