What's this file

There are some different file In my couchbase Install Directory
like ‘/opt/couchbase/var/lib/couchbase/core.xxx’ ,i don’t what does those file are,they are prettily take space

Hi, these files are most likely memcached core dumps, indicating that the memcached process has crashed, several times apparently.

,thank you very much

does core dumps includs my data? can i recovery use these file?

No, core dump contains data about the state of your process when it crashed. It’s useful for debugging mostly.