LASTSAVE
Available since: 1.0.0
Time complexity: O(1)
ACL categories:
@admin
@fast
@dangerous
Return the UNIX TIME of the last DB save executed with success.
A client may check if a BGSAVE command succeeded reading the LASTSAVE value,
then issuing a BGSAVE command and checking at regular intervals every N
seconds if LASTSAVE changed.
Return
Integer reply: an UNIX time stamp.