LASTSAVE
Syntax
        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. Redis considers the database saved successfully at startup.