MongoDB safe and fsync Explained
Kristina Chodorow explains the MongoDB safe and fsync options:
safe and fsync are not the same, here’s a rundown of the options:
safe=> false: do not wait for a db responsesafe=> true: wait for a db responsesafe=> num: wait for that many servers to have the write before returning
fsync=> true: fsync the write to disk before returning.fsync=> true impliessafe=>true, but not visa versa.- If
fsync=>false andsafe=>true and the write could be in successfully applied to a mmapped file but not yet written to disk.
Related to MongoDB durability.
Original title and link for this post: MongoDB safe and fsync Explained (published on the NoSQL blog: myNoSQL)
via: http://groups.google.com/group/mongodb-user/msg/36ba2b821c438728
