?= ?Please ensure that you set the default write concern for the database bysetting ? ?= ? ?= ? one of the options ? ? ? ? ? = ? ?= ? ? ? ? ? = ? ?= ? ? w: (value of > -1 or the string 'majority'), where < 1 means ? ? ? ? ? = ? ?= ? ? ? ?no write acknowledgement ? ? ? ? ? ?= ? ?= ? ? journal: true/false, wait for flush to journal before acknowledgement ? ? ? ? ? ?= ? ?= ? ? fsync: true/false, wait for flush to file system before acknowledgement ? ? ? ? ? = ? ?= ? ? ? ? ? = ? ?= ?For backward compatibility safe is still supported and ? ? ? ? ? = ? ?= ? allows values of [true | false | {j:true} | {w:n, wtimeout:n} | {fsync:true}] ? ? ?= ? ?= ? the default value is false which means the driver receives does not ? ? ? ? ? = ? ?= ? return the information of the success/error of the insert/update/remove ? ? ? ? ? = ? ?= ? ? ? ? ? = ? ?= ? ex: new Db(new Server('localhost', 27017), {safe:false}) ? ? ? ? ? = ? ?= ? ? ? ? ? = ? ?= ? http://www.mongodb.org/display/DOCS/getLastError+Command ? ? ? ? ? = ? ?= ? ? ? ? ? = ? ?= ?The default of no acknowledgement will change in the very near future ? ? ? ? ? ?= ? ?= ? ? ? ? ? = ? ?= ?This message will disappear when the default safe is set on the driver Db ? ? ? ? ? = ? ?=============================

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