upgrading mongoDB to 2.0

apt_asking.txt

Configuration file `/etc/mongodb.conf'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** mongodb.conf (Y/I/N/O/D/Z) [default=N] ? D

mongo.conf.diff

--- /etc/mongodb.conf   2011-09-14 17:27:16.895781959 +0900
+++ /etc/mongodb.conf.dpkg-new  2011-09-13 00:17:42.000000000 +0900
@@ -14,7 +14,8 @@
 
 #port = 27017
 
-
+# Disables write-ahead journaling
+# nojournal = true
 
 # Enables periodic logging of CPU utilization and I/O wait
 #cpu = true
@@ -41,9 +42,6 @@
 #   7=W+some reads
 #diaglog = 0
 
-# Diagnostic/debugging option
-#nocursors = true
-
 # Ignore query hints
 #nohints = true
 
@@ -86,9 +84,3 @@
 
 # in replica set configuration, specify the name of the replica set
 # replSet = setname 
-
-# turn journaling on.
-journal = true
-
-# enable rest access for mongo web interface
-rest =true

result_of_stats.json

> db.stats()           
{
	"db" : "hogehoge_development",
	"collections" : 18,
	"objects" : 16907,
	"avgObjSize" : 162.2712485952564,
	"dataSize" : 2743520,
	"storageSize" : 129996800,
	"numExtents" : 36,
	"indexes" : 31,
	"indexSize" : 1204224,
	"fileSize" : 251658240,
	"ok" : 1
}

result_of_stats_2.0.json

> db.stats()
{
	"db" : "hogehoge_development",
	"collections" : 18,
	"objects" : 16895,
	"avgObjSize" : 162.31618822136727,
	"dataSize" : 2742332,
	"storageSize" : 130017280,
	"numExtents" : 37,
	"indexes" : 25,
	"indexSize" : 752224,
	"fileSize" : 251658240,
	"nsSizeMB" : 16,
	"ok" : 1
}