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+
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+##MongoDB 备份数据库
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+
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+ bin/mongodump -h 192.168.1.107:40000 -d nsmongo -c postStore -q {"createdAt" : {"$gte": new Date(2013,4,1,0,0,0), "$lt" : new Date(2013, 5, 1, 0, 0, 0)}} -o /data/back/
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+
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+---
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+
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+ bin/mongodump --help
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+ --help produce help message
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+ -v [ --verbose ] be more verbose (include multiple times
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+ for more verbosity e.g. -vvvvv)
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+ --version print the program's version and exit
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+ -h [ --host ] arg mongo host to connect to ( <set
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+ name>/s1,s2 for sets)
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+ --port arg server port. Can also use --host
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+ hostname:port
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+ --ipv6 enable IPv6 support (disabled by
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+ default)
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+ -u [ --username ] arg username
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+ -p [ --password ] arg password
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+ --authenticationDatabase arg user source (defaults to dbname)
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+ --authenticationMechanism arg (=MONGODB-CR)
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+ authentication mechanism
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+ --dbpath arg directly access mongod database files
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+ in the given path, instead of
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+ connecting to a mongod server - needs
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+ to lock the data directory, so cannot
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+ be used if a mongod is currently
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+ accessing the same path
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+ --directoryperdb each db is in a separate directly
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+ (relevant only if dbpath specified)
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+ --journal enable journaling (relevant only if
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+ dbpath specified)
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+ -d [ --db ] arg database to use
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+ -c [ --collection ] arg collection to use (some commands)
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+ -o [ --out ] arg (=dump) output directory or "-" for stdout
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+ -q [ --query ] arg json query
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+ --oplog Use oplog for point-in-time
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+ snapshotting
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+ --repair try to recover a crashed database
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+ --forceTableScan force a table scan (do not use
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+ $snapshot)
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+
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+---
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+
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+ mongodump -h dbhost -d dbname -o dbdirectory
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+
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+ - -h：MongDB所在服务器地址，例如：127.0.0.1，当然也可以指定端口号：127.0.0.1:27017
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+ - -d：需要备份的数据库实例，例如：test
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+ - -o：备份的数据存放位置，例如：c:\data\dump，当然该目录需要提前建立，在备份完成后，系统自动在dump目录下建立一个test目录，这个目录里面存放该数据库实例的备份数据。
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+
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+
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+##MongoDB 恢复数据库
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+
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+ mongorestore -h 192.168.1.107 -p 40000 --d nsmongo -c postStore --directoryperdb /data/back/nsmongo
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+
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+---
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+
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+ bin/mongorestore --help
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+ -h [ --host ] arg mongo host to connect to ( <set name>/s1,s2 for sets)
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+ --port arg server port. Can also use --host hostname:port
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+ --ipv6 enable IPv6 support (disabled by default)
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+ -u [ --username ] arg username
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+ -p [ --password ] arg password
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+ --authenticationDatabase arg user source (defaults to dbname)
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+ --authenticationMechanism arg (=MONGODB-CR) authentication mechanism
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+ --dbpath arg directly access mongod database files
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+ in the given path, instead of
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+ connecting to a mongod server - needs
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+ to lock the data directory, so cannot
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+ be used if a mongod is currently
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+ accessing the same path
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+ --directoryperdb each db is in a separate directly (relevant only if dbpath specified)
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+ --journal enable journaling (relevant only if dbpath specified)
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+ -d [ --db ] arg database to use
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+ -c [ --collection ] arg collection to use (some commands)
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+ --objcheck validate object before inserting (default)
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+ --noobjcheck don't validate object before inserting
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+ --filter arg filter to apply before inserting
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+ --drop
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+
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+---
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+
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+ mongorestore -h dbhost -d dbname --directoryperdb dbdirectory
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+
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+ - -h：MongoDB所在服务器地址
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+ - -d：需要恢复的数据库实例，例如：test，当然这个名称也可以和备份时候的不一样，比如test2
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+ - --directoryperdb：备份数据所在位置，例如：c:\data\dump\test，这里为什么要多加一个test，而不是备份时候的dump，读者自己查看提示吧！
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+ - --drop：恢复的时候，先删除当前数据，然后恢复备份的数据。就是说，恢复后，备份后添加修改的数据都会被删除，慎用
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ZhenQin