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 程式師世界 >> 數據庫知識 >> MongoDB數據庫 >> MongoDB綜合知識 >> MongoDB整庫備份與還原以及單個collection備份、恢復方法

MongoDB整庫備份與還原以及單個collection備份、恢復方法

編輯:MongoDB綜合知識
mongodump.exe備份的原理是通過一次查詢獲取當前服務器快照,並將快照寫入磁盤中,因此這種方式保存的也不是實時的,因為在獲取快照後,服務器還會有數據寫入,為了保證備份的安全,同樣我們還是可以利用fsync鎖使服務器數據暫時寫入緩存中。

高效開源數據庫(mongodb)下載地址:http://www.jb51.net/softs/41751.html

備份前的檢查
> show dbs
MyDB 0.0625GB
admin (empty)
bruce 0.0625GB
local (empty)
test 0.0625GB
> use MyDB
switched to db MyDB
> db.users.find()
{ "_id" : ObjectId("4e290aa39a1945747b28f1ee"), "a" : 1, "b" : 1 }
{ "_id" : ObjectId("4e2cd2182a65c81f21566318"), "a" : 3, "b" : 5 }
>

整庫備份:
mongodump -h dbhost -d dbname -o dbdirectory
-h:MongDB所在服務器地址,例如:127.0.0.1,當然也可以指定端口號:127.0.0.1:27017
-d:需要備份的數據庫實例,例如:test
-o:備份的數據存放位置,例如:c:\data\dump,當然該目錄需要提前建立,在備份完成後,系統自動在dump目錄下建立一個test目錄,這個目錄裡面存放該數據庫實例的備份數據。

mongodump的官方說明(可通過mongodump --help查看):
options:
 --help          produce help message
 -v [ --verbose ]     be more verbose (include multiple times for more
              verbosity e.g. -vvvvv)
 --version        print the program's version and exit
 -h [ --host ] arg    mongo host to connect to ( /s1,s2 for
              sets)
 --port arg        server port. Can also use --host hostname:port
 --ipv6          enable IPv6 support (disabled by default)
 -u [ --username ] arg  username
 -p [ --password ] arg  password
 --dbpath arg       directly access mongod database files in the given
              path, instead of connecting to a mongod server -
              needs to lock the data directory, so cannot be used
              if a mongod is currently accessing the same path
 --directoryperdb     if dbpath specified, each db is in a separate
              directory
 --journal        enable journaling
 -d [ --db ] arg     database to use
 -c [ --collection ] arg collection to use (some commands)
 -o [ --out ] arg (=dump) output directory or "-" for stdout
 -q [ --query ] arg    json query
 --oplog         Use oplog for point-in-time snapshotting
 --repair         try to recover a crashed database
 --forceTableScan     force a table scan (do not use $snapshot)

整庫恢復:
mongorestore -h dbhost -d dbname –directoryperdb dbdirectory
-h:MongoDB所在服務器地址
-d:需要恢復的數據庫實例,例如:test,當然這個名稱也可以和備份時候的不一樣,比如test2
–directoryperdb:備份數據所在位置,例如:c:\data\dump\test,這裡為什麼要多加一個test,而不是備份時候的dump,讀者自己查看提示吧!
–drop:恢復的時候,先刪除當前數據,然後恢復備份的數據。就是說,恢復後,備份後添加修改的數據都會被刪除,慎用哦!

mongorestore的官方說明(可通過mongorestore --help查看):
options:
 --help         produce help message
 -v [ --verbose ]    be more verbose (include multiple times for more
             verbosity e.g. -vvvvv)
 --version        print the program's version and exit
 -h [ --host ] arg    mongo host to connect to ( /s1,s2 for sets)
 --port arg       server port. Can also use --host hostname:port
 --ipv6         enable IPv6 support (disabled by default)
 -u [ --username ] arg  username
 -p [ --password ] arg  password
 --dbpath arg      directly access mongod database files in the given
             path, instead of connecting to a mongod server -
             needs to lock the data directory, so cannot be used
             if a mongod is currently accessing the same path
 --directoryperdb    if dbpath specified, each db is in a separate
             directory
 --journal        enable journaling
 -d [ --db ] arg     database to use
 -c [ --collection ] arg collection to use (some commands)
 --objcheck       validate object before inserting
 --filter arg      filter to apply before inserting
 --drop         drop each collection before import
 --oplogReplay      replay oplog for point-in-time restore
 --oplogLimit arg    exclude oplog entries newer than provided timestamp
             (epoch[:ordinal])
 --keepIndexVersion   don't upgrade indexes to newest version
 --noOptionsRestore   don't restore collection options
 --noIndexRestore    don't restore indexes
 --w arg (=1)      minimum number of replicas per write

單個collection備份:
mongoexport -h dbhost -d dbname -c collectionname -f collectionKey -o dbdirectory
-h: MongoDB所在服務器地址
-d: 需要恢復的數據庫實例
-c: 需要恢復的集合
-f: 需要導出的字段(省略為所有字段)
-o: 表示導出的文件名

mongoexport的官方說明(可通過mongoexport --help查看):
 --help          produce help message
 -v [ --verbose ]     be more verbose (include multiple times for more
              verbosity e.g. -vvvvv)
 --version         print the program's version and exit
 -h [ --host ] arg     mongo host to connect to ( /s1,s2 for
              sets)
 --port arg        server port. Can also use --host hostname:port
 --ipv6          enable IPv6 support (disabled by default)
 -u [ --username ] arg   username
 -p [ --password ] arg   password
 --dbpath arg       directly access mongod database files in the given
              path, instead of connecting to a mongod server -
              needs to lock the data directory, so cannot be used
              if a mongod is currently accessing the same path
 --directoryperdb     if dbpath specified, each db is in a separate
              directory
 --journal         enable journaling
 -d [ --db ] arg      database to use
 -c [ --collection ] arg  collection to use (some commands)
 -f [ --fields ] arg    comma separated list of field names e.g. -f
              name,age
 --fieldFile arg      file with fields names - 1 per line
 -q [ --query ] arg    query filter, as a JSON string
 --csv           export to csv instead of json
 -o [ --out ] arg     output file; if not specified, stdout is used
 --jsonArray        output to a json array rather than one object per
              line
 -k [ --slaveOk ] arg (=1) use secondaries for export if available, default
              true
 --forceTableScan     force a table scan (do not use $snapshot)

單個collection恢復:
mongoimport -d dbhost -c collectionname –type csv –headerline –file
-type: 指明要導入的文件格式
-headerline: 批明不導入第一行,因為第一行是列名
-file: 指明要導入的文件路徑

mongoimport的官方說明(可通過mongoimport --help查看):
 --help         produce help message
 -v [ --verbose ]    be more verbose (include multiple times for more
             verbosity e.g. -vvvvv)
 --version        print the program's version and exit
 -h [ --host ] arg    mongo host to connect to ( /s1,s2 for sets)
 --port arg       server port. Can also use --host hostname:port
 --ipv6         enable IPv6 support (disabled by default)
 -u [ --username ] arg  username
 -p [ --password ] arg  password
 --dbpath arg      directly access mongod database files in the given
             path, instead of connecting to a mongod server -
             needs to lock the data directory, so cannot be used
             if a mongod is currently accessing the same path
 --directoryperdb    if dbpath specified, each db is in a separate
             directory
 --journal        enable journaling
 -d [ --db ] arg     database to use
 -c [ --collection ] arg collection to use (some commands)
 -f [ --fields ] arg   comma separated list of field names e.g. -f name,age
 --fieldFile arg     file with fields names - 1 per line
 --ignoreBlanks     if given, empty fields in csv and tsv will be ignored
 --type arg       type of file to import. default: json (json,csv,tsv)
 --file arg       file to import from; if not specified stdin is used
 --drop         drop collection first
 --headerline      CSV,TSV only - use first line as headers
 --upsert        insert or update objects that already exist
 --upsertFields arg   comma-separated fields for the query part of the
             upsert. You should make sure this is indexed
 --stopOnError      stop importing at first error rather than continuing
 --jsonArray       load a json array, not one item per line. Currently
             limited to 16MB.

其他導入與導出操作:

1. mongoimport -d my_mongodb -c user user.dat

參數說明:

-d 指明使用的庫, 本例中為” my_mongodb”

-c 指明要導出的表, 本例中為”user”

可以看到導入數據的時候會隱式創建表結構

2. mongoexport -d my_mongodb -c user -o user.dat

參數說明:

-d 指明使用的庫, 本例中為” my_mongodb”

-c 指明要導出的表, 本例中為”user”

-o 指明要導出的文件名, 本例中為”user.dat”

從上面可以看到導出的方式使用的是JSON 的樣式.

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