現(xiàn)在一個實(shí)例里有 DBA, DBB, DBC, NewDB，如何把ABC導(dǎo)入到NewDB？
結(jié)構(gòu)是一樣的，試過For Insert 和 InsertMany，但是數(shù)據(jù)有接近500W，插了沒幾條就不工作了。而且效率太低。
請問有什么高效的辦法嗎？
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認(rèn)證0級講師
如果是復(fù)制集的話倒是有辦法，不是十分直觀不過我們有renameCollection Command:
注意：務(wù)必讀完上面的鏈接再動手。
{ renameCollection: "<source_namespace>", to: "<target_namespace>", dropTarget: <true|false> }| Field | Type | Description |
|---|---|---|
| renameCollection | string | The namespace of the collection to rename. The namespace is a combination of the database name and the name of the collection. |
| to | string | The new namespace of the collection. If the new namespace specifies a different database, the renameCollection command copies the collection to the new database and drops the source collection. |
| dropTarget | boolean | Optional. If true, mongod will drop the target of renameCollection prior to renaming the collection. The default value is false. |
Example:
use admin
db.runCommand( { renameCollection: "DBA.xxx", to: "NewDB.xxx" } )
db.runCommand( { renameCollection: "DBA.yyy", to: "NewDB.yyy" } )
...
