mongodb 里有类似 mysql 的 information_schema 这种存储元数据的数据库吗 - V2EX
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zxCoder
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mongodb 里有类似 mysql 的 information_schema 这种存储元数据的数据库吗

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  •   zxCoder 2020-12-05 10:00:53 +08:00 1493 次点击
    这是一个创建于 1778 天前的主题,其中的信息可能已经有所发展或是发生改变。

    mongodb 里有类似 mysql 的 information_schema 这种存储元数据的数据库吗

    听说以前的版本有 system.namespaces system.indexes,4.2 版本后取消了,现在应该在哪找呢?

    7 条回复    2020-12-05 10:49:40 +08:00
    zxCoder
        1
    zxCoder  
    OP
       2020-12-05 10:12:25 +08:00
    英文好难理解啊


    MongoDB stores system information in collections that use the <database>.system.* namespace, which MongoDB reserves for internal use. Do not create collections that begin with system.

    文档这说的是 <database>.system.* namespace 这些 collection 只用于内部使用? root 角色也不能查吗
    yonng
        2
    yonng  
       2020-12-05 10:26:51 +08:00 via iPhone
    看文档描述是预留的防止冲突不让用而已,和 root 没啥关系
    zxCoder
        3
    zxCoder  
    OP
       2020-12-05 10:31:04 +08:00
    @yonng 不让用的意思是不能查吗
    echowuhao
        4
    echowuhao  
       2020-12-05 10:39:38 +08:00
    你打开 mongo shell 试试不就可以了么。。。
    zxCoder
        5
    zxCoder  
    OP
       2020-12-05 10:40:48 +08:00
    @echowuhao 。。。。
    echowuhao
        6
    echowuhao  
       2020-12-05 10:41:39 +08:00
    <database>.system.namespaces
    REMOVED IN 4.2

    Starting in MongoDB 4.2, <database>.system.namespaces has been removed (access to the collection has been deprecated since 3.0). To list the collections in a database, use the listCollections command instead.

    <database>.ystem.indexes
    REMOVED IN 4.2

    Starting in MongoDB 4.2, <database>.system.indexes has been removed (access to the collection has been deprecated since 3.0). To list the inndexes, use the listIndexes command instead.


    listCollections listIndexes 文档写好的。你只要 google 一下。
    zxCoder
        7
    zxCoder  
    OP
       2020-12-05 10:49:40 +08:00
    @echowuhao 这个我知道,我的问题是 mongodb 里有类似 mysql 的 information_schema 这种存储元数据的数据库吗
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