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我的用例支持上限集合。因此,尝试将现有的无上限集合转换或复制到上限集合。转换/复制成功。但问题是没有足够的记录作为原始包含。

无上限收藏:

db.com.bigd.raw.stats()
{
        "ns" : "dbname.com.bigd.raw",
        "count" : 84536,
        "size" : 41929856,
        "avgObjSize" : 496,
        "numExtents" : 9,
        "storageSize" : 58441728,
        "lastExtentSize" : 20643840,
        "paddingFactor" : 1,
        "paddingFactorNote" : "paddingFactor is unused and unmaintained in 3.0. It remains hard coded to 1.0 for compatibility only.",
        "userFlags" : 1,
        "capped" : false,
        "nindexes" : 1,
        "totalIndexSize" : 3515680,
        "indexSizes" : {
                "_id_" : 3515680
        },
        "ok" : 1

}

运行命令转换为上限:

db.runCommand({convertToCapped:'com.bigd.raw', size:100000})

封顶系列:

db.com.bigd.raw.stats()
{
        "ns" : "dbname.com.bigd.raw",
        "count" : 293,
        "size" : 97188,
        "avgObjSize" : 331,
        "numExtents" : 1,
        "storageSize" : 102400,
        "lastExtentSize" : 102400,
        "paddingFactor" : 1,
        "paddingFactorNote" : "paddingFactor is unused and unmaintained in 3.0. It remains hard coded to 1.0 for compatibility only.",
        "userFlags" : 1,
        "capped" : true,
        "max" : NumberLong("9223372036854775807"),
        "maxSize" : 102400,
        "nindexes" : 1,
        "totalIndexSize" : 24528,
        "indexSizes" : {
                "_id_" : 24528
        },
        "ok" : 1
}

这里的计数已减少到 293,而原来的计数为 84536。

mongodumpon uncapped 和mongorestore创建 capped collection( db.createCollection("com.bigd.raw", {capped : true, size :100000}))也是如此。

使用 mongov3.0.7

帮助表示赞赏。

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