MongoDB克隆（db.copyDatabase），只克隆数据库的一半
我有一个数据库，它有大约4GB的数据，当我尝试通过mongodump转储它时，它只转储大约1,93GB的数据。当我尝试通过MongoDB克隆（db.copyDatabase），只克隆数据库的一半,mongodb,Mongodb,我有一个数据库，它有大约4GB的数据，当我尝试通过mongodump转储它时，它只转储大约1,93GB的数据。当我尝试通过db.copyDatabase（）克隆它时，它会复制与mongodump相同数量的数据 MongoDb有一些限制吗 谢谢你的帮助，很抱歉我的英语不好（我希望你能理解我） 编辑 { "ns" : "some-db.persons", "firstExtent" : "0:31000 ns:some-db.persons", "la
db.copyDatabase（）{
"ns" : "some-db.persons",
"firstExtent" : "0:31000 ns:some-db.persons",
"lastExtent" : "4:b50d000 ns:some-db.persons",
"extentCount" : 13,
"extents" : [
{
"loc" : "0:31000",
"xnext" : "0:42000",
"xprev" : "null",
"nsdiag" : "some-db.persons",
"size" : 32768,
"firstRecord" : "0:310b0",
"lastRecord" : "0:38e3c"
},
{
"loc" : "0:42000",
"xnext" : "0:62000",
"xprev" : "0:31000",
"nsdiag" : "some-db.persons",
"size" : 131072,
"firstRecord" : "0:420b0",
"lastRecord" : "0:61e64"
},
{
"loc" : "0:62000",
"xnext" : "0:e2000",
"xprev" : "0:42000",
"nsdiag" : "some-db.persons",
"size" : 524288,
"firstRecord" : "0:620b0",
"lastRecord" : "0:e0f0c"
},
{
"loc" : "0:e2000",
"xnext" : "0:372000",
"xprev" : "0:62000",
"nsdiag" : "some-db.persons",
"size" : 2097152,
"firstRecord" : "0:e20b0",
"lastRecord" : "0:2e1d94"
},
{
"loc" : "0:372000",
"xnext" : "0:dd6000",
"xprev" : "0:e2000",
"nsdiag" : "some-db.persons",
"size" : 8388608,
"firstRecord" : "0:3720b0",
"lastRecord" : "0:b71e80"
},
{
"loc" : "0:dd6000",
"xnext" : "0:2233000",
"xprev" : "0:372000",
"nsdiag" : "some-db.persons",
"size" : 11325440,
"firstRecord" : "0:dd60b0",
"lastRecord" : "0:18a2db8"
},
{
"loc" : "0:2233000",
"xnext" : "1:2000",
"xprev" : "0:dd6000",
"nsdiag" : "some-db.persons",
"size" : 15290368,
"firstRecord" : "0:22330b0",
"lastRecord" : "0:30c7e20"
},
{
"loc" : "1:2000",
"xnext" : "1:223d000",
"xprev" : "0:2233000",
"nsdiag" : "some-db.persons",
"size" : 20643840,
"firstRecord" : "1:20b0",
"lastRecord" : "1:13b1e9c"
},
{
"loc" : "1:223d000",
"xnext" : "2:2000",
"xprev" : "1:2000",
"nsdiag" : "some-db.persons",
"size" : 27869184,
"firstRecord" : "1:223d0b0",
"lastRecord" : "1:3cd0e7c"
},
{
"loc" : "2:2000",
"xnext" : "2:73ba000",
"xprev" : "1:223d000",
"nsdiag" : "some-db.persons",
"size" : 37625856,
"firstRecord" : "2:20b0",
"lastRecord" : "2:23e3dd8"
},
{
"loc" : "2:73ba000",
"xnext" : "3:4bd7000",
"xprev" : "2:2000",
"nsdiag" : "some-db.persons",
"size" : 50798592,
"firstRecord" : "2:73ba0b0",
"lastRecord" : "2:a42be78"
},
{
"loc" : "3:4bd7000",
"xnext" : "4:b50d000",
"xprev" : "2:73ba000",
"nsdiag" : "some-db.persons",
"size" : 68579328,
"firstRecord" : "3:4bd70b0",
"lastRecord" : "3:8d3dda4"
},
{
"loc" : "4:b50d000",
"xnext" : "null",
"xprev" : "3:4bd7000",
"nsdiag" : "some-db.persons",
"size" : 92581888,
"firstRecord" : "4:b50d0b0",
"lastRecord" : "4:ba17118"
}
],
"datasize" : 244286608,
"nrecords" : 268872,
"lastExtentSize" : 92581888,
"padding" : 1,
"firstExtentDetails" : {
"loc" : "0:31000",
"xnext" : "0:42000",
"xprev" : "null",
"nsdiag" : "some-db.persons",
"size" : 32768,
"firstRecord" : "0:310b0",
"lastRecord" : "0:38e3c"
},
"lastExtentDetails" : {
"loc" : "4:b50d000",
"xnext" : "null",
"xprev" : "3:4bd7000",
"nsdiag" : "some-db.persons",
"size" : 92581888,
"firstRecord" : "4:b50d0b0",
"lastRecord" : "4:ba17118"
},
"objectsFound" : 218678,
"invalidObjects" : 0,
"bytesWithHeaders" : 207046812,
"bytesWithoutHeaders" : 203547964,
"deletedCount" : 6,
"deletedSize" : 87297536,
"nIndexes" : 1,
"keysPerIndex" : {
"some-db.persons.$_id_" : 268872
},
"valid" : true,
"errors" : [ ],
"ok" : 1
}
数据可能都在那里；MongoDB会随着时间的推移分配拷贝中不会包含的额外空间。检查要验证的集合中的文档计数。好的，我检查过了。我所拥有的第一次收集全部96279份文档，第二次收集仅70596份文档，共268872份文档。我有一个想法，我将尝试只复制第二个集合。@user1607808-Hmm…您是否验证源集合以检查它们是否存在问题
db.mycoll.validate（）db.mycoll.validate（{full:true}）