我有大约4 GB数据的数据库，当我尝试通过mongodump转储它时，它只转储大约1,93 GB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？
感谢您的帮助，抱歉我的英语不好（我希望您能理解我）。
修改
{
"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
}
答案 0 :(得分：0)
数据很可能都存在; MongoDB会随着时间的推移分配额外的空间，而这些空间不会包含在副本中。检查集合中的doc计数以进行验证。