#激活 数据库分片
db.runCommand( { enablesharding : "elain" } );
要使单个collection也分片存储，需要给collection指定一个分片key，通过以下命令操作：
db.runCommand( { shardcollection : “”,key : db.chujq.t1.stats();
{
"sharded" : true,
"flags" : 1,
"ns" : "elain.test",
"count" : 4058977,
"numExtents" : 34,
"size" : 675039816,
"storageSize" : 818757632,
"totalIndexSize" : 131854352,
"indexSizes" : {
"_id_" : 131854352
},
"avgObjSize" : 166.30786919955446,
"nindexes" : 1,
"nchunks" : 14,
"shards" : {
"shard1" : {
"ns" : "elain.test",
"count" : 1860365,
"size" : 309376352,
"avgObjSize" : 166.29873815084673,
"storageSize" : 408920064,
"numExtents" : 16,
"nindexes" : 1,
"lastExtentSize" : 77955072,
"paddingFactor" : 1,
"flags" : 1,
"totalIndexSize" : 60371584,
"indexSizes" : {
"_id_" : 60371584
},
"ok" : 1
},
"shard2" : {
"ns" : "elain.test",
"count" : 2198612,
"size" : 365663464,
"avgObjSize" : 166.31559547569103,
"storageSize" : 409837568,
"nindexes" : 1,
"lastExtentSize" : 74846208,
"paddingFactor" : 1,
"flags" : 1,
"totalIndexSize" : 71482768,
"indexSizes" : {
"_id_" : 71482768
},
"ok" : 1
}
},
"ok" : 1
}
删除片操作
mongos> db.runCommand({"removeshard" : "10.0.0.11:27018"});
{
"msg" : "draining started successfully",
"state" : "started",
"shard" : "shard2",
"ok" : 1
}
再执行，可看到removeshard的挪动进度
mongos> db.runCommand({"removeshard" : "10.0.0.11:27018"});
{
"msg" : "draining ongoing",
"state" : "ongoing",
"remaining" : {
"chunks" : NumberLong(3),
"dbs" : NumberLong(0)
},
"ok" : 1
}
例:
/elain/apps/mongodb/bin/mongod --config /elain/data/mongodb/shard1/shard1.properties --rest
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