//这个是普通集合
db.createCollection(“c1”);
> db.c3.stats(); { "ns" : "test.c3", "count" : 0, "size" : 0, "storageSize" : 8192, "numExtents" : 1, "nindexes" : 1, "lastExtentSize" : 8192, "paddingFactor" : 1, "flags" : 1, "totalIndexSize" : 8192, "indexSizes" : { "_id_" : 8192 }, "ok" : 1 }
如果要把普通集合转换成固定集合
db.runCommand({convertToCapped:”c3″,size:10000000,max:3});
//这个是固定集合
db.createCollection(“c4”,{capped:true,size:10000000,max:5}); //capped代表固定集合,size:单位是k 这里表示10M,最大存储5个json,储存最新的,去掉最旧的 适合存储日志
> db.c4.stats(); { "ns" : "test.c4", "count" : 0, "size" : 0, "storageSize" : 10000128, "numExtents" : 1, "nindexes" : 0, "lastExtentSize" : 10000128, "paddingFactor" : 1, "flags" : 0, "totalIndexSize" : 0, "indexSizes" : { }, "capped" : 1, "max" : 5, "ok" : 1 }
//储存文件
./mongofiles put mongosniff.tar.gz
[root@localhost bin]# ./mongofiles put mongosniff.tar.gz
connected to: 127.0.0.1
added file: { _id: ObjectId(‘50408b4ed776b01713c405d2’), filename: “mongosniff.tar.gz”, chunkSize: 262144, uploadDate: new Date(1346407255724), md5: “6e006328d829c667c5b36cf35e7e4e50”, length: 453717 }
done!
chunkSize 块大小 继续阅读