MongoDB Study #17 GridFS

1. Grid File System

대용량 File을 Database에 Upload / Download 할 수 있는 기능을 제공합니다. (최대 16MB)
파일은 255KB의 Chunk 단위로 분리되어 Document로 저장됩니다.

실습을 위해서 http://www.pitmongo.co.kr 의 기술자료 폴더로 가셔서
BIG_EMP.TXT 파일을 다운로드 받으신 후 MongoDB 가 설치된 bin 폴더로 복사하세요.

C:\MongoDB\bin>mongofiles list 2015-08-12T09:17:16.859+0900    connected to: localhost C:\MongoDB\bin>mongofiles put BIG_EMP.TXT         // Upload 2015-08-12T09:17:34.646+0900    connected to: localhost added file: BIG_EMP.TXT C:\MongoDB\bin>mongofiles list 2015-08-12T09:18:47.560+0900    connected to: localhost BIG_EMP.TXT     2892607 C:\MongoDB\bin>mongo > show collections ... fs.chunks fs.files ... > show dbs admin  0.078GB local  0.078GB test   0.203GB > db.fs.files.find().pretty() {         "_id" : ObjectId("55ca909ef867d6336c000001"),         "chunkSize" : 261120,         "uploadDate" : ISODate("2015-08-12T00:17:34.690Z"),         "length" : 2892607,         "md5" : "5847679427ed8528c2b0103d1923bff4",         "filename" : "BIG_EMP.TXT" } > exit bye C:\MongoDB\bin>del BIG_EMP.TXT C:\MongoDB\bin>mongofiles get BIG_EMP.TXT          // Download 2015-08-12T09:20:37.386+0900    connected to: localhost finished writing to: BIG_EMP.TXT C:\MongoDB\bin>dir ... 2015-08-12  오전 09:20         2,892,607 BIG_EMP.TXT ... C:\MongoDB\bin>mongofiles delete BIG_EMP.TXT 2015-08-12T09:36:45.153+0900    connected to: localhost successfully deleted all instances of 'BIG_EMP.TXT' from GridFS C:\MongoDB\bin>mongo > db.fs.chunks.find() > db.fs.files.validate() {         "ns" : "test.fs.files",         "datasize" : 0,         "nrecords" : 0,         "lastExtentSize" : 8192,         "firstExtent" : "0:201000 ns:test.fs.files",         "lastExtent" : "0:201000 ns:test.fs.files",         "extentCount" : 1,         "firstExtentDetails" : {                 "loc" : "0:201000",                 "xnext" : "null",                 "xprev" : "null",                 "nsdiag" : "test.fs.files",                 "size" : 8192,                 "firstRecord" : "null",                 "lastRecord" : "null"         },         "deletedCount" : 2,         "deletedSize" : 8016,         "nIndexes" : 1,         "keysPerIndex" : {                 "test.fs.files.$_id_" : 0         },         "valid" : true,         "errors" : [ ],         "warning" : "Some checks omitted for speed. use {full:true} option to do more thorough scan.",         "ok" : 1 }