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Compaction/Fragmentation example
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| // mongodb 2.4.8 | |
| // fragmented | |
| // initial setting of random rand of 5000 | |
| > use sbtest | |
| switched to db sbtest | |
| > db.stats() | |
| { | |
| "db" : "sbtest", | |
| "collections" : 19, | |
| "objects" : 4000088, | |
| "avgObjSize" : 2670.082581183214, | |
| "dataSize" : 10680565292, | |
| "storageSize" : 12709412864, | |
| "numExtents" : 270, | |
| "indexes" : 34, | |
| "indexSize" : 250479936, | |
| "fileSize" : 14471921664, | |
| "nsSizeMB" : 16, | |
| "dataFileVersion" : { | |
| "major" : 4, | |
| "minor" : 5 | |
| }, | |
| "ok" : 1 | |
| } | |
| > db.repairDatabase(); | |
| { "ok" : 1 } | |
| > db.stats() | |
| { | |
| "db" : "sbtest", | |
| "collections" : 19, | |
| "objects" : 4000088, | |
| "avgObjSize" : 2649.1415768853085, | |
| "dataSize" : 10596799432, | |
| "storageSize" : 12838596608, | |
| "numExtents" : 270, | |
| "indexes" : 34, | |
| "indexSize" : 201734624, | |
| "fileSize" : 14471921664, | |
| "nsSizeMB" : 16, | |
| "dataFileVersion" : { | |
| "major" : 4, | |
| "minor" : 5 | |
| }, | |
| "ok" : 1 | |
| } | |
| > | |
| //dump, restored | |
| > db.stats() | |
| { | |
| "db" : "sbtest", | |
| "collections" : 19, | |
| "objects" : 4000088, | |
| "avgObjSize" : 2649.1418368795885, | |
| "dataSize" : 10596800472, | |
| "storageSize" : 12899418112, | |
| "numExtents" : 249, | |
| "indexes" : 34, | |
| "indexSize" : 212723168, | |
| "fileSize" : 14471921664, | |
| "nsSizeMB" : 16, | |
| "dataFileVersion" : { | |
| "major" : 4, | |
| "minor" : 5 | |
| }, | |
| "ok" : 1 | |
| } | |
| // now if we start with range of 0-25000, then subsequently choose 5000, then we get more fragmentation | |
| > use sbtest | |
| switched to db sbtest | |
| > db.stats() | |
| { | |
| "db" : "sbtest", | |
| "collections" : 19, | |
| "objects" : 400087, | |
| "avgObjSize" : 12608.630502865626, | |
| "dataSize" : 5044549152, | |
| "storageSize" : 6062137344, | |
| "numExtents" : 215, | |
| "indexes" : 34, | |
| "indexSize" : 27659408, | |
| "fileSize" : 6959398912, | |
| "nsSizeMB" : 16, | |
| "dataFileVersion" : { | |
| "major" : 4, | |
| "minor" : 5 | |
| }, | |
| "ok" : 1 | |
| } | |
| > db.repairDatabase(); | |
| { "ok" : 1 } | |
| > db.stats() | |
| { | |
| "db" : "sbtest", | |
| "collections" : 19, | |
| "objects" : 400087, | |
| "avgObjSize" : 12088.398953227674, | |
| "dataSize" : 4836411272, | |
| "storageSize" : 5714386944, | |
| "numExtents" : 212, | |
| "indexes" : 34, | |
| "indexSize" : 20423648, | |
| "fileSize" : 6959398912, | |
| "nsSizeMB" : 16, | |
| "dataFileVersion" : { | |
| "major" : 4, | |
| "minor" : 5 | |
| }, | |
| "ok" : 1 | |
| } | |
| > | |
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