mongos> db.collection.stats() { "sharded" : true, "capped" : false, "ns" : "database.collection", "count" : 147086349, "size" : 19116749887, "storageSize" : 7625519104, "totalIndexSize" : 18797576192, "indexSizes" : { "_id_" : 2437955584, "u_1_s_1" : 4279308288, "u_1_valueX_-1" : 3013767168, "u_1_valueY_-1" : 3025604608, "u_1_valueZ_-1" : 3003850752, "u_1_value_-1" : 3037089792 }, "avgObjSize" : 129.96957241082924, "nindexes" : 6, "nchunks" : 1087, "shards" : { "rs01" : { "ns" : "database.collection", "count" : 30734858, "size" : 3904205011, "avgObjSize" : 127, "storageSize" : 1467019264, "capped" : false, "wiredTiger" : { "metadata" : { "formatVersion" : 1 }, "creationString" : "allocation_size=4KB,app_metadata=(formatVersion=1),block_allocation=best,block_compressor=snappy,cache_resident=0,checkpoint=(WiredTigerCheckpoint.9755=(addr=\"01e2038981e48ea6e8f0e2d26f93e443e3676ce2a7f590e462b5eb16808080e45770cfc0e4556a9fc0\",order=9755,time=1430118846,size=1433059328,write_gen=9812331)),checkpoint_lsn=(19045,55226368),checksum=uncompressed,collator=,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=3746,internal_item_max=0,internal_key_max=0,internal_key_truncate=,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=1MB,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=0,prefix_compression_min=4,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,value_format=u,version=(major=1,minor=1)", "type" : "file", "uri" : "statistics:table:collection-1456-720666989835914263", "LSM" : { "bloom filters in the LSM tree" : 0, "bloom filter false positives" : 0, "bloom filter hits" : 0, "bloom filter misses" : 0, "bloom filter pages evicted from cache" : 0, "bloom filter pages read into cache" : 0, "total size of bloom filters" : 0, "sleep for LSM checkpoint throttle" : 0, "chunks in the LSM tree" : 0, "highest merge generation in the LSM tree" : 0, "queries that could have benefited from a Bloom filter that did not exist" : 0, "sleep for LSM merge throttle" : 0 }, "block-manager" : { "file allocation unit size" : 4096, "blocks allocated" : 8843610, "checkpoint size" : 1433059328, "allocations requiring file extension" : 652202, "blocks freed" : 9237577, "file magic number" : 120897, "file major version number" : 1, "minor version number" : 0, "file bytes available for reuse" : 73654272, "file size in bytes" : 1467019264 }, "btree" : { "btree checkpoint generation" : 21988, "column-store variable-size deleted values" : 0, "column-store fixed-size leaf pages" : 0, "column-store internal pages" : 0, "column-store variable-size leaf pages" : 0, "pages rewritten by compaction" : 0, "number of key/value pairs" : 0, "fixed-record size" : 0, "maximum tree depth" : 8, "maximum internal page key size" : 368, "maximum internal page size" : 4096, "maximum leaf page key size" : 3276, "maximum leaf page size" : 32768, "maximum leaf page value size" : 1048576, "overflow pages" : 0, "row-store internal pages" : 0, "row-store leaf pages" : 0 }, "cache" : { "bytes read into cache" : 133082650117, "bytes written from cache" : 214603379727, "checkpoint blocked page eviction" : 3610, "unmodified pages evicted" : 690487, "page split during eviction deepened the tree" : 0, "modified pages evicted" : 3517273, "data source pages selected for eviction unable to be evicted" : 45717, "hazard pointer blocked page eviction" : 9826, "internal pages evicted" : 61421, "pages split during eviction" : 7848, "in-memory page splits" : 2720, "overflow values cached in memory" : 0, "pages read into cache" : 4330752, "overflow pages read into cache" : 0, "pages 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"internal-page overflow keys" : 0, "leaf-page overflow keys" : 0, "overflow values written" : 0, "pages deleted" : 1056478, "page checksum matches" : 3733276, "page reconciliation calls" : 7569418, "page reconciliation calls for eviction" : 710889, "leaf page key bytes discarded using prefix compression" : 0, "internal page key bytes discarded using suffix compression" : 704584 }, "session" : { "object compaction" : 0, "open cursor count" : 482 }, "transaction" : { "update conflicts" : 246294 } }, "nindexes" : 6, "totalIndexSize" : 3736555520, "indexSizes" : { "_id_" : 516521984, "u_1_s_1" : 822104064, "u_1_valueX_-1" : 584278016, "u_1_valueY_-1" : 608284672, "u_1_value_-1" : 598315008, "u_1_valueZ_-1" : 607051776 }, "ok" : 1, "$gleStats" : { "lastOpTime" : Timestamp(0, 0), "electionId" : ObjectId("55278c4340f5f9026bd1a028") } }, "rs02" : { "ns" : "database.collection", "count" : 28925930, "size" : 3781169607, "avgObjSize" : 130, "storageSize" : 1511247872, "capped" : false, "wiredTiger" : { "metadata" : { "formatVersion" : 1 }, "creationString" : "allocation_size=4KB,app_metadata=(formatVersion=1),block_allocation=best,block_compressor=snappy,cache_resident=0,checkpoint=(WiredTigerCheckpoint.9161=(addr=\"01c0ba81e49c2e5cece247c48fe4ae518044e261b98de44024698f808080e45a13afc0e457ac4fc0\",order=9161,time=1430118885,size=1470918656,write_gen=3271402)),checkpoint_lsn=(5356,51908352),checksum=uncompressed,collator=,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=806,internal_item_max=0,internal_key_max=0,internal_key_truncate=,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=1MB,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=0,prefix_compression_min=4,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,value_format=u,version=(major=1,minor=1)", "type" : "file", "uri" : "statistics:table:collection-22--6591887162067735865", "LSM" : { "bloom 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internal pages" : 0, "column-store variable-size leaf pages" : 0, "pages rewritten by compaction" : 0, "number of key/value pairs" : 0, "fixed-record size" : 0, "maximum tree depth" : 5, "maximum internal page key size" : 368, "maximum internal page size" : 4096, "maximum leaf page key size" : 3276, "maximum leaf page size" : 32768, "maximum leaf page value size" : 1048576, "overflow pages" : 0, "row-store internal pages" : 0, "row-store leaf pages" : 0 }, "cache" : { "bytes read into cache" : 37132208679, "bytes written from cache" : 74991067691, "checkpoint blocked page eviction" : 0, "unmodified pages evicted" : 119172, "page split during eviction deepened the tree" : 0, "modified pages evicted" : 919523, "data source pages selected for eviction unable to be evicted" : 14486, "hazard pointer blocked page eviction" : 1529, "internal pages evicted" : 12752, "pages split during eviction" : 671, "in-memory page splits" : 9, "overflow values cached in memory" : 0, "pages read into cache" : 1153931, "overflow pages read into cache" : 0, "pages written from cache" : 2557829 }, "compression" : { "raw compression call failed, no additional data available" : 0, "raw compression call failed, additional data available" : 0, "raw compression call succeeded" : 0, "compressed pages read" : 1137002, "compressed pages written" : 2268716, "page written failed to compress" : 0, "page written was too small to compress" : 289113 }, "cursor" : { "create calls" : 145, "insert calls" : 453134759, "bulk-loaded cursor-insert calls" : 0, "cursor-insert key and value bytes inserted" : 59788675199, "next calls" : 1031952186, "prev calls" : 0, "remove calls" : 6743, "cursor-remove key bytes removed" : 33715, "reset calls" : 923229362, "search calls" : 460888147, "search near calls" : 461131589, "update calls" : 0, "cursor-update value bytes updated" : 0 }, "reconciliation" : { "dictionary matches" : 0, "internal page multi-block writes" : 3069, "leaf page multi-block writes" : 4845, "maximum blocks required for a page" : 69, "internal-page overflow keys" : 0, "leaf-page overflow keys" : 0, "overflow values written" : 0, "pages deleted" : 0, "page checksum matches" : 169506, "page reconciliation calls" : 2537392, "page reconciliation calls for eviction" : 177243, "leaf page key bytes discarded using prefix compression" : 0, "internal page key bytes discarded using suffix compression" : 174165 }, "session" : { "object compaction" : 0, "open cursor count" : 145 }, "transaction" : { "update conflicts" : 25284 } }, "nindexes" : 6, "totalIndexSize" : 3729330176, "indexSizes" : { "_id_" : 460369920, "u_1_s_1" : 866312192, "u_1_valueX_-1" : 601505792, "u_1_valueY_-1" : 592424960, "u_1_value_-1" : 606633984, "u_1_valueZ_-1" : 602083328 }, "ok" : 1, "$gleStats" : { "lastOpTime" : Timestamp(1428998183, 1), "electionId" : ObjectId("5527a7aa97863052c9d10c85") } }, "rs03" : { "ns" : "database.collection ", "count" : 29235321, "size" : 3817865880, "avgObjSize" : 130, "storageSize" : 1571135488, "capped" : false, "wiredTiger" : { "metadata" : { "formatVersion" : 1 }, "creationString" : "allocation_size=4KB,app_metadata=(formatVersion=1),block_allocation=best,block_compressor=snappy,cache_resident=0,checkpoint=(WiredTigerCheckpoint.9091=(addr=\"01e219fa81e474535aeae21b8993e46b7277e4e21b9c90e4844046c3808080e45da57fc0e45803efc0\",order=9091,time=1430118851,size=1476661248,write_gen=3740757)),checkpoint_lsn=(4113,3480960),checksum=uncompressed,collator=,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=801,internal_item_max=0,internal_key_max=0,internal_key_truncate=,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=1MB,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=0,prefix_compression_min=4,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,value_format=u,version=(major=1,minor=1)", "type" : "file", "uri" : 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: 29226593, "size" : 3815053225, "avgObjSize" : 130, "storageSize" : 1559113728, "capped" : false, "wiredTiger" : { "metadata" : { "formatVersion" : 1 }, "creationString" : "allocation_size=4KB,app_metadata=(formatVersion=1),block_allocation=best,block_compressor=snappy,cache_resident=0,checkpoint=(WiredTigerCheckpoint.9159=(addr=\"01e203a981e4fca4d9a9e207f290e4067d0fa0e206858de4e35cdfe0808080e45cee0fc0e458902fc0\",order=9159,time=1430118904,size=1485852672,write_gen=4410235)),checkpoint_lsn=(4017,61531392),checksum=uncompressed,collator=,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=783,internal_item_max=0,internal_key_max=0,internal_key_truncate=,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=1MB,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=0,prefix_compression_min=4,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,value_format=u,version=(major=1,minor=1)", 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