db.event.stats()
{
	"ns" : "backend.event",
	"count" : 398469753,
	"size" : 159488786690,
	"avgObjSize" : 400,
	"storageSize" : 60577214464,
	"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.436962=(addr=\"01e3e03c3d81e46184c3e7e3e18aa782e420885085e3e03ffe81e44241ef42808080e50e1aaecfc0e50e8542afc0\",order=436962,time=1468218580,size=62365290496,write_gen=7052353)),checkpoint_lsn=(167196,33285888),checksum=on,collator=,columns=,dictionary=0,format=btree,huffman_key=,huffman_value=,id=52,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=64MB,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:backend/collection/49--8667964377448587020",
		"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" : 32271,
			"checkpoint size" : 62365290496,
			"allocations requiring file extension" : 3179,
			"blocks freed" : 22545,
			"file magic number" : 120897,
			"file major version number" : 1,
			"minor version number" : 0,
			"file bytes available for reuse" : 1699840,
			"file size in bytes" : 60577214464
		},
		"btree" : {
			"btree checkpoint generation" : 2719,
			"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" : 15,
			"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" : 67108864,
			"overflow pages" : 0,
			"row-store internal pages" : 0,
			"row-store leaf pages" : 0
		},
		"cache" : {
			"bytes read into cache" : 365651691352,
			"bytes written from cache" : 390950130,
			"checkpoint blocked page eviction" : 5,
			"unmodified pages evicted" : 10840056,
			"page split during eviction deepened the tree" : 0,
			"modified pages evicted" : 15828,
			"data source pages selected for eviction unable to be evicted" : 63236,
			"hazard pointer blocked page eviction" : 10504,
			"internal pages evicted" : 568014,
			"pages split during eviction" : 2153,
			"in-memory page splits" : 2,
			"overflow values cached in memory" : 0,
			"pages read into cache" : 11791723,
			"overflow pages read into cache" : 0,
			"pages written from cache" : 27641
		},
		"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" : 11212406,
			"compressed pages written" : 17875,
			"page written failed to compress" : 0,
			"page written was too small to compress" : 9766
		},
		"cursor" : {
			"create calls" : 4978,
			"insert calls" : 225968,
			"bulk-loaded cursor-insert calls" : 0,
			"cursor-insert key and value bytes inserted" : 88842739,
			"next calls" : 0,
			"prev calls" : 1,
			"remove calls" : 0,
			"cursor-remove key bytes removed" : 0,
			"reset calls" : 152568830,
			"search calls" : 153155887,
			"search near calls" : 0,
			"update calls" : 0,
			"cursor-update value bytes updated" : 0
		},
		"reconciliation" : {
			"dictionary matches" : 0,
			"internal page multi-block writes" : 489,
			"leaf page multi-block writes" : 2908,
			"maximum blocks required for a page" : 282,
			"internal-page overflow keys" : 0,
			"leaf-page overflow keys" : 0,
			"overflow values written" : 0,
			"pages deleted" : 0,
			"page checksum matches" : 54727,
			"page reconciliation calls" : 24705,
			"page reconciliation calls for eviction" : 15699,
			"leaf page key bytes discarded using prefix compression" : 0,
			"internal page key bytes discarded using suffix compression" : 57305
		},
		"session" : {
			"object compaction" : 0,
			"open cursor count" : 4978
		},
		"transaction" : {
			"update conflicts" : 0
		}
	},
	"nindexes" : 4,
	"totalIndexSize" : 39941500928,
	"indexSizes" : {
		"_id_" : 5698887680,
		"user_id_1_timestamp_1_event_type_1" : 12255432704,
		"group_id_1_timestamp_1_event_type_1" : 11282567168,
		"timestamp_1_event_type_1" : 10704613376
	},
	"ok" : 1
}