mongodb - 查看集合的状态

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#查看集合postalCodes的状态信息 > db.postalCodes.stats(1024)  #1024表示显示的单位是KB。默认是bytes {         "ns" : "test.postalCodes",      #格式是：数据库名.集合名         "count" : 39734,                #集合中的文档数         "size" : 5259,                  #集合占用的实际存储大小         "avgObjSize" : 135,             #集合中文档的平均大小         "storageSize" : 1596,           #为集合预分配的存储大小，一般比size大         "capped" : false,         "wiredTiger" : {                 "metadata" : {                         "formatVersion" : 1                 },                 "creationString" : "allocation_size=4KB,app_metadata=(formatVersion=1),block_allocation=best,block_compressor=snappy,cache_resident=0,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=0,extractor=,format=btree,huffman_key=,huffman_value=,immutable=0,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,log=(enabled=),lsm=(auto_throttle=,bloom=,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=0,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_max=15,merge_min=0),memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=0,prefix_compression_min=4,source=,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,type=file,value_format=u",                 "type" : "file",                 "uri" : "statistics:table:collection-8--2968979914760233772",                 "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" : 200,                         "checkpoint size" : 1626112,                         "allocations requiring file extension" : 200,                         "blocks freed" : 0,                         "file magic number" : 120897,                         "file major version number" : 1,                         "minor version number" : 0,                         "file bytes available for reuse" : 0,                         "file size in bytes" : 1634304                 },                 "btree" : {                         "btree checkpoint generation" : 60,                         "column-store variable-size deleted values" : 0,                         "column-store fixed-size leaf pages" : 0,                         "column-store internal pages" : 0,                         "column-store variable-size RLE encoded values" : 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" : 3,                         "maximum internal page key size" : 368,                         "maximum internal page size" : 4096,                         "maximum leaf page key size" : 2867,                         "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" : 0,                         "bytes written from cache" : 5660778,                         "checkpoint blocked page eviction" : 0,                         "unmodified pages evicted" : 0,                         "page split during eviction deepened the tree" : 0,                         "modified pages evicted" : 0,                         "data source pages selected for eviction unable to be evicted" : 0,                         "hazard pointer blocked page eviction" : 0,                         "internal pages evicted" : 0,                         "internal pages split during eviction" : 0,                         "leaf pages split during eviction" : 0,                         "in-memory page splits" : 0,                         "in-memory page passed criteria to be split" : 0,                         "overflow values cached in memory" : 0,                         "pages read into cache" : 0,                         "pages read into cache requiring lookaside entries" : 0,                         "overflow pages read into cache" : 0,                         "pages written from cache" : 199,                         "page written requiring lookaside records" : 0,                         "pages written requiring in-memory restoration" : 0                 },                 "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" : 0,                         "compressed pages written" : 198,                         "page written failed to compress" : 0,                         "page written was too small to compress" : 1                 },                 "cursor" : {                         "create calls" : 2,                         "insert calls" : 39734,                         "bulk-loaded cursor-insert calls" : 0,                         "cursor-insert key and value bytes inserted" : 5495945,                         "next calls" : 79471,                         "prev calls" : 1,                         "remove calls" : 0,                         "cursor-remove key bytes removed" : 0,                         "reset calls" : 40358,                         "restarted searches" : 0,                         "search calls" : 0,                         "search near calls" : 620,                         "truncate calls" : 0,                         "update calls" : 0,                         "cursor-update value bytes updated" : 0                 },                 "reconciliation" : {                         "dictionary matches" : 0,                         "internal page multi-block writes" : 0,                         "leaf page multi-block writes" : 1,                         "maximum blocks required for a page" : 198,                         "internal-page overflow keys" : 0,                         "leaf-page overflow keys" : 0,                         "overflow values written" : 0,                         "pages deleted" : 0,                         "fast-path pages deleted" : 0,                         "page checksum matches" : 0,                         "page reconciliation calls" : 2,                         "page reconciliation calls for eviction" : 0,                         "leaf page key bytes discarded using prefix compression" : 0,                         "internal page key bytes discarded using suffix compression" : 199                 },                 "session" : {                         "object compaction" : 0,                         "open cursor count" : 2                 },                 "transaction" : {                         "update conflicts" : 0                 }         },         "nindexes" : 3,             #集合上的索引数         "totalIndexSize" : 820,         "indexSizes" : {                 "_id_" : 324,                 "pincode_1" : 176,                 "Pincode_1" : 320         },         "ok" : 1 } >