MongoDB 3.6之前oplog修改需要重启实例到非副本单实例模式，3.6开始可以使用命令replSetResizeOplog在线修改副本集成员的oplog大小。
修改方式为：先修改从secondary节点开，然后依次到主节点。
本文测试环境为MongoDB 4.2.5-5
1、MongoDB 3.6之前非在线修改步骤
查看oplog大小
db.getReplicationInfo()
rs.printReplicationInfo()
或
use local
db.oplog.rs.stats().maxSize
maxSize字段以字节为单位显示集合大小，可以看到当前节点oplog大小为maxSize kb/1024/1024=maxSize MB
说明：
计算机中的信息都是二进制的0和1来表示，其中每一个0或1被称作一个位，用小写b表示，即bit（位）
大写B表示byte,即字节，一个字节＝八个位，即1B＝8b
1MB=1024KB，1KB=1024Byte
关闭mongodb实例
db.shutdownServer()
以单节点模式（不包含 --replSet 参数）重新启动该 mongod 实例 。
命令如下：
mongod --port 29017 --dbpath /data/mongod27030/db
备份现有的Oplog（可选）
我们可以选择备份该节点现有的oplog来以防万一，命令如下：
mongodump --db local --collection 'oplog.rs' --port 29017
以新的大小重建oplog
保存oplog中最新的条目，以便副本方式启动后可以接上复制点位
例如，连接进入 mongo 窗口，并通过如下命令进入 local 数据库：
保存到rsOplogTemp
通过删除 rsOplogTemp表来确保其是空的：
use local
db.rsOplogTemp.drop()
使用 natural order 排序来找到oplog中最后一条数据，并通过 db.collection.save() 命令插入rsOplogTemp表中：
db.rsOplogTemp.save( db.oplog.rs.find( { }, { ts: 1, h: 1 } ).sort( {$natural : -1} ).limit(1).next() )
通过如下命令来查看oplog的保存结果：
db.rsOplogTemp.find()
删除已存在的Oplog
通过如下命令在 local 数据库中删除老的 oplog.rs 集合：
db = db.getSiblingDB('local')
db.oplog.rs.drop()
会返回 true
建立新的Oplog
通过 create 命令来建立新的oplog（新的大小）。 指定 size (单位为bytes)。下面的命令会建立一个 大小为 50 * 1024 * 1024 * 1024 也就是50G的oplog：
db.runCommand( { create: "oplog.rs", capped: true, size: (50* 1024 * 1024 * 1024) } )
成功后会返回如下内容：
{ "ok" : 1 }
将就备份Oplog的最后的条目插入新的Oplog中
将之前存好的老的oplog的最新的条目插入新的oplog中。例如：
db.oplog.rs.save( db.rsOplogTemp.findOne() )
通过如下命令来确认：
db.oplog.rs.find()
以复制集模式重启 mongod 实例
在所有从节点上重复该操作
最后再在主节点上进行该操作
把主变为从节点命令
rs.stepDown()
修改主节点的Oplog大小和
use local
db.rsOplogTemp.drop()
db.rsOplogTemp.save( db.oplog.rs.find( { }, { ts: 1, h: 1 } ).sort( {$natural : -1} ).limit(1).next() )
db.rsOplogTemp.find()
db.oplog.rs.drop()
db.oplog.rs.save( db.rsOplogTemp.findOne() )
db.oplog.rs.find()
2、MongoDB 3.6之后在线修改步骤
在线修改就简单多了，不用重启实例直接修改即可
同样先修改从再修改主节点
查看oplog大小
db.getReplicationInfo()
rs.printReplicationInfo()
或
use local
db.oplog.rs.stats().maxSize
在线设置oplog命令（修改为200G）
db.adminCommand({replSetResizeOplog: 1, size: (200* 1024 * 1024 * 1024)})
只列出修改主节点具体过程：
$ mongo.27030.login
Percona Server for MongoDB shell version v4.2.5-5
connecting to: mongodb://127.0.0.1:27030/admin?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("071767d1-48a1-4811-bd38-19ea91834275") }
Percona Server for MongoDB server version: v4.2.5-5
type "help" for help
Server has startup warnings:
2020-09-14T16:54:56.021+0800 I STORAGE [initandlisten]
2020-09-14T16:54:56.021+0800 I STORAGE [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2020-09-14T16:54:56.021+0800 I STORAGE [initandlisten] ** See http://dochub.mongodb.org/core/prodnotes-filesystem
pricing:PRIMARY> show dbs;
admin 0.000GB
config 0.016GB
db_hlf 0.000GB
insightToPricingTempDB 60.518GB
local 7.405GB
meb_backup 0.000GB
pricing 656.418GB
pricing:PRIMARY> use local
switched to db local
pricing:PRIMARY>
pricing:PRIMARY> show tables;
oplog.rs
replset.election
replset.minvalid
replset.oplogTruncateAfterPoint
startup_log
system.profile
system.replset
system.rollback.id
pricing:PRIMARY> db.getReplicationInfo()
{
"logSizeMB" : 40960,
"usedMB" : 40942.02,
"timeDiff" : 36757,
"timeDiffHours" : 10.21,
"tFirst" : "Wed Nov 02 2022 04:22:03 GMT+0800 (CST)",
"tLast" : "Wed Nov 02 2022 14:34:40 GMT+0800 (CST)",
"now" : "Wed Nov 02 2022 14:34:40 GMT+0800 (CST)"
}
pricing:PRIMARY>
pricing:PRIMARY>
pricing:PRIMARY> rs.printReplicationInfo()
configured oplog size: 40960MB
log length start to end: 36791secs (10.22hrs)
oplog first event time: Wed Nov 02 2022 04:22:03 GMT+0800 (CST)
oplog last event time: Wed Nov 02 2022 14:35:14 GMT+0800 (CST)
now: Wed Nov 02 2022 14:35:14 GMT+0800 (CST)
pricing:PRIMARY>
pricing:PRIMARY> db.oplog.rs.stats()
{
"ns" : "local.oplog.rs",
"size" : 42540148816,
"count" : 51569568,
"avgObjSize" : 824,
"storageSize" : 7950401536,
"capped" : true,
"max" : -1,
"maxSize" : NumberLong("42949672960"),
"sleepCount" : 0,
"sleepMS" : 0,
"wiredTiger" : {
"metadata" : {
"formatVersion" : 1,
"oplogKeyExtractionVersion" : 1
},
"creationString" : "access_pattern_hint=none,allocation_size=4KB,app_metadata=(formatVersion=1,oplogKeyExtractionVersion=1),assert=(commit_timestamp=none,durable_timestamp=none,read_timestamp=none),block_allocation=best,block_compressor=zlib,cache_resident=false,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=false,extractor=,format=btree,huffman_key=,huffman_value=,ignore_in_memory_cache_size=false,immutable=false,internal_item_max=0,internal_key_max=0,internal_key_truncate=true,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=true),lsm=(auto_throttle=true,bloom=true,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=false,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_custom=(prefix=,start_generation=0,suffix=),merge_max=15,merge_min=0),memory_page_image_max=0,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=false,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:local/collection-10-161348884478813828",
"LSM" : {
"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,
"bloom filters in the LSM tree" : 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 checkpoint throttle" : 0,
"sleep for LSM merge throttle" : 0,
"total size of bloom filters" : 0
},
"block-manager" : {
"allocations requiring file extension" : 3349112,
"blocks allocated" : 1352362833,
"blocks freed" : 1345571669,
"checkpoint size" : 7835570176,
"file allocation unit size" : 4096,
"file bytes available for reuse" : 114409472,
"file magic number" : 120897,
"file major version number" : 1,
"file size in bytes" : 7950401536,
"minor version number" : 0
},
"btree" : {
"btree checkpoint generation" : 928091,
"column-store fixed-size leaf pages" : 0,
"column-store internal pages" : 0,
"column-store variable-size RLE encoded values" : 0,
"column-store variable-size deleted values" : 0,
"column-store variable-size leaf pages" : 0,
"fixed-record size" : 0,
"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,
"maximum tree depth" : 5,
"number of key/value pairs" : 0,
"overflow pages" : 0,
"pages rewritten by compaction" : 0,
"row-store empty values" : 0,
"row-store internal pages" : 0,
"row-store leaf pages" : 0
},
"cache" : {
"bytes currently in the cache" : 39097477,
"bytes dirty in the cache cumulative" : NumberLong("3227120864196337"),
"bytes read into cache" : NumberLong("30649434970826"),
"bytes written from cache" : NumberLong("224393078444959"),
"checkpoint blocked page eviction" : 27826976,
"data source pages selected for eviction unable to be evicted" : 147137511,
"eviction walk passes of a file" : 125609432,
"eviction walk target pages histogram - 0-9" : 42799981,
"eviction walk target pages histogram - 10-31" : 56133966,
"eviction walk target pages histogram - 128 and higher" : 0,
"eviction walk target pages histogram - 32-63" : 8075032,
"eviction walk target pages histogram - 64-128" : 18600453,
"eviction walks abandoned" : 15063773,
"eviction walks gave up because they restarted their walk twice" : 18693145,
"eviction walks gave up because they saw too many pages and found no candidates" : 16532444,
"eviction walks gave up because they saw too many pages and found too few candidates" : 1782330,
"eviction walks reached end of tree" : 77160479,
"eviction walks started from root of tree" : 53810662,
"eviction walks started from saved location in tree" : 71798770,
"hazard pointer blocked page eviction" : 101789687,
"in-memory page passed criteria to be split" : 143730001,
"in-memory page splits" : 27435891,
"internal pages evicted" : 24318895,
"internal pages split during eviction" : 117395,
"leaf pages split during eviction" : 29879780,
"modified pages evicted" : 1756301835,
"overflow pages read into cache" : 0,
"page split during eviction deepened the tree" : 2,
"page written requiring cache overflow records" : 6411919,
"pages read into cache" : 37786688,
"pages read into cache after truncate" : 6,
"pages read into cache after truncate in prepare state" : 0,
"pages read into cache requiring cache overflow entries" : 4430210,
"pages requested from the cache" : 852708978123,
"pages seen by eviction walk" : 13053020461,
"pages written from cache" : 1350505636,
"pages written requiring in-memory restoration" : 1643469608,
"tracked dirty bytes in the cache" : 16868908,
"unmodified pages evicted" : 520958986
},
"cache_walk" : {
"Average difference between current eviction generation when the page was last considered" : 0,
"Average on-disk page image size seen" : 0,
"Average time in cache for pages that have been visited by the eviction server" : 0,
"Average time in cache for pages that have not been visited by the eviction server" : 0,
"Clean pages currently in cache" : 0,
"Current eviction generation" : 0,
"Dirty pages currently in cache" : 0,
"Entries in the root page" : 0,
"Internal pages currently in cache" : 0,
"Leaf pages currently in cache" : 0,
"Maximum difference between current eviction generation when the page was last considered" : 0,
"Maximum page size seen" : 0,
"Minimum on-disk page image size seen" : 0,
"Number of pages never visited by eviction server" : 0,
"On-disk page image sizes smaller than a single allocation unit" : 0,
"Pages created in memory and never written" : 0,
"Pages currently queued for eviction" : 0,
"Pages that could not be queued for eviction" : 0,
"Refs skipped during cache traversal" : 0,
"Size of the root page" : 0,
"Total number of pages currently in cache" : 0
},
"compression" : {
"compressed page maximum internal page size prior to compression" : 4096,
"compressed page maximum leaf page size prior to compression " : 131072,
"compressed pages read" : 19334567,
"compressed pages written" : 1292203047,
"page written failed to compress" : 15,
"page written was too small to compress" : 58284301
},
"cursor" : {
"bulk loaded cursor insert calls" : 0,
"cache cursors reuse count" : 161218247576,
"close calls that result in cache" : 0,
"create calls" : 8540658,
"insert calls" : 93786543065,
"insert key and value bytes" : NumberLong("217477902319400"),
"modify" : 0,
"modify key and value bytes affected" : 0,
"modify value bytes modified" : 0,
"next calls" : 383465738645,
"open cursor count" : 0,
"operation restarted" : 125673801,
"prev calls" : 2424332,
"remove calls" : 0,
"remove key bytes removed" : 0,
"reserve calls" : 0,
"reset calls" : 453145034066,
"search calls" : 201387099129,
"search near calls" : 48617868,
"truncate calls" : 606206,
"update calls" : 0,
"update key and value bytes" : 0,
"update value size change" : 0
},
"reconciliation" : {
"dictionary matches" : 0,
"fast-path pages deleted" : 1305741465,
"internal page key bytes discarded using suffix compression" : 2510526175,
"internal page multi-block writes" : 2247001,
"internal-page overflow keys" : 0,
"leaf page key bytes discarded using prefix compression" : 0,
"leaf page multi-block writes" : 30862966,
"leaf-page overflow keys" : 0,
"maximum blocks required for a page" : 248,
"overflow values written" : 0,
"page checksum matches" : 62730811,
"page reconciliation calls" : 1826026066,
"page reconciliation calls for eviction" : 1744888010,
"pages deleted" : 50258568
},
"session" : {
"object compaction" : 0
},
"transaction" : {
"update conflicts" : 0
}
},
"nindexes" : 0,
"indexBuilds" : [ ],
"totalIndexSize" : 0,
"indexSizes" : {
},
"scaleFactor" : 1,
"ok" : 1
}
pricing:PRIMARY> db.oplog.rs.stats().size
42639175559
pricing:PRIMARY>
pricing:PRIMARY>
pricing:PRIMARY> db.oplog.rs.stats().maxSize
NumberLong("42949672960")
pricing:PRIMARY>
正式执行在线修改oplog命令
pricing:PRIMARY> db.adminCommand({replSetResizeOplog:1,size:200000})
{ "ok" : 1 }
pricing:PRIMARY> db.getReplicationInfo()
{
"logSizeMB" : 200000,
"usedMB" : 40762.12,
"timeDiff" : 36973,
"timeDiffHours" : 10.27,
"tFirst" : "Wed Nov 02 2022 04:35:56 GMT+0800 (CST)",
"tLast" : "Wed Nov 02 2022 14:52:09 GMT+0800 (CST)",
"now" : "Wed Nov 02 2022 14:52:09 GMT+0800 (CST)"
}
pricing:PRIMARY>
pricing:PRIMARY> rs.printReplicationInfo()
configured oplog size: 200000MB
log length start to end: 37013secs (10.28hrs)
oplog first event time: Wed Nov 02 2022 04:35:56 GMT+0800 (CST)
oplog last event time: Wed Nov 02 2022 14:52:49 GMT+0800 (CST)
now: Wed Nov 02 2022 14:52:49 GMT+0800 (CST)
pricing:PRIMARY>
pricing:PRIMARY> db.oplog.rs.stats()
{
"ns" : "local.oplog.rs",
"size" : 42797529322,
"count" : 51864026,
"avgObjSize" : 825,
"storageSize" : 7950401536,
"capped" : true,
"max" : -1,
"maxSize" : NumberLong("209715200000"),
"sleepCount" : 0,
"sleepMS" : 0,
"wiredTiger" : {
"metadata" : {
"formatVersion" : 1,
"oplogKeyExtractionVersion" : 1
},
"creationString" : "access_pattern_hint=none,allocation_size=4KB,app_metadata=(formatVersion=1,oplogKeyExtractionVersion=1),assert=(commit_timestamp=none,durable_timestamp=none,read_timestamp=none),block_allocation=best,block_compressor=zlib,cache_resident=false,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=false,extractor=,format=btree,huffman_key=,huffman_value=,ignore_in_memory_cache_size=false,immutable=false,internal_item_max=0,internal_key_max=0,internal_key_truncate=true,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=true),lsm=(auto_throttle=true,bloom=true,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=false,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_custom=(prefix=,start_generation=0,suffix=),merge_max=15,merge_min=0),memory_page_image_max=0,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=false,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:local/collection-10-161348884478813828",
"LSM" : {
"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,
"bloom filters in the LSM tree" : 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 checkpoint throttle" : 0,
"sleep for LSM merge throttle" : 0,
"total size of bloom filters" : 0
},
"block-manager" : {
"allocations requiring file extension" : 3349112,
"blocks allocated" : 1352369190,
"blocks freed" : 1345575514,
"checkpoint size" : 7871774720,
"file allocation unit size" : 4096,
"file bytes available for reuse" : 77344768,
"file magic number" : 120897,
"file major version number" : 1,
"file size in bytes" : 7950401536,
"minor version number" : 0
},
"btree" : {
"btree checkpoint generation" : 928106,
"column-store fixed-size leaf pages" : 0,
"column-store internal pages" : 0,
"column-store variable-size RLE encoded values" : 0,
"column-store variable-size deleted values" : 0,
"column-store variable-size leaf pages" : 0,
"fixed-record size" : 0,
"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,
"maximum tree depth" : 5,
"number of key/value pairs" : 0,
"overflow pages" : 0,
"pages rewritten by compaction" : 0,
"row-store empty values" : 0,
"row-store internal pages" : 0,
"row-store leaf pages" : 0
},
"cache" : {
"bytes currently in the cache" : 32983398,
"bytes dirty in the cache cumulative" : NumberLong("3227121205452138"),
"bytes read into cache" : NumberLong("30649436494315"),
"bytes written from cache" : NumberLong("224393784183736"),
"checkpoint blocked page eviction" : 27826976,
"data source pages selected for eviction unable to be evicted" : 147138809,
"eviction walk passes of a file" : 125612403,
"eviction walk target pages histogram - 0-9" : 42802670,
"eviction walk target pages histogram - 10-31" : 56134248,
"eviction walk target pages histogram - 128 and higher" : 0,
"eviction walk target pages histogram - 32-63" : 8075032,
"eviction walk target pages histogram - 64-128" : 18600453,
"eviction walks abandoned" : 15063805,
"eviction walks gave up because they restarted their walk twice" : 18695809,
"eviction walks gave up because they saw too many pages and found no candidates" : 16532476,
"eviction walks gave up because they saw too many pages and found too few candidates" : 1782334,
"eviction walks reached end of tree" : 77165926,
"eviction walks started from root of tree" : 53813399,
"eviction walks started from saved location in tree" : 71799004,
"hazard pointer blocked page eviction" : 101789981,
"in-memory page passed criteria to be split" : 143730168,
"in-memory page splits" : 27435974,
"internal pages evicted" : 24319050,
"internal pages split during eviction" : 117396,
"leaf pages split during eviction" : 29879875,
"modified pages evicted" : 1756302206,
"overflow pages read into cache" : 0,
"page split during eviction deepened the tree" : 2,
"page written requiring cache overflow records" : 6411919,
"pages read into cache" : 37786766,
"pages read into cache after truncate" : 6,
"pages read into cache after truncate in prepare state" : 0,
"pages read into cache requiring cache overflow entries" : 4430210,
"pages requested from the cache" : 852715516011,
"pages seen by eviction walk" : 13053049871,
"pages written from cache" : 1350511963,
"pages written requiring in-memory restoration" : 1643469619,
"tracked dirty bytes in the cache" : 10754938,
"unmodified pages evicted" : 520960849
},
"cache_walk" : {
"Average difference between current eviction generation when the page was last considered" : 0,
"Average on-disk page image size seen" : 0,
"Average time in cache for pages that have been visited by the eviction server" : 0,
"Average time in cache for pages that have not been visited by the eviction server" : 0,
"Clean pages currently in cache" : 0,
"Current eviction generation" : 0,
"Dirty pages currently in cache" : 0,
"Entries in the root page" : 0,
"Internal pages currently in cache" : 0,
"Leaf pages currently in cache" : 0,
"Maximum difference between current eviction generation when the page was last considered" : 0,
"Maximum page size seen" : 0,
"Minimum on-disk page image size seen" : 0,
"Number of pages never visited by eviction server" : 0,
"On-disk page image sizes smaller than a single allocation unit" : 0,
"Pages created in memory and never written" : 0,
"Pages currently queued for eviction" : 0,
"Pages that could not be queued for eviction" : 0,
"Refs skipped during cache traversal" : 0,
"Size of the root page" : 0,
"Total number of pages currently in cache" : 0
},
"compression" : {
"compressed page maximum internal page size prior to compression" : 4096,
"compressed page maximum leaf page size prior to compression " : 131072,
"compressed pages read" : 19334588,
"compressed pages written" : 1292209163,
"page written failed to compress" : 15,
"page written was too small to compress" : 58284512
},
"cursor" : {
"bulk loaded cursor insert calls" : 0,
"cache cursors reuse count" : 161219534286,
"close calls that result in cache" : 0,
"create calls" : 8540692,
"insert calls" : 93787274704,
"insert key and value bytes" : NumberLong("217478595773904"),
"modify" : 0,
"modify key and value bytes affected" : 0,
"modify value bytes modified" : 0,
"next calls" : 383467917404,
"open cursor count" : 0,
"operation restarted" : 125674078,
"prev calls" : 2424372,
"remove calls" : 0,
"remove key bytes removed" : 0,
"reserve calls" : 0,
"reset calls" : 453148494366,
"search calls" : 201388546170,
"search near calls" : 48617880,
"truncate calls" : 606207,
"update calls" : 0,
"update key and value bytes" : 0,
"update value size change" : 0
},
"reconciliation" : {
"dictionary matches" : 0,
"fast-path pages deleted" : 1305745172,
"internal page key bytes discarded using suffix compression" : 2510539166,
"internal page multi-block writes" : 2247031,
"internal-page overflow keys" : 0,
"leaf page key bytes discarded using prefix compression" : 0,
"leaf page multi-block writes" : 30863075,
"leaf-page overflow keys" : 0,
"maximum blocks required for a page" : 248,
"overflow values written" : 0,
"page checksum matches" : 62731972,
"page reconciliation calls" : 1826026650,
"page reconciliation calls for eviction" : 1744888215,
"pages deleted" : 50258759
},
"session" : {
"object compaction" : 0
},
"transaction" : {
"update conflicts" : 0
}
},
"nindexes" : 0,
"indexBuilds" : [ ],
"totalIndexSize" : 0,
"indexSizes" : {
},
"scaleFactor" : 1,
"ok" : 1
}
pricing:PRIMARY>
pricing:PRIMARY> db.oplog.rs.stats().size
42800956946
pricing:PRIMARY>
pricing:PRIMARY> db.oplog.rs.stats().maxSize
NumberLong("209715200000")
pricing:PRIMARY> exit
bye