Apsaradb for mongodb Oplog

Mongodb Replication stores write operations through a log, which is called Oplog. By default, for 64-bit mongodb, oplogs is quite large-it may be 5% of disk space. Generally, this is a reasonable setting. You can use mongod -- oplogSize to change the Log Size of the Oplog.

Mongodb RepliCatIon stores write operations through a log, which is called Oplog.

By default, for 64-bit mongodb, oplogs is quite large-it may be 5% of disk space. Generally, this is a reasonable setting. You can use mongod -- oplogSize to change the Log Size of the Oplog.

 

OplogColLectio:

Local. oplog. $ main for master/slave replication;

Local. oplog. rs for replicaSetS

For example, master/slave replication:

> Use local
SwitchEdTo db local
> Db. oplog. $ main. help ()
DBCollection help
Db. oplog. $ main.Find(). Help ()-show DBCursor help
Db. oplog. $ main. count ()
Db. oplog. $ main. dataSize ()
Db. oplog. $ main. distiNcT (key)-eg. db. oplog. $ main. distinct ('x ')
Db. oplog. $ main. drop () drop the collection
Db. oplog. $ main. dropIndEx(Name)
Db. oplog. $ main. dropIndexes ()
Db. oplog. $ main. enSuReIndex (keypattern, options)-options shocould be an object with these possible fields: name,UniqUe, dropDups
Db. oplog. $ main. reIndex ()
Db. oplog. $ main. find ([query], [fields])-first parameter is an optional query filter. second parameter is optional set of fields to return.
E.g. db. oplog. $ main. find ({x: 77}, {name: 1, x: 1 })
Db. oplog. $ main. find (...). count ()
Db. oplog. $ main. find (...). limit (n)
Db. oplog. $ main. find (...). skip (n)
Db. oplog. $ main. find (...).Sort(...)
Db. oplog. $ main. findOne ([query])
Db. oplog. $ main. findAndModify ({upDate:..., Remove: bool [, query :{}, sort :{}, 'new': faLsE]})
Db. oplog. $ main. getDB () get DB object associated with collection
Db. oplog. $ main. getIndexes ()
Db. oplog. $ main. group ({key:..., initial:..., reDuCe:... [, cond:...]})
Db. oplog. $ main. mapReduce (mapFunction, cecefunction, )
Db. oplog. $ main. remove (query)
Db. oplog. $ main. renameCollection (newName, ) Renames the collection.
Db. oplog. $ main. runCommand (name, ) Runs a db command with the given name where the first param is the collection name
Db. oplog. $ main. save (obj)
Db. oplog. $ main. StatS ()
Db. oplog. $ main. storageSize ()-Primary des FreeSpace al LocateD to this collection
Db. oplog. $ main. totalIndexSize ()-size in bytes of all the indexes
Db. oplog. $ main. totalSize ()-storage allocated for all data and indexes
Db. oplog. $ main. update (query, object [, upsert_bool, multi_bool])
Db. oplog. $ main. val IdAte ()-SLOW
Db. oplog. $ main. getShardVersion ()-only for use with sharding
> Db. oplog. $ main. find ()
{"Ts": {"t": 1294582140000, "I": 14}, "op": "d", "ns": "mixi_top_city.building_90", "B ": TrUe, "o": {"_ id": "6380690_441_30_29 "}}
{"Ts": {"t": 1294582140000, "I": 15}, "op": "I", "ns": "mixi_top_city.building_90", "o ": {"_ id": "6380690_441_24_24", "uid": "6380690", "x": 24, "y": 24, "pos": 1, "B Time": 1294154452," ntime ": 1294154452," bid ": 71," extprop ": 0," status ": 0," ucid ": 441 }}
{"Ts": {"t": 1294582140000, "I": 16}, "op": "u", "ns": "mixi_top_city.building_64", "o2 ": {"_ id": "16702364_459_14_14"}, "o": {"$ set": {"status": 1 }}}
{"Ts": {"t": 1294582140000, "I": 17}, "op": "u", "ns": "mixi_top_city.building_08", "o2 ": {"_ id": "6223408_391_30_28"}, "o": {"$ set": {"ntime": 1294582321 }}}
{"Ts": {"t": 1294582140000, "I": 18}, "op": "u", "ns": "mixi_top_city.building_03", "o2 ": {"_ id": "9882403_1__28_20"}, "o": {"$ set": {"ntime": 1294600141 }}}
{"Ts": {"t": 1294582140000, "I": 19}, "op": "u", "ns": "mixi_top_city.building_24", "o2 ": {"_ id": "4162924_365_32_28"}, "o": {"$ set": {"ntime": 1294582321 }}}
{"Ts": {"t": 1294582141000, "I": 1}, "op": "u", "ns": "mixi_top_city.building_49", "o2 ": {"_ id": "32797749_285_28_30"}, "o": {"$ set": {"ntime": 1294583341 }}}
{"Ts": {"t": 1294582141000, "I": 2}, "op": "u", "ns": "mixi_top_city.building_50", "o2 ": {"_ id": "33768850_1__28_32"}, "o": {"$ set": {"ntime": 1294582561 }}}
{"Ts": {"t": 1294582141000, "I": 3}, "op": "u", "ns": "mixi_top_city.building_35", "o2 ": {"_ id": "28235635_333_28_36"}, "o": {"$ set": {"ntime": 1294582741 }}}
{"Ts": {"t": 1294582141000, "I": 4}, "op": "u", "ns": "mixi_top_city.building_04", "o2 ": {"_ id": "25178304_3_32_28"}, "o": {"$ set": {"ntime": 1294594141 }}}
{"Ts": {"t": 1294582141000, "I": 5}, "op": "u", "ns": "mixi_top_city.building_18", "o2 ": {"_ id": "7301__445_32_26"}, "o": {"$ set": {"ntime": 1294582321 }}}
{"Ts": {"t": 1294582141000, "I": 6}, "op": "u", "ns": "mixi_top_city.building_93", "o2 ": {"_ id": "5003293_0000_20_24"}, "o": {"$ set": {"status": 1 }}}
{"Ts": {"t": 1294582141000, "I": 7}, "op": "u", "ns": "mixi_top_city.building_59", "o2 ": {"_ id": "19601459_485_28_30"}, "o": {"$ set": {"ntime": 1294582741 }}}
{"Ts": {"t": 1294582141000, "I": 8}, "op": "u", "ns": "mixi_top_city.building_47", "o2 ": {"_ id": "23744647_273_22_46"}, "o": {"$ set": {"ntime": 1294582741 }}}