How could i query operation log (Oplog) in MongoDB?
2014年9月6日 · If you want to query by date, you need to generate a proper MongoDB timestamp. You can use the Date class for that purpose. If you want for example to count the amount of entries between two dates, you can try a query similar to this one:
Modify and replay MongoDB oplog - Stack Overflow
2013年3月16日 · Is it possible to modify the MongoDB oplog and replay it? A bug caused an update to be applied to more documents than it was supposed to be, overwriting some data. Data was recovered from backup and reintegrated, so nothing was actually lost, but I was wondering if there was a way to modify the oplog to remove or modify the offending update and ...
mongodb - What do the oplog fields actually mean? - Stack …
The SO link has correct, AFAIK, descriptions. It's intentional that the format of the oplog is undocumented because it's meant as an implementation detail and MongoDB wants to reserve the ability to adjust or totally change the oplog mechanism. Documenting it creates expectations, intentionally or not. –
How do the MongoDB journal file and oplog differ?
2014年6月20日 · Oplog is just capped collection where MongoDB tracks all changes in its collections (insert, update, delete). It doesn't track read operations. MongoDB uses oplog to spread all changes within all nodes in a replica set. Secondary nodes copy and apply this changes. Journal is a feature of underlying storage engine.
How to see oplog in standalone MongoDB - Stack Overflow
2014年3月6日 · I want to see oplog so I have started MongoDB with as suggested in here mongod --master --port 8888 --dbpath ...
What do MongoDB oplog operations letters mean? - Stack Overflow
2014年5月17日 · For most oplog tailing applications, you will only be interested in these three values, but there is also a “c” for commands that affect databases at a high level, “db” which apparently announces the presence of a “database”, and “n” for “no-ops”, used for changes in the database or collections which don’t result in a ...
mongodb - oplog enable on standalone mongod not for …
2013年12月10日 · For mongo 2.6 or greater the /etc/mongod.conf now uses a yaml format. To enable the oplog add something similar to the below, note the replication: line may already exist, be sure to use spaces.
MongoDB enable oplog windows - Stack Overflow
2020年1月10日 · Try to enable oplog locally Add to C:\Program Files\MongoDB\Server\4.2\bin\mongod.cfg replication: replSetName: rs0 oplogSizeMB: 100 Restart mongod, but local.oplog does not exist How corre...
How to listen for changes to a MongoDB collection?
MongoDB does not have any support for triggers, however some people have "rolled their own" using some tricks. The key here is the oplog. When you run MongoDB in a Replica Set, all of the MongoDB actions are logged to an operations log (known as the oplog). The oplog is basically just a running list of the modifications made to the data.
MongoDB replica set OpLog Gb/Hour increasing rapidly, trying to …
2015年4月24日 · MongoDB (v 2.6.6) three node replica set OpLog Gb/Hour increasing rapidly over the course of several days having been at 20mb per hour for months. I am attempting to isolate why. In understand Oplog.rs is a Capped Collection and this is related to increase transaction volumes but I finding it difficult to isolate the cause of the increase ...