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How do I downgrade MongoDB?
Downgrade each secondary member of the replica set, one at a time:
- Shut down the mongod . See Stop mongod Processes for instructions on safely terminating mongod processes.
- Replace the 4.0 binary with the 3.6 binary and restart.
- Wait for the member to recover to SECONDARY state before downgrading the next secondary.
What is the latest version of MongoDB?
MongoDB 5.0
The latest Major Release of the database is MongoDB 5.0….What’s New in the Latest MongoDB Versions
- 2020 — MongoDB 4.4.
- 2019 — MongoDB 4.2.
- 2018 — MongoDB 4.0.
- 2017 — MongoDB 3.6.
- 2016 — MongoDB 3.4.
- 2015 (Late) — MongoDB 3.2.
- 2015 (Early) — MongoDB 3.0.
- 2014 — MongoDB 2.6.
Can we change _ID in MongoDB?
Finally, keep in mind that the _id field is immutable — that is, once a document exists in your MongoDB system, it has, by definition, been assigned an _id, and you cannot change its primary key. That said, _id can be overridden when you insert new documents, but by default it will be populated with an ObjectID.
Where is MongoDB installed?
Install MongoDB On Windows Now install the downloaded file, by default, it will be installed in the folder C:\Program Files\. MongoDB requires a data folder to store its files. The default location for the MongoDB data directory is c:\data\db. So you need to create this folder using the Command Prompt.
Can you upgrade MongoDB from 4.0 to 4.2?
To upgrade an existing MongoDB deployment to 4.2, you must be running a 4.0-series release. To upgrade from a version earlier than the 4.0-series, you must successively upgrade major releases until you have upgraded to 4.0-series. For example, if you are running a 3.6-series, you must upgrade first to 4.0 before you can upgrade to 4.2.
How to upgrade a replica set in MongoDB?
To upgrade a replica set, upgrade each member individually, starting with the secondaries and finishing with the primary. Plan the upgrade during a predefined maintenance window. Starting in MongoDB 4.0.7, change streams use a version 1 v1 resume tokens. MongoDB versions earlier than 4.0.7 use v0 resume tokens or BinData resume tokens.
When to upgrade a shard in MongoDB?
If a shard is a replica set, upgrade the shard using the procedure titled Upgrade Replica Sets. If a shard is a standalone instance, upgrade the shard using the procedure titled Upgrade a MongoDB Instance.
What do you need to know about MongoDB 3.6?
Starting in MongoDB 3.6, MongoDB enables support for “majority” read concern by default. You can disable read concern “majority” to prevent the storage cache pressure from immobilizing a deployment with a primary-secondary-arbiter (PSA) architecture.