Repairing the MongoDB Database
This tutorial discusses repairing database using MongoDB in Windows OS according to the problem we face.
Repairing a Database in MongoDB
There are different scenarios where we need to repair a database using MongoDB. For example, we repair a database if there was an improper or unclean shutdown or if we want to check for inconsistencies and errors.
We will also repair the database if the system is shut down unexpectedly. Before going into the repair process, let us understand the components of a MongoDB database.
MongoDB database components
The MongoDB database has three components , which are briefly described below.
Here are some problems and their solutions.
Problem 1: The system shuts down unexpectedly
Here is a step-by-step solution to this problem. Before you follow these steps, remember that there is a folder in rootthe directory .data
Issue 2: Fix MongoDB improper shutdown
If an unclean shutdown occurs while working in MongoDB and journaling is disabled, the data may be inconsistent. If there is a non-empty mongod.lockfile, we will face the following error message.
error message:
Detected unclean shutdown – mongod.lock is not empty
The solution to this particular problem is given below.
C:\> mongod --dbpath /data/db --repair
Once completed, MongoDB will be repaired.
Problem 3: Connect Failed Unclean Shutdown Detected
If any of us faces the following error, we have to follow a two-step process.
error message:
couldn't connect to server 127.0.0.1 shell/mongo.js:8 4 exceptions: connect failed Unclean shutdown detected
Step 1: Open Windows Command Prompt and type cd/Change directory to root.
Step 2: Execute the following command, press Enterand wait for it to finish. Once completed, MongoDB is now repaired.
C:\> mongod --repair
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