Too many query locator rows 10001 error salesforce

Too many query locator rows: 10001 

This error occurs when you are using a queryLocator to query the records from Salesforce. As per the apex governor limit documentation, the number of records returned by the queryLocator should not exceed 10000.

What is the solution?

You need to add the limit of 1000 to your query.

Database.getQueryLocator([SELECT Id FROM Account limit 10000]);

Now the query will limit the records up to 10000, so you won't get the error.

What is queryLocator?

Querylocator is a set of records returned by a database that you can iterate using QueryLocatorIterator.

Resources

Apex Governor Limits

QueryLocator 

QueryLocatorIterator Class