How to solve "Could not continue scan with NOLOCK due to data movement. in sql server" in SQL Server?

This error message indicates that you are attempting to execute a query in SQL Server with the NOLOCK hint, but the query cannot continue due to data movement in the table being queried.

The NOLOCK hint is used to read data from a table without locking it, which can improve query performance in certain cases. However, when data is being modified or moved in the table, the NOLOCK hint can cause issues, such as data inconsistencies or errors.

Data movement can occur when the table is being modified by another process or user, such as during an index rebuild or data insert. When data movement occurs, the NOLOCK hint can cause the query to read inconsistent or incomplete data, which can result in this error message.

To resolve this issue, you can try one or more of the following solutions:

Avoid using NOLOCK hint: Consider removing the NOLOCK hint from the query and using a different isolation level, such as READ COMMITTED or REPEATABLE READ, which can provide similar performance benefits without the risk of data inconsistencies.
Retry the query: If data movement is occurring in the table, wait until the process is complete before retrying the query with the NOLOCK hint.
Use different isolation level: If you need to use the NOLOCK hint, consider using the READPAST hint instead, which skips over locked rows and can avoid the data movement issue.
Check table fragmentation: Check if the table is heavily fragmented, as this can cause data movement and issues with the NOLOCK hint. If the table is fragmented, consider rebuilding or reorganizing the indexes to reduce fragmentation.

By implementing one or more of these solutions, you should be able to resolve the issue and execute the query successfully.

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