# Operations Errors

## ERROR 2625: Operation 'BACKUP DATABASE' can't be executed on internal database('') utilized by SingleStore. 

**Issue**

This error occurs when you attempt to backup the `cluster` or `memsql` databases.

**Solution**

These databases are internal system databases, and as such, they cannot and do not need to be backed up.

## ERROR: Partition’s table metadata are out of sync for table

**Issue**

The most common cause for this error is an `ALTER TABLE` query on a sharded table which ran partially but didn’t complete successfully. This may leave table metadata in an inconsistent state where some partitions have the old metadata while some have the new.

**Solutions**

If the cause of the issue was a failed `ALTER TABLE` as described above, possible solutions are:

* Recreate the table. This can be done by insert-selecting the data into a newly created table or reloading the data. For example: `sql CREATE TABLE t_copy AS SELECT * FROM t; DROP TABLE t; ALTER TABLE t_copy RENAME AS t;`
* Find the partition(s) with inconsistent table metadata, and manually run `ALTER` on the leaf partitions to correct them.

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Modified at: August 28, 2023

Source: [/cloud/reference/troubleshooting-reference/operations-errors/](https://docs.singlestore.com/cloud/reference/troubleshooting-reference/operations-errors/)

(An index of the documentation is available at /llms.txt)