Re: Not enough quota is available to process this command
1. Disk quotas track and control disk space usage for NTFS Volumes.
2. Prevent further disk space use and log an event when a user exceeds a specified disk space limit, that is, the amount of disk space a user is allowed to use.
From your error it means that the user has exceeds the Disk Limit that was allocated for and when he wants to excute futher queries that requiers certain disk space, The error you have written has greeted him.
Soultion: Either you have to give more disk space to the speified user in the Quota, or remove him from the Quoat and let him excute the query.