| Event Id | 603 |
| Source | ESE |
| Description | process name (process id) nameDatabase 'number': The database engine lost unused pages number-id while attempting space reclamation on a B-Tree (ObjectId %7). The space may not be reclaimed again until offline defragmentation is performed. |
| Event Information | According to Microsoft Cause: Some unused pages were lost when the database engine was attempting to reclaim space. Resolution: The space may not be reclaimed until offline defragmentation is performed, so perform offline defragmentation when convenient. |
| Reference Links | Event Id:603 of Source Id:ESE |
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