11/22/2023 0 Comments Sqlpro finished with errorCopying the file(s) and allowing the SSD firmware to repack the physical storage is often a better solution. Defragmentation works differently on solid-state drives (SSD) media and typically doesn't address the problem. We recommend that you create full database backups before you defragment the files as a safety measure. You must shut down SQL Server to perform this operation on the files. For more information on defragmenting drives where SQL Server files reside, see Precautions when you defragment SQL Server database drives and Recommendations. Be sure your defragmentation utility is transactional. For more information, see the note in How DBCC CHECKDB creates an internal snapshot database beginning with SQL Server 2014.ĭe-fragment the volume where the database files reside. Running DBCC CHECKDB on SQL Server 2012 files in ReFS might result in errors. SQL Server 2012 and earlier versions used named file streams instead of sparse files to create CHECKDB snapshots. Using ReFS is the best long-term solution to deal with this issue. If you want to use the current NTFS volume, you must reformat using ReFS after moving your database files elsewhere temporarily. Place the database files on a Resilient File System (ReFS) volume, which doesn't have the same ATTRIBUTE_LIST_ENTRY limits that NTFS presents. ResolutionĬonsider using one or more of the following options to resolve this issue: Each of the backup files or BCP output streams can exhaust the attribute storage as none of them get adjacent storage.įor a complete background of how SQL Server Engine uses NTFS sparse files and alternate data streams, see More information. This will lead to file fragmentation on the same physical media. This process continues for other streams as well. For example, one stream writes to offset between 201 and 400, the other stream writes from 401 to 600, the third stream can write from 601 to 800. If you perform database backups across a stripe set of files all located on the same volume, or if you're bulk copying (BCP-ing) data out to multiple files on the same volume, the writes may end up in adjacent locations but belonging to different files. This behavior is explained in the following KB article: A heavily fragmented file in an NTFS volume may not grow beyond a certain size.īoth regular and sparse files created by SQL Server or other applications can get fragmented to these levels when large amounts of data modifications happen for the life of these snapshot files. Thus, heavy file fragmentation can lead to attribute exhaustion and the resulting 665 error. However, if the space is fragmented, it has to be tracked with multiple attributes. If the space is next to a cluster that's already tracked by the file system, then the attributes are compressed into a single entry. This problem occurs if a large number of ATTRIBUTE_LIST_ENTRY instances are needed to maintain a heavily fragmented file in NTFS. In rare cases, you may observe a non-yielding scheduler issue reported in the SQL Server error log and that SQL Server generates a memory dump. Continuing to wait.Īdditionally, you might also notice blocking when you view various dynamic management views (DMV), such as sys.dm_exec_requests and sys.dm_os_waiting_tasks. In addition to these errors, you may also notice the following Latch Timeout errors: Timeout occurred while waiting for latch: class *'DBCC_MULTIOBJECT_SCANNER'*, id 000000002C61DF40, type 4, Task 0x00000000038089B8 : 16, waittime 600, flags 0x1a, owning task 0x0000000006A09828. If the condition persists, then immediate action must be taken to correct it.` This is usually a temporary condition and the SQL Server will keep retrying the operation. The operating system returned error 1450 (Insufficient system resources exist to complete the requested service.) to SQL Server during a write at offset 0x00002a3ef96000 in file with handle 0x0000000000000D5C. The operating system returned error 665(The requested operation could not be completed due to a file system limitation) to SQL Server during a write at offset 0x00002a3ef96000 in file 'Sam.mdf:MSSQL_DBCC18'
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