DBCC CHECKALLOC   - Check consistency of disk allocation.
DBCC CHECKCATALOG - Check catalog consistency
DBCC CHECKCONSTRAINTS - Check integrity of table constraints.
DBCC CHECKDB    - Check allocation, and integrity of all objects.
DBCC CHECKFILEGROUP - Check all tables and indexed views in a filegroup.
DBCC CHECKIDENT - Check identity value for a table.
DBCC CHECKTABLE - Check integrity of a table or indexed view.
DBCC CLEANTABLE - Reclaim space from dropped variable-length columns.
DBCC dllname    - Unload a DLL from memory.
DBCC DROPCLEANBUFFERS - Remove all clean buffers from the buffer pool.
DBCC FREE... CACHE  - Remove items from cache.
DBCC HELP        - Help for DBCC commands.
DBCC INPUTBUFFER - Display last statement sent from a client to a database instance.
DBCC OPENTRAN    - Display information about recent transactions.
DBCC OUTPUTBUFFER - Display last statement sent from a client to a database instance.
DBCC PROCCACHE   - Display information about the procedure cache
DBCC SHOW_STATISTICS - Display the current distribution statistics
DBCC SHRINKDATABASE - Shrink the size of the database data and log files.
DBCC SHRINKFILE  - Shrink or empty a database data or log file. 
DBCC SQLPERF     - Display transaction-log space statistics. Reset wait and latch statistics.
DBCC TRACE...    - Enable or Disable trace flags
DBCC UPDATEUSAGE - Report and correct page and row count inaccuracies in catalog views
DBCC USEROPTIONS - Return the SET options currently active
DBCC deprecated commands
DBCC Undocumented commands