Get help to use DBCC in SQL server

dbcc help ('?');
go
================================================================================================
checkalloc

checkcatalog

checkconstraints

checkdb

checkfilegroup

checkident

checktable

cleantable

dbreindex

dropcleanbuffers

free

freeproccache

freesessioncache

freesystemcache

help

indexdefrag

inputbuffer

opentran

outputbuffer

pintable

proccache

show_statistics

showcontig

shrinkdatabase

shrinkfile

sqlperf

traceoff

traceon

tracestatus

unpintable

updateusage

useroptions

DBCC execution completed. If DBCC printed error messages, contact your system administrator.
================================================================================================

dbcc help ('checkdb');
go
================================================================================================
dbcc checkdb
(
{ 'database_name' | database_id | 0 }
[ , NOINDEX
| { REPAIR_ALLOW_DATA_LOSS
| REPAIR_FAST
| REPAIR_REBUILD
} ]
)
[ WITH
{
[ ALL_ERRORMSGS ]
[ , [ NO_INFOMSGS ] ]
[ , [ TABLOCK ] ]
[ , [ ESTIMATEONLY ] ]
[ , [ PHYSICAL_ONLY ] ]
[ , [ DATA_PURITY ] ]
[ , [ EXTENDED_LOGICAL_CHECKS ] ]
}
]

DBCC execution completed. If DBCC printed error messages, contact your system administrator.
================================================================================================
dbcc help (sqlperf);
go
================================================================================================
dbcc sqlperf ( LOGSPACE ) [ WITH NO_INFOMSGS ]

DBCC execution completed. If DBCC printed error messages, contact your system administrator.
================================================================================================
dbcc sqlperf ( LOGSPACE )
================================================================================================
Database Name Principal Filegroup Name Log Size (MB) Log Space Used (%) Status
-------------------------- -------------------------- ------------- ------------------ -----------
master PRIMARY 0.7421875 61.57895 0
tempdb PRIMARY 0.9921875 51.08268 0
model PRIMARY 0.7421875 46.05263 0
msdb PRIMARY 0.7421875 58.28947 0
ReportServer$PROD PRIMARY 6.867188 19.17662 0
ReportServer$PRODTempDB PRIMARY 1.054688 37.03704 0
AdventureWorks2008R2 PRIMARY 1.492188 39.39791 0
AdventureWorksDW2008R2 PRIMARY 0.484375 80.04032 0
TESTDB PRIMARY 0.9921875 37.45079 0

(9 row(s) affected)

DBCC execution completed. If DBCC printed error messages, contact your system administrator.


http://msdn.microsoft.com/en-us/library/ms176040.aspx