The database consistency checker (dbcc) provides commands for checking the logical and physical consistency of a database. The dbccdb database stores the results of dbcc when dbcc checkstorage or dbcc checkverify is used.
dbcc checkstorage records configuration information for the target database, operation activity, and the results of the operation in the dbccdb database. Stored in the database are dbcc stored procedures for creating and maintaining dbccdb and for generating reports on the results of dbcc checkstorage operations.
See Checking Database Consistency in the System Administration Guide: Volume 2.