Hi Ajay,
Looks like the dbcc dbroot is available in your version:
1> disk init name=tempdb2,physname='/i113249/rel155/data/tempdb2.dat',size='100M'
2> go
1> create temporary database tempdb2 on tempdb2=100
2> go
CREATE DATABASE: allocating 25600 logical pages (100.0 megabytes) on disk
'tempdb2' (25600 logical pages requested).
Database 'tempdb2' is now online.
1> dbcc dbreboot
2> redset
3> reset
1> dbcc dbreboot(reboot,tempdb2)
2> go
---------- Shutting Down Database 'tempdb2' ----------
---------- Re-starting Database 'tempdb2' With Recovery ----------
---------- Operation on Database 'tempdb2' Completed Successfully ----------
1> select @@version
2> go
Msg 102, Level 15, State 1:
Server 'jbdsrv155', Line 1:
Incorrect syntax near '.
1> select @@version
2> go
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Adaptive Server Enterprise/15.5/EBF 19396 SMP ESD#5/P/RS6000/AIX 5.3/asear155/2
568/64-bit/FBO/Thu Dec 8 23:37:47 2011
(1 row affected)