Name change of Oracle 11g rollback segments

Oracle 11g New Features

• 09-10-10Oracle 11g new feature: Rman backup skips the free interval
• 09-10-10Oracle 11g new feature: Server Result Cache Test
• 09-10-10Oracle 11g new feature: One of Result Cache
• 09-10-10Oracle 11g new feature: determining the trace file name
• 09-10-10Oracle 11g new feature: Automatic Diagnostic Repository
• 09-10-10Oracle 11g new feature: Fault Diagnosability Infrastructure
• 09-10-10Oracle 11g new feature: spfile Fault-tolerant Enhancement
• New Features of-10-10 Oracle 11G: Memory_target and Automatic Memory Management

In Oracle 11g processing, the rollback segment naming rules are different from before.
In Oracle 10 Gb, the default rollback segment naming rules are as follows:

SQL> select * from v $ version where rownum <2;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0-Prod

SQL> select * from v $ rollname;

USN NAME
----------------------------------------
0 SYSTEM
1 _ SYSSMU1 $
2 _ SYSSMU2 $
3 _ SYSSMU3 $
4_syssmu4 $
5_syssmu5 $
6_syssmu6 $
7 _ SYSSMU7 $
8_syssmu8 $
9 _ SYSSMU9 $
10 _ SYSSMU10 $

11 rows selected.

In Oracle Database 11g, the naming rules are as follows:

SQL> select * from v $ version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0-Production
PL/SQL Release 11.1.0.6.0-Production
CORE 11.1.0.6.0 Production
TNS for Linux: Version 11.1.0.6.0-Production
NLSRTL Version 11.1.0.6.0-Production

SQL> select usn, name from v $ rollname;
USN NAME
----------------------------------------
0 SYSTEM
1 _ SYSSMU1_1189172979 $
2 _ SYSSMU2_1189172979 $
3 _ SYSSMU3_1189172979 $
4 _ SYSSMU4_1189172979 $
5 _ SYSSMU5_1189172979 $
6 _ SYSSMU6_1189172979 $
7 _ SYSSMU7_1189172979 $
8 _ SYSSMU8_1189172979 $
9 _ SYSSMU9_1189172979 $
10 _ SYSSMU10_1189172979 $

11 rows selected.

Pay attention to the changes in the rollback segment during special recovery.