1)Active Session History Reports (ASH): ASH can be used to identify blocking session and waiting session and associated transaction identifiers and SQL for a specified duration.
2)Automatic PGA Memory Management: PGA memory can be managed dynamically and new view V$PROCESS_MEMORY has been added.
3)Automatic Shared Memory Management: Many of the SGA memory components can be dynamically sized by using automatic memory management.
4)Automatic Tuning of Multiblock Read Count: The DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter is now automatically tuned to use a default value when this parameter is not set explicitly.
5)Automatic Workload Repository(AWR)Reports: Various AWR reports help us to get statistics between two snapshot id.
6)Automatic Workload Repository SQL Collection can be configured: The AWR collects, process and maintain statistics of Top SQLs. Moreover the collection criteria can be configured.
7)Database Replay: With this feature database workload of a production database can be captured and then it can be replayed/tested on a test system as the same way as recorded was in production system with the same timing, concurrency, and transaction dependencies of the production system. On 10.2g only workload can be captured and it can be replayed on 11.1g.
8)End to End Application Tracing: End to end application tracing diagnosis performance problem in a multitier environment. With this feature you can identify the source of an excessive workload, such as a high load SQL statement, and allow you to contact the specific user responsible.
9)Improved System Statistics: The V$SYSSTAT view has added rows to capture the total number of physical I/O's performed by any Oracle process.
10)SQL Access Advisor: The DBMS_ADVISOR package and SQL Access Adviser advised different recommendation based on query.
11)SQL Performance Analyzer: It enables you to forecast the impact of system changes on SQL performance .
13)SQL Tuning Advisor:
14)SQL Tuning Sets: With DBMS_SQLTUNE package SQL Tuning sets can be export and imported to another system.
15)V$SQLSTATS View: V$SQLSTATS returns performance statistics.