Oracle 9i与10g中plan_table的不同

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Oracle 9i与10g中plan_table的不同：
　
　　Oracle 9i中查看plan_table：
　
　　  sys@DG1> select * from v$version;

BANNER
--------------------------------------------------------
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
PL/SQL Release 9.2.0.4.0 - Production
CORE 9.2.0.3.0 Production
TNS for Linux: Version 9.2.0.4.0 - Production
NLSRTL Version 9.2.0.4.0 - Production

sys@DG1> set autotrace on explain;
sys@DG1> select * from plan_table;

no rows selected

Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 TABLE ACCESS (FULL) OF "PLAN_TABLE"
 

　
　　Oracle 10g中查看plan_table：
　
　　  SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Prod
PL/SQL Release 10.2.0.2.0 - Production
CORE 10.2.0.2.0 Production
TNS for Solaris: Version 10.2.0.2.0 - Production
NLSRTL Version 10.2.0.2.0 - Production

SQL> set autotrace on explain
SQL> select * from plan_table;

no rows selected

Execution Plan
----------------------------------------------------------
Plan hash value: 103984305

----------------------------------------------------------
-

| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
|

----------------------------------------------------------
-

| 0 | SELECT STATEMENT | | 1 | 11081 | 2 (0)| 00:00:01
|

| 1 | TABLE ACCESS FULL| PLAN_TABLE$ | 1 | 11081 | 2 (0)| 00:00:01
|

-----------------------------------------------------------
-

Note
-----
- dynamic sampling used for this statement
 

　
　　结论：
　
　　Oracle 10g中不再需要创建plan_table表，因为它会自动创建一个数据字典表PLAN_TABLE$.