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1 设置autotrace
序号 命令 解释
1 SET AUTOTRACE OFF 此为默认值，即关闭Autotrace
2 SET AUTOTRACE ON EXPLAIN 只显示执行计划
3 SET AUTOTRACE ON STATISTICS 只显示执行的统计信息
4 SET AUTOTRACE ON 包含2,3两项内容
5 SET AUTOTRACE TRACEONLY 与ON相似，但不显示语句的执行结果SQL> conn leo/leo
Connected.
SQL> set autotrace on
SQL> select owner,OBJECT_NAME from leo;
OWNER OBJECT_NAME
------------------------------ ------------------------------
APEX_030200 WWV_MIG_ACC_LOAD
APEX_030200 WWV_FLOW_GENERATE_DDL
APEX_030200 APEX_ADMIN
APEX_030200 HTMLDB_ADMIN
APEX_030200 WWV_FLOW_HELP
APEX_030200 APEX_UI_DEFAULT_UPDATE
APEX_030200 APEX_MIG_PROJECTS_UPDATE
SYS DATABASE_SUMMARY
PUBLIC COE_CONFIGURATION
XDB XMLROOT
PUBLIC XMLROOT
OWNER OBJECT_NAME
------------------------------ ------------------------------
PUBLIC COE_NAMESPACES
PUBLIC COE_DOM_HELPER
PUBLIC COE_UTILITIES
PUBLIC COE_TOOLS
LEO LEO
16 rows selected.
Execution Plan
----------------------------------------------------------
Plan hash value: 1174476904
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 34 | 276 (0)| 00:00:04 |
| 1 | TABLE ACCESS FULL| LEO | 1 | 34 | 276 (0)| 00:00:04 |
--------------------------------------------------------------------------
Note
-----
- dynamic sampling used for this statement (level=2)
Statistics
----------------------------------------------------------
4 recursive calls
0 db block gets
1058 consistent gets
0 physical reads
0 redo size
1126 bytes sent via SQL*Net to client
534 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
16 rows processed2 使用SQL
SQL>EXPLAIN PLAN FOR sql语句;
SQL>SELECT plan_table_output FROM TABLE(DBMS_XPLAN.DISPLAY('PLAN_TABLE'));
操作:
SQL> EXPLAIN PLAN FOR select owner,OBJECT_NAME from leo;
Explained.
SQL> SELECT plan_table_output FROM TABLE(DBMS_XPLAN.DISPLAY('PLAN_TABLE'));
或者:
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 1174476904
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 34 | 276 (0)| 00:00:04 |
| 1 | TABLE ACCESS FULL| LEO | 1 | 34 | 276 (0)| 00:00:04 |
--------------------------------------------------------------------------
Note
-----
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
- dynamic sampling used for this statement (level=2)
12 rows selected.
Execution Plan
----------------------------------------------------------
Plan hash value: 2137789089
---------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 8168 | 16336 | 29 (0)| 00:00:01 |
| 1 | COLLECTION ITERATOR PICKLER FETCH| DISPLAY | 8168 | 16336 | 29 (0)| 00:00:01 |
---------------------------------------------------------------------------------------------
Statistics
----------------------------------------------------------
33 recursive calls
12 db block gets
197 consistent gets
0 physical reads
0 redo size
1182 bytes sent via SQL*Net to client
523 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
12 rows processed3 使用Toad,PL/SQL Developer工具
使用 PL/SQL Developer工具 按F5或者点击下图按钮即可
