为快捷显示Oracle执行计划创建存储过程
第一种：不设置输出格式参数，即用默认的
[sql] www.zzzyk.com
SQL> create or replace procedure sql_explain(v_sql varchar2)
2 is
3 type explain_cursor_type is ref cursor;
4 explain_cursor explain_cursor_type;
5 a varchar2(2048);
6 begin
7 execute immediate 'explain plan for '||v_sql;
8 open explain_cursor for select PLAN_TABLE_OUTPUT from table(dbms_xplan.display());
9 loop
10 fetch explain_cursor into a;
11 exit when explain_cursor%NOTFOUND;
12 dbms_output.put_line(a);
13 end loop;
14 end;
15 /
Procedure created. www.zzzyk.com
SQL> exec sql_explain('select a.name,b.name from t1 a,t2 b where a.id=b.id and a.id=1');
Plan hash value: 2680223496
--------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 17 | 4 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 1 | 17 | 4 (0)| 00:00:01 |
| 2 | TABLE ACCESS BY INDEX ROWID| T1 | 1 | 8 | 1 (0)| 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | T1_PK | 1 | | 0 (0)| 00:00:01 |
|* 4 | TABLE ACCESS FULL | T2 | 1 | 9 | 3 (0)| 00:00:01 |
--------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - access("A"."ID"=1)
4 - filter("B"."ID"=1)
PL/SQL procedure successfully completed.
SQL> exec sql_explain('select a.name,b.name from t1 a,t2 b where a.id=b.id and a.id=''1''');
Plan hash value: 2680223496
--------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 17 | 4 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 1 | 17 | 4 (0)| 00:00:01 |
| 2 | TABLE ACCESS BY INDEX ROWID| T1 | 1 | 8 | 1 (0)| 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | T1_PK | 1 | | 0 (0)| 00:00:01 |
|* 4 | TABLE ACCESS FULL | T2 | 1 | 9 | 3 (0)| 00:00:01 |
--------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - access("A"."ID"=1)
4 - filter("B"."ID"=1)
PL/SQL procedure successfully completed.
第二种：添加format参数，灵活选择
[sql]
SQL> create or replace procedure sql_explain(v_sql varchar2,v_format varchar2)
2 is
3 type explain_cursor_type is ref cursor;
4 explain_cursor explain_cursor_type;
5 a varchar2(2048);
6 begin
7 execute immediate 'explain plan for '||v_sql;
8 open explain_cursor for select PLAN_TABLE_OUTPUT from table(dbms_xplan.display(null,null,v_format));
9 loop
10 fetch explain_cursor into a;
11 exit when explain_cursor%NOTFOUND;
12 dbms_output.put_line(a);
13 end loop;
14 end;
15 /
Procedure created.
SQL> exec sql_explain('select a.name,b.name from t1 a,t2 b where a.id=b.id and a.id=1','all');
Plan hash value: 2680223496
--------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 17 | 4 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 1 | 17 | 4 (0)| 00:00:01 |
| 2 | TABLE ACCESS BY INDEX ROWID| T1 | 1 | 8 | 1 (0)| 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | T1_PK | 1 | | 0 (0)| 00:00:01 |
|* 4 | TABLE ACCESS FULL | T2 | 1 | 9 | 3 (0)| 00:00:01 |
--------------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
------------------------------------------------------------- &nbs
