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简单试验Bulk Binds对性能的提高

发布时间:2019-12-05 02:00:40

简单试验一下Bulk Binds对性能的提高

当Oracle运行PL/SQL时会使用两套引擎,所有procedural code由PL/SQL engine 完成,所有SQL由SQL engine处理。所以如果Oracle从一个collection中循环执行相同的DML操作,那么为了避免两套engine切换所消耗的系统资源,可以使用bulk binds来把所有的DML操作binding到一次操作中完成。这将极大提高PL/SQL的执行效率。

以下是简单的测试,用两种方式插入100000条数据,可以看到效率提高了7倍左右。

代码:--------------------------------------------------------------------------------

SQL> CREATE TABLE test1(

2 id NUMBER(10),

3 description VARCHAR2(50));

Table created

SQL> ALTER TABLE test1 ADD (

2 CONSTRAINT test1_pk PRIMARY KEY (id));

Table altered

SQL> SET TIMING ON;

SQL> DECLARE

2 TYPE id_type IS TABLE OF test1.id%TYPE;

3 TYPE description_type IS TABLE OF test1.description%TYPE;

4

5 t_id id_type := id_type();

6 t_description description_type := description_type();

7 BEGIN

8 FOR i IN 1 .. 100000 LOOP

9 t_id.extend;

10 t_description.extend;

11

12 t_id(t_id.last) := i;

13 t_description(t_description.last) := 'Description: ' || To_Char(i);

14 END LOOP;

15

16 FOR i IN t_id.first .. t_id.last LOOP

17 INSERT INTO test1 (id, description)

18 VALUES (t_id(i), t_description(i));

19 END LOOP;

20

21 COMMIT;

22 END;

23 /

PL/SQL procedure successfully completed

Executed in 141.233 seconds

SQL> truncate table test1;

Table truncated

Executed in 0.631 seconds

SQL>

SQL> DECLARE

2 TYPE id_type IS TABLE OF test1.id%TYPE;

3 TYPE description_type IS TABLE OF test1.description%TYPE;

4

5 t_id id_type := id_type();

6 t_description description_type := description_type();

7 BEGIN

8 FOR i IN 1 .. 100000 LOOP

9 t_id.extend;

10 t_description.extend;

11

12 t_id(t_id.last) := i;

13 t_description(t_description.last) := 'Description: ' || To_Char(i);

14 END LOOP;

15

16 FORALL i IN t_id.first .. t_id.last

17 INSERT INTO test1 (id, description)

18 VALUES (t_id(i), t_description(i));

19

20 COMMIT;

21 END;

22 /

PL/SQL procedure successfully completed

Executed in 27.52 seconds

SQL> select count(*) from test1;

COUNT(*)

----------

100000

Executed in 0.04 seconds

SQL> 查看本文来源

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