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Oracle-insert性能优化

时间:2021-07-01 10:21:17 帮助过:61人阅读

看见朋友导入数据,花了很长时间都没完成!其实有很多快速的方法,整理下! 向表中插入数据有很多办法,但是方法不同,性能差别很

看见朋友导入数据,,花了很长时间都没完成!其实有很多快速的方法,整理下!

向表中插入数据有很多办法,但是方法不同,性能差别很大.


----1.原始语句
drop table t1 purge;

create table t1
(
sid number,
sname varchar2(20)
) tablespace test;

create or replace procedure proc01
(
sname varchar2
)
as
begin
for i in 1..10000000
loop
execute immediate
'insert into t1(sid,sname) values('||i||','''||sname||''')';
commit;
end loop;
end;
/

alter system flush shared_pool;

set timing on;

exec proc01('ocpyangtest');

已用时间: 02: 02: 54.12

----2.绑定变量

drop table t1 purge;

create table t1
(
sid number,
sname varchar2(20)
) tablespace test;


create or replace procedure proc02
(
sname varchar2
)
as
begin
for i in 1..10000000
loop
execute immediate
'insert into t1(sid,sname) values(:no'||','''||sname||''')' using i;
commit;
end loop;
end;
/

alter system flush shared_pool;

set timing on;

exec proc02('ocpyangtest');

已用时间: 00: 22: 59.79


select count(*) from t1;


----3.静态语句

drop table t1 purge;

create table t1
(
sid number,
sname varchar2(20)
) tablespace test;


create or replace procedure proc03
as
begin
for i in 1..10000000
loop

insert into t1 values(i,'ocpyangtest');
commit;
end loop;
end;
/

alter system flush shared_pool;

set timing on;

exec proc03;

已用时间: 00: 20: 42.42

select count(*) from t1;


----4.批量提交


drop table t1 purge;

create table t1
(
sid number,
sname varchar2(20)
) tablespace test;


create or replace procedure proc04
as
begin
for i in 1..10000000
loop
insert into t1 values(i,'ocpyangtest');
end loop;
commit;
end;
/


alter system flush shared_pool;

set timing on;

exec proc04;

已用时间: 00: 11: 48.42

----5.集合


drop table t2 purge;

create table t2
(
sid number,
sname varchar2(20)
) tablespace test;


alter system flush shared_pool;

select count(*) from t1;


set timing on;

insert into t2 select sid,sname from t1;


已用时间: 00: 01: 02.18

commit;


select count(*) from t2;

----6. 集合+append


drop table t2 purge;

create table t2
(
sid number,
sname varchar2(20)
) tablespace test;


alter system flush shared_pool;


select count(*) from t1;

set timing on;

insert /* + append */ into t2 select sid,sname from t1;

已用时间: 00: 00: 36.94


commit;


select count(*) from t2;


----7. 集合+append+nologging


drop table t2 purge;

create table t2
(
sid number,
sname varchar2(20)
) nologging tablespace test;


alter system flush shared_pool;


select count(*) from t1;


set timing on;


insert /* + append */ into t2 select sid ,sname from t1;

已用时间: 00: 00: 35.07

commit;


select count(*) from t2;


----8.数据加载1


drop table t2 purge;

alter system flush shared_pool;

select count(*) from t1;

set timing on;

create table t2
as
select sid,sname from t1;

已用时间: 00: 00: 25.91

select count(*) from t2;


----9.数据加载2


drop table t2 purge;


alter system flush shared_pool;

select count(*) from t1;

set timing on;

create table t2 nologging
as
select sid,sname from t1;

已用时间: 00: 00: 04.89

select count(*) from t2;

----10.数据加载+并行


drop table t2 purge;


alter system flush shared_pool;

select count(*) from t1;

set timing on;

create table t2 nologging parallel 24 --根据自己服务器情况
as
select sid,sname from t1;

已用时间: 00: 00: 02.89


select count(*) from t2;

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