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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