oracle insert into as select,比较create table as select * 与 insert into table select *

实验环境：

SYS@aaron> select * from v$version;

BANNER

--------------------------------------------------------------------------------

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production

PL/SQL Release 11.2.0.1.0 - Production

CORE 11.2.0.1.0 Production

TNS for Linux: Version 11.2.0.1.0 - Production

NLSRTL Version 11.2.0.1.0 - Production

实验步骤：

1 首先创建一个原始表test01，大小为504M

SEGMENT_NAME SEGMENT_TYPE TABLESPACE_NAME BLOCKS EXTENTS BYTES/1024/1024

-------------------- ------------------ ------------------------------ ---------- ---------- ---------------

TEST01 TABLE EXAMPLE 64512 134 504

2 使用create table test02 as select * from test01 创建表test02并观察执行时间与产生的日志量

SYS@aaron> set timing on

SYS@aaron> create table test02 tablespace example as select * from test01;

Table created.

Elapsed: 00:00:14.70

SYS@aaron> alter system switch logfile

产生归档日志如下：

-rw-r----- 1 oracle oinstall963KDec 24 19:12 1_128_864773796.dbf

3 使用insert into table test02 as select * from test01, 观察效率与产生的日志量

SYS@aaron> drop table test02;

Table dropped.

SYS@aaron> create table test02 as select * from test01 where 0=1;

Table created.

SYS@aaron> alter system switch logfile;

System altered.

SYS@aaron> insert into test02 select * from test01;

4523648 rows created.

Elapsed: 00:02:12.30

产生的日志量为：

-rw-r----- 1 oracle oinstall 49M Dec 24 19:16 1_130_864773796.dbf

-rw-r----- 1 oracle oinstall 44M Dec 24 19:16 1_131_864773796.dbf

-rw-r----- 1 oracle oinstall 49M Dec 24 19:16 1_132_864773796.dbf

-rw-r----- 1 oracle oinstall 49M Dec 24 19:17 1_133_864773796.dbf

-rw-r----- 1 oracle oinstall 49M Dec 24 19:17 1_134_864773796.dbf

-rw-r----- 1 oracle oinstall 49M Dec 24 19:17 1_135_864773796.dbf

-rw-r----- 1 oracle oinstall 47M Dec 24 19:17 1_136_864773796.dbf

-rw-r----- 1 oracle oinstall 49M Dec 24 19:18 1_137_864773796.dbf

-rw-r----- 1 oracle oinstall 49M Dec 24 19:18 1_138_864773796.dbf

-rw-r----- 1 oracle oinstall 49M Dec 24 19:18 1_139_864773796.dbf

-rw-r----- 1 oracle oinstall 45M Dec 24 19:18 1_140_864773796.dbf

-rw-r----- 1 oracle oinstall 12K Dec 24 19:19 1_141_864773796.dbf

总结：使用create table as select *的方式更有效率并且几乎不会产生归档日志。

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oracle insert into as select,比较create table as select * 与 insert into table select *

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