USE master
GO
CREATE DATABASE testbase2
ON
PRIMARY
(NAME = prim_sub_dat1,
FILENAME = 'G:\SQL SERVER2000\prim_sub_dat.mdf',
SIZE = 5MB,
MAXSIZE = 50MB,
FILEGROWTH = 20%),
(NAME = prim_sub_dat2,
FILENAME = 'G:\SQL SERVER2000\prim_sub_dat.ndf'
SIZE = 5MB,
MAXSIZE = 50MB,
FILEGROWTH = 20% ),
FILEGROUP Grouptest1
(NAME = group1_sub1,
FILENAME= 'G:\SQL SERVER2000\group1_sub1_dat.ndf',
SIZE = 5MB,
MAXSIZE = 50MB,
FILEGROUP = 5MB ),
(NAME = group1_sub2,
FILENAME = 'G:\SQL SERVER2000\group1_sub2_dat.ndf',
SIZE = 5MB,
MAXSIZE = 50MB,)
FILEGROUP Grouptest2
(NAME = group2_sub1,
FILENAME = 'G:\SQL SERVER2000\group2_sub1_dat.ndf',
SIZE = 5MB,
MAXSIZE = 50MB,
FILEGROUP = 15%),
(NAME = group2_sub2,
FILENAME = 'G:\SQL SERVER2000\group2_sub2_dat.ndf',
SIZE = 5MB,
MAXSIZE = 50MB,
FILEGROUP =15% )
LOG ON
( NAME = testbase2_log,
FILENMAE ='G:SQL SERVER2000\testbase2_log_file.ldf',
SIZE = 5MB,
MAXSIZE = 25MB,
FILEGROUP = 5MB )
GO
1.
模糊查询效率很低：
原因：
like
本身效率就比较低，应该尽量避免查询条件使用
like
；对于
like ‘%...%’
（全模糊）这样的条件，是无法使用索引的，全表扫描自然效率很低；另外，由于匹配算法的关系，模糊查询的字段长度越大，模糊查询效率越低。
解决办� ......
