Each database of MS SQLServer contains:
1 master data file (.mdf) required.
1 transaction log file (.ldf) required.
Can contain:
any number of secondary data files (.ndf)
multiple transaction log files
CREATE DATABASE DATABASENAME ON PRIMARY--配置主数据文件的选项
（
name ='databases_data',--represents the logical name of the database
filename ='path/databases_data.mdf',--represents the physical file name of the database
size =xxMB,--represents the initial size of the database
maxsize=xxMB,--represents the maximum size of the database
filegrowth=xx--Indicates the growth rate of the file (can be a percentage or MB)
）
LOG ON --配置日志文件的选项
(
name ='databases_log,--represents the logical name of the database
filename ='path/databases_log.ldf,--represents the physical file name of the database
size =xxMB,--represents the initial size of the database
maxsize=xxMB,--represents the maximum size of the database
filegrowth=xx--Indicates the growth rate of the file (can be a percentage or MB)
)