MAXLOGFILES :
Specify the maximum number of redo log file groups that can ever be created for the database. Oracle uses this value to determine how much space in the control file to allocate for the names of redo log files. The default, minimum, and maximum values depend on your operating system.
指定数据库可创建的最大重做日志组数。
MAXINSTANCES :
Specify the maximum number of instances that can simultaneously have this database mounted and open. This value takes precedence over the value of initialization parameter INSTANCES. The minimum value is 1. The maximum and default values depend on your operating system.
可同时装载和打开这个数据库的最大实例数。
MAXDATAFILES :
Specify the initial sizing of the datafiles section of the control file at CREATE DATABASE or CREATE CONTROLFILE time. An attempt to add a file whose number is greater than MAXDATAFILES, but less than or equal to DB_FILES, causes the Oracle control file to expand automatically so that the datafiles section can accommodate more files.
The number of datafiles accessible to your instance is also limited by the initialization parameter DB_FILES.
