Oracle 10g 数据库类型
在通过DBCA来创建Oracle数据库或删除已有数据库的时候。下面来主要说明创建数据库。至于General Databaes（一般用途）的选项，那
在通过DBCA来创建Oracle数据库或删除已有数据库的时候。下面来主要说明创建数据库。
在创建数据库的时候，一般会给你提供三种数据库模板（就是数据库类型）：
一般用途：General Database
事物处理：Transaction Processing
数据仓库：Data Warehouse
定制数据库：Custom Database
下面就Ceneral Database， Transaction Processing，Data WareHouse，即一般用途，事物处理，数据仓库来分别比较说明：
事物处理的英文单词是Online Transaction Processing，简称OLTP，通常意义上是指那些短事物，高并发，读写频繁的数据库系统，数据仓库又被称为Online Analysis Processing ，简称OLAP，是指那些长事物，低并发，多读而少写的数据库系统。
理论上说，oracle数据库中大多数参数在后期是可调的，但也有一些参数一旦创建后期无法调整，比如DB_BLOCK_SIZE，即块大小，，在oracle数据库中是非常重要的一个参数，恰好这个参数在OLTP和OLAP两种类型应用中需求不一致，对于OLTP数据库，数据库常处于小数据量，频繁读写状态，对于这种系统一般不会将DB_BLOCK_SIZE设置太大，以免读写时I/O浪费；而对OLAP数据库，由于系统处于大量数据库的多度而少写状态，因此DB_BLOCK_SIZE设置较大，比如32K。也就是说两种数据库类型的某些层面从定义上是相对立的，如果你能确认你的数据库类型，可以选择Transaction Processing（事物处理）和Data Warehouse（数据仓库）。
至于General Databaes（一般用途）的选项，那是来唬外行的，绝对不建议选择，但是对于一些初学者来说可以试着玩玩，没什么问题的。不多对于业务类型不是特别清除的，想对oracle数据库有一定了解的建议选择Custom Database（定制数据库）来玩玩。
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