DB2 配置

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DB2 V9默认开启参数：
automatic maintenance / self tuning memory / utility throttling / health monitor
 
automatic maintenance:
a. backup
b. data defragmentation
c. data access optimization
d. statistics profiling
 
1. 内存
参数一：Self Tuning Memory：
开启：db2 update db cfg for <dbname> using self_tuning_mem yes
关闭：db2 update db cfg for <dbname> using self_tuning_mem no
 
参数二：database_memory
自动：db2 update db cfg for <dbname> using database_memory automatic
固定值：db2 update db cfg for <dbname> using database_memory <value>
 
说明：
1. 当Self Tuning Memory开启，并且database_memory 为 Automatic，DB2根据数据库工作负载调节内存
2. 当Self Tuning Memory开启，并且database_memory 为 value，DB2根据数据库工作负载调节内存，在value范围内划分内存
3. self tuning memory调节：buffer pool / package cache / locking memory / sort memory / databaes share memory
不调节：utilities memory

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