此外，每次连接都与一个DB 2代理相关，该代理也导致一些内存成本。
In addition, each connection is associated to a DB2 agent which also incurs some memory cost.
由于每个维度表过滤的选择度，每次连接都会减少事实表大小的十分之一。
Each join reduces the size of the fact table by one-tenth due to selectivity of the table filter on each dimension table.
数据源语句缓存大小指定每次连接可以缓存的经过准备的jdbc语句的数量。
Data source statement cache size specifies the number of prepared JDBC statements that can be cached per connection.
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