want to increase the scalability by configuring the database instance to handle more connections. As a DBA, which configuration would you set to support more than 1,500 connections at a time?
A.You would configure more listeners for the database.
B.You would configure the database in shared server mode to use the connection pooling feature.
C.You would increase the value of the PGA_AGGREGATE_TARGET initialization parameter that assigns more session memory to users.
D.You would decrease the value of the PRIVATE_SGA resource limit in the profiles used by the users to accommodate more session information.
Answer: B
深蓝浅析：
这里为了扩大用户连接数，DBA可以使用共享服务器模式，来建立一个连接池来实现连接比较多的用户的任务，但这种连接是以牺牲一部分性能为代价的。
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深蓝的blog：http://blog.csdn.net/huangyanlong/article/details/39780805