Java pool memory is used in server memory for all session-specific Java code and data
within the JVM. Java pool memory is used in different ways, depending on what mode
the Oracle server is running in.
The Java Pool Advisor statistics provide information about library cache memory used
for Java and predict how changes in the size of the Java pool can affect the parse rate.
The Java Pool Advisor is internally turned on when statistics_level is set to
TYPICAL or higher. These statistics reset when the advisor is turned off.
1. jvm 或者session-specific Java code
2. 当statistics_level设置为TYPICAL或者更高级别时, The Java Pool Advisor is internally turned on
3. 当advisor关闭时, 统计数据被重置
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