You are not using your KEEP pool to cache frequently referenced tables and indexes. This may cause unnecessary I/O. When configured properly, the KEEP pool guarantees full caching of popular tables and indexes. Remember, an average buffer get is often 100 times faster than a disk read. Any table or index that consumes > 10% of the data buffer, or tables & indexes that have > 50% of their blocks residing in the data buffer should be cached into the KEEP pool. You can fully automate this process using scripts.

对使用KEEP池的建议：对于任何消耗10％data buffer的表或索引，或者任何表或索引的50%数据块在data buffer池里，都建议应该保存在KEEP池里。