1.保留内存连续空间不能满足请求分配;
2.共享池中库高速缓存没有足够的连续空间满足请求；
可根据查询视图V$shared_pool_reserved
SELECT free_space, avg_free_size,used_space, avg_used_size, request_failures, last_failure_size
FROM v$shared_pool_reserved
考虑调整:
shared_pool_size,shared_pool_reserved_size,
shared_pool_reserved_min_alloc
如果rq_failures>0,且last_failure_size>shared_p_r_m_alloc则应该增加shared_pool_size和
shared_pool_reserved_min_alloc
如果rq_failues，且last_failure_size
