OS资源被耗尽，Process J000 is dead
通常建议shmmax设置大些，把sga限制在一个共享内存段中。
Memory Resources The resources provided by the UNIX default kernels are often inadequate for a medium or large instance of Oracle Database. The maximum size of a shared memory segment (SHMMAX) and maximum number of semaphores available (SEMMNS) may be too low for Oracle Database recommendations.
由UNIX默认内核提供的资源往往是不足的中型或大型的数据库实例。最大的共享内存段的大小（SHMMAX）和信号量可用的最大数目（SEMMNS）可能太低对Oracle数据库的建议。
On Windows, fewer resources are needed for interprocess communication (IPC), because the Oracle Database relational database management system is thread-based and not process-based. These resources, including shared memory and semaphores, are not adjustable by the user.
在Windows中，更少的资源用于进程间通信（IPC）所需要的，因为Oracle数据库的关系型数据库管理系统是基于线程的而不是进程。这些资源，包括共享内存和信号量，都是用户不可修改的。