突然发现ORACLE数据库响应速度慢了很多，检查ALERT文件发现下列错误：
found dead multi-threaded server 'S000', pid = (9, 1)
found dead multi-threaded server 'S001', pid = (10, 1)
found dead multi-threaded server 'S002', pid = (36, 4)
found dead multi-threaded server 'S005', pid = (14, 1)
这是怎么回事，怎么解决。
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