“_serial_direct_read “
早上爬起来改造一个索引，表数据不太大，70G左右。发现扫描速度很慢，20分钟还没有完成，并且持续产生db file sequential read 等待。
128 14219 4178346 db file scattered read 235/30988/8 0 0
3833 9207 5575144 SQL*Net message to client 1650815232/1/0 -1 1122932962
3711 7340 4456772 db file sequential read 770/131609/1 0 3326192486
1820 41191 3387804 db file sequential read 186/140569/1 -1 3326192486
412 7801 2470376 PX Deq: Execute Reply 200/40/0 0 0
3647 59903 3936612 PX Deq: Execution Msg 268566527/40/0 0 3326192486
3063 10997 839952 PX Deq: Execution Msg 268566527/731/0 0 3326192486
full table scan在oltp环境还是会产生较多不良影响
1） age out cache
2) 产生较多一致性块(如果cache中存在）
3）增加latch活动。
可考虑采用direct path read,alter session set “_serial_direct_read “=true;
需要注意的时oracle会首先触发chekpoint，写入对象的脏数据块，然后才执行direct path read直接读取到pga.
这个方法在批处理任务时更为有效。
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