问题 set line 120
select SQL_ID,event,count(*) from gv$session where wait_class <> Idle group by event,SQL_ID order by count(*);排查思路 oracle等待事件之free buffer waits Free buffer waits 等待事件总结 free buffer waits
尝试解决方案
修改db_writer…
os: centos 7.6 db: oracle 19.3
使用 swingbench 做的10G数据量压测,然后查看 AWR 报表时,分析一下 Top 10 Foreground Events by Total Wait Time. buffer busy waits 10.3.2 buffer busy waits
This wait indicates that there are some buffers in the buffer cache that…
常见的算法有:
枚举贪心动态规划搜索分治和递归
0-1背包是个典型的动态规划算法。
啰嗦一句,动态规划属于运筹学,美国数学家bellman是运筹学的创建者。
0-1背包代码的逻辑如下: v a l ( i , p ) v a l ( i − 1 , p ) , p ≥…