为您找到相关结果280,898个
详细聊聊Oracle表碎片对性能有多大的影响_oracle_脚本之家
占用数据块及空闲数据块下降,并且cost使用也下降 1 2 3 4 5 SELECT TABLE_NAME, (BLOCKS * 8192 / 1024 / 1024) - (NUM_ROWS * AVG_ROW_LEN / 1024 / 1024) “Data lower than HWM in MB” FROM USER_TABLES WHERE table_name = ‘T1'; 1 select blocks,empty_blocks,num_rows from user_table...
www.jb51.net/article/2412...htm 2024-9-8
Code Review 方法论与实践总结梳理_javascript技巧_脚本之家
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 private static final String MONEY_DISPLAY_TEXT_PATTERN = "%s %s"; private BillVO convertBillDTO2BillVO(BillDTO billDTO) { if (billDTO == null) { return null; } BillVO billVO = new BillVO(); billVO.setCostDisplayText(buildMoney...
www.jb51.net/article/2745...htm 2024-9-9
Tensorflow训练模型越来越慢的2种解决方案_python_脚本之家
step: 13, time cost: 1.6584930419921875 step: 14, time cost: 1.6765813827514648 step: 15, time cost: 1.6751370429992676 step: 16, time cost: 1.7304580211639404 step: 17, time cost: 1.7583982944488525【时间均衡】1 2 3 4 5 6 7 8 9 10 11 12 13 14 2019-05-15 13:03:49.394354: I tensorflow...
www.jb51.net/article/1797...htm 2024-9-7
Apache Commons Math3学习之数值积分实例代码_java_脚本之家
TimeCostCalculator tcc = new TimeCostCalculator(); tcc.runTest(new CalcSimpsonIntegrator()); } } /** * 使用辛普森法求解数值积分。Apache.Common.Math3中所用的辛普森法是采用逼近法,即先对整个积分区间用矩形积分,然后将区间分解为4份,再次积分,比较两次积分的差值,若想对误差大于某个预订数值, * ...
www.jb51.net/article/1262...htm 2024-9-7
Python数学建模PuLP库线性规划进阶基于字典详解_python_脚本之家
-(3)使用 遍历循环结构 设置目标函数和约束条件,例如:AlloyModel += pulp.lpSum([cost[item] * mass[item] for item in material]), “总生产成本” AlloyModel += pulp.lpSum([mass[item] for item in material]) == 1000, “质量约束”2、线性规划问题案例本篇以合金钢材生产投料问题为例,分析基于...
www.jb51.net/article/2256...htm 2024-9-8