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搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...conds
Sun Dec 29 22:03:05.499 [rsHealthPoll] DBClientCursor::init call() failed
Sun Dec 29 22:03:05.499 [rsHealthPoll] replset info 192.168.1.138:27017 heartbeat failed, retrying
Sun Dec 29 22:03:05.501 [rsHealthPoll] replSet info 192.168.1.138:27017 is down (or slow to respond):
Sun Dec 29 22:0...
Why do we check up to the square root of a prime number to determine if it is prime?
...es this might be useful, but this all heavily depends on implementation details (programming language, hardware, data types, libraries), none of which are known in this general consideration.
– Sven Marnach
Aug 3 at 9:38
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How to change the CHARACTER SET (and COLLATION) throughout a database?
...TER DATABASE <database_name> CHARACTER SET utf8 COLLATE utf8mb4_0900_ai_ci;
change table collation:
ALTER TABLE <table_name> CONVERT TO CHARACTER SET utf8 COLLATE utf8mb4_0900_ai_ci;
change column collation:
ALTER TABLE <table_name> MODIFY <column_name> VARCHAR(255) CHARACT...
Store query result in a variable using in PL/pgSQL
...on't leave out the table name prefix on test_table.name or you'll get complaints about an ambiguous reference.
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Simplest way to detect a mobile device in PHP
...('/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda...
中文网（自研/维护）拓展 · App Inventor 2 中文网
... 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 中文网（自研/维护）拓展 ...
Detecting a mobile browser
...f(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|window...
What are some good resources for learning about Artificial Neural Networks? [closed]
...any notions that artificial neural networks have anything to do with the brain but for a passing similarity to networks of biological neurons. Learning biology won't help you effectively apply neural networks; learning linear algebra, calculus, and probability theory will. You should at the very lea...
How to launch an Activity from another Application in Android
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If you don't know the main activity, then the package name can be used to launch the application.
Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.package.address");
if (launchIntent != null) {
startActivity(launchInte...
分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...虑下面的这么几个情况：
1）容灾：数据不丢、结点的Failover
2）数据的一致性：事务处理
3）性能：吞吐量 、 响应时间
前面说过，要解决数据不丢，只能通过数据冗余的方法，就算是数据分区，每个区也需要进行数据冗余处...