communication

130504 2:14:32 [Warning] Aborted connection 13145 to db: 'tjss_pmanager' user: 'xxxx' host: '192.168.0.96' (Got an error writing communication packets) 130504 2:15:13 [Warning] Aborted connection 13146 to db: 'tjss_pmanager' user: 'xxxx' host: '192.168.0.93' (Got an error writing communication packets) 如果你的sleep进程数在同一时间内过多，再加上其他状态的连接，总数超过了max_connection的值，那mysql除了root用户外，就无法再继续处理任何请求无法与任何请求建立连接或者直接down了。所以，这个问题在大负载的情况下还是相当严重的。如果发现你的mysql有很多死连接存在，首先要先检查你的程序是否使用的是pconnect的方式，其次，检查在页面执行完毕前是否及时调用了mysql_close()， 还有一个办法，你可以在my.cnf里面加上wait_timeout和interactive_timeout，把他们的值设的小一些，默认情况下wait

i assume cpu has direct access to motherboard's BIOS and RAM.(correct me if i'm wrong) But how does cpu communicate with other hardware like hdds, expansion cards, peripherals, other BIOSes etc.? I know about OS and its drivers, but they are software- they're in RAM. How does cpu communicate with all this hardware on hardware level? Isn't it limited to only motherboard's BIOS and RAM? In older architectures, peripherals were accessed via a separate mechanism to memory access with special I/O instructions. On x86, there were (and still are!) "in" and "out" instructions for transferring bytes

I have sales people and bean counters who are trying to sell customizations to clients, which is fine. But when a complex change request comes in that I send back a large estimate for, they get confused. Often they come back at me with "Why can't you just add another column?" which by another, they mean a dozen or so custom columns PER client. So far all I can come back with is "We are trying to keep the database well normalized" which means nothing to them. I tell them I can create a system of tables that allows each client to define their own set of custom fields, but of course that takes

What is the difference between HTTPS and SSL? I read about them and found following: HTTPS : HTTPS is a combination of HTTP with SSL/TLS. It means that HTTPS is basically HTTP connection which is delivering the data secured using SSL/TLS. SSL : SSL is a secure protocol that works on the top of HTTP to provide security. That means SSL encrypted data will be routed using protocols like HTTP for communication. I am wondering where is the difference between these two? Or both are identical? The explanation of SSL that you've found is wrong. SSL (Secure Socket Layer) or TLS (Transport Layer

I have a MainActivity which holds HomeFragment HomeFragment has sort button Viewpager which holds 2 fragments when sort button is clicked in HomeFragment , the value has to be passed to ViewPager Fragmensts I google where I found communication between Fragments which is placed directly in MainActivity I tried to solve this by myself with the help of stackoverflow HomeFragment.kt private var sort: Int = 0 private var sortListener: SortListener? = null override fun onActivityCreated(savedInstanceState: Bundle?) { super.onActivityCreated(savedInstanceState) val childFragment = adapter?

I am developing a program to communicate with an old system. I use System.IO.Ports.SerialPort for this. The problem is when I send a longer message, the message bevome corrupt. I use a line listener and get the following results What I sending aa 01 00 00 12 03 06 18 02 c1 94 02 c1 94 00 00 00 00 00 00 00 00 00 00 00 00 1e fd What I get c2 aa 01 00 00 12 03 06 18 02 c3 81 c2 94 02 c3 81 c2 94 00 00 00 00 00 00 00 00 00 00 00 00 1e c3 bd The code I'm using is _comPort.Encoding = new UTF8Encoding(); _comPort.PortName = PortName; //Com1 _comPort.BaudRate = BaudRate; //9600 _comPort.StopBits =

I want to change a variable member of class B, in a method member of class A. Example: A.h: class A { //several other things void flagchange(); } A.cpp: void A::flagchange() { if (human) Bobj.flag=1; } I know that I need an object of class B, to change a variable member of B, but objects of B are not reachable in A. Is it possible by a pointer?? but objects of B are not reachable in A If objects of class B are not reachable by class A there's no way you can modify them. Once you refactored your design, you should pass it as an argument to the function: class A { //several other things void