connection

问题 I have the same problem as this when I want to index a very large table on one of its non-unique columns which is an integer, and I tried all the solutions that are proposed in that post that has at least one vote up. I still couldn't fix it. Any other ideas? I have enough memory: max_allowed_packet: 2G, innodb_buffer_pool_size: 9G All the time out settings mentioned in this post and here are set to much higher numbers than the default. 回答1: While this is not necessary an answer for loosing

问题 I have the same problem as this when I want to index a very large table on one of its non-unique columns which is an integer, and I tried all the solutions that are proposed in that post that has at least one vote up. I still couldn't fix it. Any other ideas? I have enough memory: max_allowed_packet: 2G, innodb_buffer_pool_size: 9G All the time out settings mentioned in this post and here are set to much higher numbers than the default. 回答1: While this is not necessary an answer for loosing

问题 Please tell me how to connect and disconnect mobile broadband connection using C# or DOS? 回答1: There is no native support in .NET, you need to invoke the win api, specifically wininet.dll and invoke InternetGetConnectedState function. You can use the following link for with a sample code. Code is in VB, but you can easily convert it to c#. How to determine the connection state of your local system and how to initiate or end an Internet connection 回答2: On the commandline (DOS) you can use the

问题 I downloaded and installed the Microsoft Connector for Oracle by Attunity from the following location for VS 2015 to use with SQL Developer 2014: https://www.microsoft.com/en-us/download/details.aspx?id=44582 It installed correctly, but for some reason I cannot find it in VS 2015. The following post shows where to find it in another version of VS under some SSIS tabs when adding new toolbox controls: Attunity SSIS not available in SSIS Data Flow Tasks But those tabs don't exist in VS 2015. I

问题 I have an application that fires a mysql command (query) "show databases", the query works and returns properly but I can't close my connections. The user I used had 24 connections allowed at the same time so the problem popped up further down my program but reducing the allowed connections to 2 shows me that I can't even close the first query (which isn't in a loop). The code is the following: protected override Dictionary<string, Jerow_class_generator.Database> loadDatabases() {

问题 I'm trying to close bluetooth service, but Bluecove has bug on Connection close method (https://code.google.com/p/bluecove/issues/detail?id=90) and I am trying to do some workaround to restart service. I think restarting bluetooth stack will solve my problem. Can I do it programmatically? I'am using microsoft bluetooth stack. 回答1: Problem solved in this way. I restart the application, but firstly shut down bluecove manually. BlueCoveImpl.shutdown(); If I only restart application, bluecove

问题 I have a class for each database table object. Each class takes care of connection/queries/data format (database table specific logic) as I prefer to assign a connection for each class for better modularity. Also, I am using specific connections for some tables and queries. My question is how can I check if a connection already exists so it won't start another one? Basically I want to check if the connection with the same username/password/database has already been made. Or is this not

问题 I am getting error 18456 from SQL Server Management Studio when I try to connect Windows Authentication or SQL Server Authentication as in the pictures below. Windows Authentication SQL Server Authentication I want to implement the solution in this link: Login to Microsoft SQL Server Error: 18456 but I can't start the engine in no way. Also, I don't know my password for SQL Server Authentication. What can I do? 回答1: I have seen this problem very often with SQL Server 2012 and later versions

问题 I am running a local apache server on an ubuntu machine, and i am trying to use the phpmailer class to send mail. It tries to connect by fsockopen to the mail server, but it throws a timeout error. I tried setting the timeout to 15sec with no luck. It does work on other machines. How can i find out if my ISP has blocked requests ? The mail server responds to ping. 回答1: ping and SMTP command don't go via the same port ; it is possible that one port is opened, and not the other one. If there is

问题 Assuming I do not have a Grid setup, what is the Maximum number of simultaneous Chrome threads I can start from Selenium WebDriver? Is it 5? And does it hold good for Chrome Headless as well? 回答1: Browser connection limitations Browsers limit the number of HTTP connections with the same domain name. This restriction is defined in the HTTP specification (RFC2616). Most modern browsers allow six connections per domain where as most of the older browsers allow only two connections per domain.