m2m connections

Label: The current summary of the statement, in view of the data connection is very useful, after writing the program while testing the code side to see the release of database connections to help optimize the analysis of a robust system program. 1.SQL code1.select Count (*) from v$processSelect COUNT (*) from v$process--current number of database connections 2.SQL code1.s

Label:data queries involving two of tables in a database are typically implemented using a connection method. Connections are divided into inner and outer connections. Internal connection: The connection result contains only the rows that meet the join criteria, and the two tables participating in the connection should meet the join criteria. External connection: The result of the join cont

What is persistent connection? In fact, persistent connections are relative to common short connections, that is, to maintain the connection between the client and the server for a long time. The common short connection procedure is as follows: Connection-data transmission-close connection; The persistent connection is usually: Connection-data transmission-keep connection... -Close connection; T

is often used in a point-to-multipoint communication. c/S communication. two, long connection and short connection operation process:the procedure for a short connection is to establish a connection--data transfer--to close the connection ... Establish connection--data transfer--close connection;the operation of the long connection is: Establish a connection-data transmission ... (Keep connected) ... Data transfer--close connectionthree, long connection and the use of short connection time:lo

Today began their own study of Nodejs, see poll, under studyHTTP protocol Description:The HTTP protocol is a request/response paradigm, and each HTTP response is generated by a corresponding HTTP request; The HTTP protocol is stateless, and there is no relationship between multiple HTTP requests.In the case of long-connected applications, the client side generally does not actively shut down their connection between the client and the server if the connection is not closed, there will be a probl

Reprint Address: http://blog.csdn.net/lee576/article/details/3245167Explanation 1The so-called long connection refers to the establishment of a socket connection, regardless of whether or not to remain connected, but less security,The so-called short connection refers to the establishment of a socket connection after the data received after the end of the connection, the general bank used short connectionExplanation 2A long connection is a connection that is maintained in TCP-based communication

Recently, I have seen that a certain architecture uses TCP connections instead of HTTP connections. I realized that I don't know the difference between the two, so I can check the information to complete the knowledge. Refer to the following Blog content: Http://blog.csdn.net/yangzl2008/article/details/7366428 Http://blog.csdn.net/xyylchq/article/details/7660915 Http://blog.csdn.net/xuyide54321/article/deta

1, previous misunderstanding:Previously heard that the HTTP is divided into long connections and short connections, the simple long-term connection is the request can be reused, short connection is only one request, and then the protocol is closed, but in fact this sentence is only half, the HTTP protocol is based on the request/Response mode, as long as the server gave a response, This HTTP connection is o

Original: https://www.cnblogs.com/gotodsp/p/6366163.html1. The relationship between the HTTP protocol and the TCP/IP protocol Long connections and short connections to HTTP are essentially TCP long connections and short connections. HTTP belongs to the Application layer protocol, which uses the TCP protocol at

The following section describes how to view the number of connections in redis and simulate concurrent creation of redis connections in php. I think this is quite good. now I will share it with you and give you a reference. Let's take a look at max_redis.php. /Dev/null ");} Link_redis.php Pconnect ('localhost', 6379); $ redis-> auth ('php001'); sleep (100);?> View current