4j connections

Five features of the 1.HTTP protocol1) Support client/server mode2) Simple and fast3) Flexible4) No connectionEach connection processes only one request, and the server finishes processing the customer's request and is disconnected after being answered by the customer.5) No StatusThe protocol does not log server client status.2. Two ways to keep the HTTP connection state1) CookiesWhen accessing a unified Web site, information can be written to cookies to facilitate the extraction of information

How to set the number of mysql connections (Too connections) and mysqlconnections When using mysql, it is found that the number of connections has exceeded ~~~~ [Root @ linux-node1 ~] # Mysql-u glance-h 192.168.1.17-p Enter password: ERROR 1040 (08004): Too connector connections Solution: this is also the practice of m

Analysis of persistent connections and short connectionsA persistent connection means that multiple data packets can be sent continuously over a TCP connection. If no data packet is sent during TCP connection persistence, both parties need to send a detection packet to maintain this connection, generally, you need to maintain it online. A short connection is a TCP connection established when both parties have data interaction. After the data is sent,

Oracle views the maximum number of connections allowed and the number of current connections among other information the relationship between the maximum number of concurrent connections in oracle: sessions1.1 * processes5 currently summarized statements, useful in viewing data connections, after writing the program, y

This paper summarizes shares the concept of long connection and short connection involved in network programming. keyword: keep-alive, concurrent connection limit, Tcp,httpFirst, what is a long connectionHTTP1.1 Specifies that long connections are maintained by default (HTTP persistent connection, also translated as persistent), data transfer is done to keep the TCP connection continuously open (no RST packet, no four handshake), waiting for the same

Reprinted from http://blog.csdn.net/shine0181/article/details/7799754/HTTP for long connections HTTP is statelessThat is, the browser and the server each HTTP operation, the connection is established, but the end of the task to disconnect. If a client browser accesses an HTML or other type of Web page that contains other Web resources, such as JavaScript files, image files, CSS files, and so on, when the browser encounters such a Web reso

HTTP for long connections HTTP is stateless That is, the browser and the server each HTTP operation, the connection is established, but the end of the task to disconnect. If a client browser accesses an HTML or other type of Web page that contains other Web resources, such as JavaScript files, image files, CSS files, and so on, when the browser encounters such a Web resource, an HTTP session is createdThe biggest difference between HTT

What is a long connection HTTP1.1 Specifies that long connections are maintained by default (HTTP persistent connection, also translated as persistent), data transfer is done to keep the TCP connection continuously open (no RST packet, no four handshake), waiting for the same domain name to continue to use this channel to transfer data The opposite is a short connection. HTTP header connection:keep-alive is an experimental extension of the HTTP1.0 br

Tags: nbsp stream file Table L database ONS access upd my.cnf 1. View the maximum number of connectionsShow variables like '%max_connections% ';2. Modify the maximum number of connectionsSet GLOBAL max_connections = 200; The following article is mainly to introduce you to the MySQL maximum connection number of changes, we all know that MySQL maximum connection number of the default value is 100, this value for a number of concurrent connections to the

Long connections and short connectionsThe so-called long connection, refers to a TCP connection can be continuously sent multiple packets, during the TCP connection remains, if no packet sent, need to send a detection packet to maintain this connection, usually need to do their own online maintenance.Short connection refers to the communication between the two parties have data interaction, the establishment of a TCP connection, after the data is sent

----------------------------------------------------- Workarea_size_policy string AUTO Pga consists of three parts, including sort_area_size that can be configured, session information, and stack space. Sort_area_size is the memory space used for sorting: SQL> show parameter sort_area_sizeNAME TYPE VALUE-----------------------------------------------------Sort_area_size integer 524288 If the sorting data volume is large and the sorting space is insufficient, Oracle uses a dedicated algorithm t

workarea_size_policy Name type value-------------------------------------------------------------Workarea_size_policy string auto PGA consists of three parts, including sort_area_size that can be configured, session information, and stack space. Sort_area_size is the memory space used for sorting: SQL> show parameter sort_area_size Name type value-----------------------------------------------------------------Sort_area_size integer 524288 If the sorting data volume is large and the sorting spa

MySQL view maximum number of connections and modify maximum connections1. View the maximum number of connectionsShow variables like '%max_connections% ';2. Modify the maximum number of connectionsSet GLOBAL max_connections = 200;The following article is mainly to introduce you to the MySQL maximum connection number of changes, we all know that MySQL maximum connection number of the default value is 100, this value for a number of concurrent

Tags: order inline category label IMM play article Pfile row Tags: Oracle database 2017-01-04 14:40 6709 People read comments (0) favorite reports Classification:database (Wuyi) Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced. It is useful to look at the connection of the data, finish writing the program while testing the code side to see the release of database connections to help optimiz

increase the value as appropriate, but it should never be smaller. Otherwise, you will be at your own risk... 2) tcp_tw_recycleEnable fast reconfiguring of sockets in time-Wait status. The defaultvalue is 0 (Disabled). It shocould not be changed without advice/request of technical experts.This configuration item can be used to quickly recycle sockets in the time_wait state for reallocation. The configuration is disabled by default and can be enabled if necessary. However, after you enable this

HTTP is a text transfer protocol that works at the application level, and its implementation at the bottom is based on the TCP protocol, and today's HTTP long and short connections are essentially TCP's long connections and short connections. long and short connections for TCP:When a TCP connection transmits data bet

Check the maximum number of connections allowed by the oracle database and the current number of connections. Step 1: On the cmd command line, enter sqlplus Step 2: Enter the user name and password as prompted 1. view the processes and sessions Parameters SQL> show parameter processes NAME TYPE VALUE Db_writer_processes integer 1 Gcs_server_processes integer 0 Job_queue_processes integer 10 Log_archive_max

Deepen understanding of Oracle outer connections (left/right/full), inner connections (oracleinner), andOracle's left join, right join, and (+) Outer Join types are always confused. The experiment is used to deepen the understanding of the connection type syntax. There are three types of external connections: 1. left outer Join, corresponding SQL Keyword: LEFT (O

First, understand what is the number of IIS connections (instant connections) The number of IIS connections refers to the number of concurrent requests in several cases: (taking m virtual hosts as an example) A. the user downloads your files at a single point and is disconnected normally after completion. These connections