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
Label:MySQL Maximum connection number problem In MySQL source code, the default maximum number of connections is 16384
{"Max_connections", Opt_max_connections,"The number of simultaneous clients allowed.", (gptr*) max_connections,(gptr*) max_connections, 0, Get_ulong, Required_arg, 100, 1, 16384, 0, 1,0},
Appear too many connections problem, at this time there is no way to conn
Tags: cat alter ash machine spfile term text CLI OracleIt 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 optimize the analysis of a robust system program. 1. View the current number of database connections Select COUNT (*) from v$process; --Current number of database
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
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 resource, an HTTP session is createdThe biggest difference between HTTP1.1
MySQL views the maximum number of connections and modifies the maximum number of connections 1. views the maximum number of connections showvariableslike % max_connections %; 2. modifies the maximum number of connections setGLOBALmax_connections200;
MySQL views the maximum number of
Many programs can implement persistent connections through sockets to push messages in real time. However, HTTP requests are usually short connections. When a request ends, the connection to the server is disconnected. The server cannot actively push data to the client, but can only initiate a request from the client, real-time message transmission needs to be implemented on the web, such as instant chat an
First, understand what the number of IIS connections (instantaneous connections)
IIS connection number refers to the number of concurrent connections requested, in several cases: (200M virtual host allow instantaneous connection number of 40 examples)
A, users download your files, the end of normal disconnect, these connectio
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
Tags: style http color using OS IO file dataWhat is a long connection?In fact, a long connection is relative to the usual short connection, that is, long time to maintain the client and the server connection state.The usual short connection operation steps are:Connect-"Data transfer-" close the connection;A long connection is usually:Connect-"Data transmission-" Stay connected-"data transmission-" Stay connected-"...-" close the connection;This requires a long connection in the absence of data c
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
Tags: program blank ext suse process Dalian param Connect UserRelationship between two parameters: Sessions=1.1*processes+5 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 (*) fromv$processSelect COUNT (*) from v$process where program= '
Tags: desc use div ons parameter. sql start ble ora
The current summary of the statement, in view of the data connection is very useful, after writing the program while testing the code side to see the release of database connections to help optimize the analysis of a robust system program. 1.SQL code1.select Count (*) from v$processSelect COUNT (*) from v$process--current number of database
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
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