局区 (PGA) memory
Show Parameter Pga_aggregate_target
Show parameter SGA;
#除了SGA_MAX_SIZE, all others are dynamic parameters, that is, parameters that can be modified dynamically during database operation using the ALTER SYSTEM statement
Show Parameter Sga_max_size
#sga颗粒查询
#所有的SAG (each pool) with a minimum of memory unit particles (granule, also called the District Group)
sql> Select Component,granule_size fromv$sga_dynamic_components;
This co
Tags: instruction class update variable content private Area LOB permissionsPga-program Global AreaThe PGA memory area is private and not shared, and any operations initiated by the user against the database, whether queries or updates, are preprocessed in the region before entering the instance area (which is done by the SGA and the system daemon process).What are the main pretreatment?First, save the user's connection information, such as session pr
2011-05-10 14:57:53Category: LinuxFirst, the memory structureSGA (System Global area): Shared by all service processes and background processes;The PGA (Program Global Area): is proprietary to each service process, background process, and each process has a PGA.Second, SGAcontains the data and control information for the instance, including the following memory structure: 1) database buffer cache: Blocks of data retrieved from disk are cached.2) Redo
One, socketSockets are objects that provide the current portability standard for a network application provider on a specific network protocol (such as TCP/IP,ICMP/IP,UDP/IP, etc.). They allow programs to accept and connect, such as sending and receiving data. In order to establish a communication channel, it is extremely important for each endpoint of a network communication to have a socket object.Sockets are part of the core of BSD Unix systems, an
Sock function Introduction
Name of function
Describe
Socket_accept ()
Accept a socket connection
Socket_bind ()
Bind the socket to an IP address and port
Socket_clear_error ()
Clears the socket error or the last error code
Socket_close ()
Close a socke
BYTE order:
Host byte order: Different hosts have different byte order, x86: Small end, network byte order (network byte order): big-endian byte sequence;
0. What is a socketSockets are communications between network processes (network interprocess communication, also known as network IPC) interfaces that enable the process to communicate with other processes, whether on the same computer or not, as an abstraction of the communication endpoint, like a file descriptor Descriptor) is an abstract r
Introduction Java NiO, introduced from JDK1.4, provides a completely different way of working with standard IO. The NIO package (java.nio.*) introduces four key abstract data types that work together to address some of the problems in traditional I/O classes. 1, Buffer: It is a linear table structure that contains data and is used for reading and writing. It also provides a special class for I/O operations for memory-mapped files. 2, Charset: It provides the operation of a Unicode string
Assuming that the TCP socket server is already established and listening to the client's connection, the client can initiate the connection through the socket class. After the client initiates a connection request, it passively waits for a response from the server. This class is also located in the java.net package, which contains many methods for establishing connections, manipulating data flows, and so on
Socket-series socket server-how to communicate with the client, socket serverThe above sections have introduced the working steps of ServerSocket and Socket respectively, and analyzed their operating principles from the application layer to the bottom layer of the system. We have understood their respective parts. Now
Socket series What is socket and socket Series1. What is socket?Socket is the intermediate abstraction layer for communications between the application layer and the TCP/IP protocol family. It is a group of interfaces that the application layer can send and receive data by c
[CPP] View plain copy/*user:lixiujie * date:20101207 *desc:unix (Linux) non-blocking socket communication Epoll model, multiplexing, TCP server-side, sends response information to the client. *file:tcp_server_epoll.c *system:ubuntu64bit * gcctcp_server_epoll.c-otcp_server_epoll *tcp_server_epoll7878 * epoll Function Introduction Epoll is an improved poll of the Linux kernel to handle large batches of handles and is an enhanced version of the select
Java socket packet communication (I) socket establishment, socket Packet
Java socket packet communication (I) socket Establishment
Today, I will share with you how to use socket for communication in java. Let's take a look at TCP/
Java (Socket programming basics), socket programming BasicsI,Two main problems in Network Programming
One is how to accurately locate one or more hosts on the network, and the other is how to transmit data reliably and efficiently after finding the hosts.
In TCP/IP, the IP layer is mainly responsible for locating network hosts and routing data transmission. The IP address can uniquely identify a host on the
processes running on different machines communicate with each other by sending messages to the socket. Each process is like a house, and the socket of the process is a door . sockets are the door between the application process and TCP , and application developers can control everything on the application layer of the socket, but cannot control the side of the
PHP Socket Communication Demo and socket operation class, Phpsocket
Ready to do the Java course design, an address book. Adopt C/S architecture. The client uses Java FX and Java, server side with PHP, socket communication.
Here's a talk about the socket for PHP:
Before you speak , you have to talk about TCP/IP,U
In-depth explanation: the socket communication principle and socket communication principle of php
Are you familiar with TCP/IP, UDP, and Socket programming? With the development of network technology, these words are filled with our ears. So I want to ask:
1. What are TCP/IP and UDP?
2. Where is the Socket?
3. What is
The original meaning of the socket is "hole" or "socket". Here as a 4BDS UNIX process communication mechanism, take the latter meaning. The socket is very similar to a telephone socket. Take a national telephone network for example. Telephone calls are equivalent to each other 2 processes of communication, the area cod
http://www.cnblogs.com/hq-antoine/archive/2012/02/11/2346474.html 1.1 ServerSocket classCreate a ServerSocket class and establish a listening service at the specified port of the computer on which the statement is run, such as:ServerSocket mylistener=new ServerSocket (600);This specifies that the port that provides the listening service is 600, a computer can provide multiple services at the same time, these different services are differentiated by port number, and different services are provide
Php socket programming and php socket programming
Are you familiar with TCP/IP, UDP, and Socket programming? With the development of network technology, these words are filled with our ears. So I want to ask:
1. What are TCP/IP and UDP?2. Where is the Socket?3. What is Socket
relatively simple;4. Flow mode and datagram mode;5.TCP guarantees data correctness, UDP may drop packets, TCP guarantees data order, UDP is not guaranteed. TCP fails to retransmit, UDP does notNext, let's look at the socket programming that works in the application layer:Sockets are a way of communicating with other programs using the standard UNIX file descriptor (descriptor). Sockets can be thought of as communication connection endpoints for two p
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