First, prohibit the program to produce index files
Pre-read files cause system startup to slow because the index files generated when you run the program are read. Therefore, we only need to prohibit the production of PF files.
PHP: examples of how to quickly read large files. In PHP, the fastest way to read large files is to use functions such as file and file_get_contents, several simple PHP lines and several examples of quick reading of large files
In PHP, the quickest way to
How PHP can quickly read large files
In PHP, the quickest way to read files is to use functions such as file and file_get_contents, A few simple lines of code can perfectly complete the functions we need. However, when the operated file is a relatively large file, these functions may not be able to work properly. The f
At the end of last year, a variety of Web site account information database leakage, is to force Ah, took the opportunity to download a few databases, ready to learn data analysts to analyze these account information. Although these data information has been "collated", but it is useful to learn by themselves, after all, there is such a large amount of data. the large amount of data brings the problem is a single file is very large, can open this file is quite difficult, notepad do not expect,
Tag: Log log php large file read large file writeIn the usual learning and development, because we seldom have access to large amounts of data read and write, so when the need suddenly, we canCan still follow some relatively fast methods, such as File_get_contents,fread and other methods to read the file, but so since if the file
How to read large files using PythonBackground
When a text file is recently processed (the file size is about 2 GB ),memoryErrorErrors and files are too slow to read. Later, I found two fastLarge File ReadingThis article describes the two reading methods.
Original URLPreparations
When talking about "text processing", w
Random reading and writing of files in JavaThe Java.io package provides a Randomaccessfile class for random file creation and access. Using this class, you can jump to and write data anywhere in the file. A program can insert data into a random file without destroying other data in that file. In addition, the program can update or delete previously stored data without overwriting the entire file.
The Randomaccessfile class is a direct subclass of the
PHP file Processing-read files (one character, string)
Reading a file can not only read the entire file, but also not only read a row of data, but also read a character, can read a string of a specified length!
In the previous ar
This article mainly introduces how to load and read XML files in javascript, and analyzes the implementation steps and operation skills related to loading and reading xml files in javascript in the form of examples, for more information about how to load and read XML files i
A way for Linux shells to read files line by rowIn Linux there are many ways to read a file row by line, the most common is the method in the following script, and is the most efficient, most used method. In order to give you an intuitive feeling, we will test the execution efficiency of various methods by generating a large file.Method 1:while the most efficient
I sorted out several methods for reading files in PHP for future reference. 1. freadstringfread (int $ handle, int $ length) fread () reads a maximum of length bytes from the file pointed to by handle. This function can be read by a maximum of length bytes, or reaches the EOF, or (for network streams) when a package is available
I sorted out several methods for reading
For ultra-large files, we use common file reading methods very slowly and very slow. in java, we provide the RandomAccessFile function for me to quickly read ultra-large files without getting stuck, see one of my demo instances below.
The log files on the server are usually more than 400 mb. Reading simple
: = Make ([]byte, 1024x768) for {//Read file must create a buffer to read the contents of F into the BUF, Returns an n indicating the length of the read, and the ERR error message N, err: = F.read (BUF) if Err!=nil Err!=io. Eof{fmt. PRINTLN (err) return}if 0 = = n{break}//Add the Read bytes to the chunks inside chunks
One, what is Xml,xml's purpose?
XML (extensible Markup Language) expands the markup language, which, like HTML, is SGML (Standard generalized Markup Language, Standard Universal Markup Language). XML is a cross-platform, content-dependent technology in an Internet environment and a powerful tool for dealing with structured document information at the moment. Extensible Markup Language XML is a simple data storage language that uses a series of simple tags to describe data that can be built in a
PHP Read Directory Delete (can delete directory files) This article provides a PHP directory management program, he can be in the directory of files, folders, and other files for the management of delete operations, can support the management of an unlimited level of directory OH.
PHP Tutorial
File_object:Process Line3. Writing filesWrite a text fileOutput = open (' Data ', ' W ')Write a binary fileOutput = open (' Data ', ' WB ')Append Write fileOutput = open (' Data ', ' w+ ')Write DataFile_object = open (' Thefile.txt ', ' W ')File_object.write (All_the_text)File_object.close ()Write Multiple linesFile_object.writelines (list_of_text_strings)Note that calling Writelines writes multiple rows at a higher performance than using write one-time writes.When processing log
File_object:Process Line3. Writing filesWrite a text fileOutput = open (' Data ', ' W ')Write a binary fileOutput = open (' Data ', ' WB ')Append Write fileOutput = open (' Data ', ' w+ ')Write DataFile_object = open (' Thefile.txt ', ' W ')File_object.write (All_the_text)File_object.close ()Write Multiple linesFile_object.writelines (list_of_text_strings)Note that calling Writelines writes multiple rows at a higher performance than using write one-time writes.When processing log
Java implementation reads large files by row
String file = "F:" + file.separator + "a.txt";
FileInputStream fis = new FileInputStream (file);
Randomaccessfile RAF = new Randomaccessfile (new file (file), "R");
String s;
while ((S =raf.readline ())!=null) {
System.out.println (s);
}
Raf.close ();
Fis.close ();
The two while versions that are popular on the internet are not reliable.
Consider Bufferedinputstream and Bufferedoutputstream
1. Read the file data from resource raw:""; try{in= Getresources (). Openrawresource (r.raw.test); Get the size of the data in.available (); Byte[length]; //Read data in.read (buffer);" BIG5 "); //Close in.close ();} catch (Exception e) {e.printstacktrace ();} 2. Read the file data from the resource assetFile name string res=""; try{in= Getresources (
How to solve conflicts between concurrent read/write files in php. For applications with low daily IP addresses or a low number of concurrent jobs, do not consider this! There is no problem with the normal file operation method. However, if the concurrency is high, we do not need to consider this if we are reading files for applications with low daily IP addresse
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