In the Web project, JS, CSS Merge compression, not only to reduce the number of HTTP requests, reduce the use of broadband resources, but also effectively manage the introduction of various JS, CSS, so that the whole project more orderly. For access users, the greater benefit is the increase of the page opening speed, greatly improving the user experience.Therefore, the Internet all kinds of web sites, through a variety of means, static files to merge, compression, dynamic separation, using CDN
Emacs uses Multi-termThe multi-term in Emacs is equivalent to the iterm under the Mac and is a very useful terminal under Emacs.Load Multi-term.el FileEmacs uses Multi-term as terminal, the first place to put Multi-term.el files in your Emacs Load-path.Configuration;;-------------------------------- ---------------------------- ; set Multi-term ;;------------------------------------------------------------
, but can be changed. No matter what character (except newline, backslash), as soon as the S command is followed, a new string delimiter is formed.6.4 E option-E is an edit command that is used in cases where SED performs multiple editing tasks. All edit actions are applied to the line in the pattern buffer before the next line begins editing.Sed-e ' 1,10d '-e ' s/my/your/g ' datafile#选项-E is used for multiple edits. The first edit deletes the 第1-3 line. The second editor replaces all occurrence
/download/win after the download installation is complete, click on the Start menu-"Git folder-" Git Bash will appear below the command line form, prove that you installed successfully.2. Set your name and email, your name and email will appear in your submission record.git config--global user.name "your name"git config--global user.email "your email"Note: When git config uses the--system parameter, git reads and writes the/etc/gitconfig file that con
A memory leak is something new. Without delete, we can: the person who creates the dynamic object uses new to create the object, and the person who uses the object is responsible for freeing the memory block.For example: I share a message queue with others, others put the message (new out of the object) in the message queue, he is not responsible for the release; I get a message from the message queue and o
Raspberry Pi uses python+pyserial to realize serial communicationExt.: http://blog.csdn.net/homeway999/article/details/8642353Directory (?) [+]
Raspberry Pi uses pythonpyserial to realize serial communication
Raspberry Pi End Mount Pyserial
Method 1source Installation
Method 2pip Installation
Raspberry PI Terminal connection serial port
Windows Port connection serial p
Linux uses FIO to test disk IOPS 2013-09-23 10:59:21Category: LINUXFio is a great tool for testing IOPS, which is used for stress testing and validation of hardware, supporting 13 different I/O engines, including: Sync,mmap, Libaio, Posixaio, SG v3, splice, NULL, network, Syslet, Guasi, Solarisaio and so on.FIO website Address: http://freshmeat.net/projects/fio/One, FIO installationwget http://brick.kernel.dk/snaps/fio-2.0.7.tar.gzYum Install Libaio-d
components in a lower proportion of PCA dimensionality, it uses a number of random algorithms to accelerate SVD.
Full is the traditional SVD, using the corresponding implementation of the SCIPY library.
Arpack and randomized similar to the applicable scenario, the difference is that randomized uses scikit-learn own SVD implementation, and Arpack directly u
The Web page code is translated into the website page encoding, which is a library that specifies its specific character encoding format in a Web page. GBK is the standard of GB2312 compatible GB2312 on the basis of national standard. The text encoding of the GBK is expressed in double-byte notation, that is, both Chinese and English characters are represented by double-byte, in order to distinguish the language, the highest bit is set to 1.GBK contains all Chinese characters, is the country cod
This article mainly introduced Python uses the XLRD implementation to retrieve Excel in a column contains the specified string record the method, involves Python uses the XLRD module to retrieve Excel's skill, very has the practical value, needs the friend to be possible to refer to under
This article illustrates how Python uses the XLRD implementation to retrie
to be scanned to refer to the shared library. All the referenced references in the program take effect immediately, and the corresponding libraries are mapped to the program.
Steps 3rd and 4th are the secrets of shared libraries.
Now, let's start with a simple example.
Foo.h:
Copy Code code as follows:
#ifndef foo_h__
#define Foo_h__
extern void foo (void);
#endif//foo_h__
FOO.C:
Copy Code code as follows:
#include
void foo (void)
{
Puts (
files to reach the maximum limit faster than data files.
· For BDB tables, it stores data and index values in the same file, and adding indexes causes the table to reach the maximum file limit faster.
· All tables allocated in InnoDB shared table spaces compete for the same common space pool, so adding indexes can deplete storage in the tablespace more quickly. However, unlike the files used by the MyISAM and BDB tables, the InnoDB shared tablespace is not limited by the operating system's fi
also the code that PHP uses the P3P protocol:
Header (' p3p:cp= "cura ADMa DEVa Psao psdo We bus UNI PUR INT DEM STA PRE COM NAV OTC NOI DSP COR"];
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Preface
The content of this article is from the Hadoop veterans (and also the chief architect of Cloudera) Doug cutting a share of how the company uses open source software to enhance the business value of the company. It shares a lot of content related to the company and open source, this article makes a brief summary and summary (first person narration). The original is pure English, interested students, click this link to read: How Cloudera
of the data file, that is, by applying an incremental backup to the image replica to roll forward (restore) The image copy to a specified point in time.The image copy is updated with all the changes that were before the SCN when the incremental backup was performed.RMAN uses the updated data files obtained in media recovery, as with the full image copy obtained in the SCN, so there is no overhead required to create a full-image copy of the database o
operating systems Sqlnet.authentication_ The values for services are somewhat different, and we usually use some of the following settings:
Sqlnet. Authentication_services = (All)
For Linux systems, OS authentication and password file authentication are supported.For Windows systems, the actual experiment is not supported by this parameter, and validation fails.
Sqlnet. Authentication_services = (NTS)
This setting value is only for Windows NT systems, which supports
virtual address for the new processSpace and load the code and data of the executable file or any necessary d l files into the address space of the process.The system then creates a thread kernel object for the main thread of the new process (which uses a count of 1). Like the process kernel objects, thread kernel objects are small data structures that the operating system uses to manage threads. By execut
Php uses the session_set_save_handler () function to save the session to the MySQL database. Php uses the session_set_save_handler () function to save the session to the MySQL database. by default, PHP saves the session by using the file method, this is only a small file space overhead. php uses the session_set_save_handler () function to save the session to the
RMAN uses backup to transmit tablespaces
The method for creating a tablespace set in the Oracle Database Management Manual requires that the tablespace transmitted during the execution of tablespace transfer should be opened in read-only mode. In contrast, when RMAN uses backup to create a tablespace for transmission, it does not need to access the online data files of the tablespace to be transmitted. This
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