The size of mysql20W data is 1 GB and the like is very slow. how can this problem be solved. $ SQL = SELECT * 'FROM 'text' where 'title' LIKE' % bbd % 'limit0, 10 nbsp; $ SQL = mysql_query ($ SQL ); in this case, if we want to calculate the size of 20 W li mysql data in 1 GB within 1 second, we can use like to solve this problem.
$ SQL = SELECT * 'FROM 'text' where 'title' LIKE' % bbd % 'limit
$ SQL = mysq
Yesterday I need to change a GB-coded web application to UTF-8 encoding, the entire web program involves more than 300 ASP and HTML files .... So, I searched the internet to convert the GB files into UTF-8 code in batches. Looking for it, there are mostly vbs, JS, or PHP scripts that can only be encoded in real time on the webpage, but there is no tool for converting a large number of files.
Due to time co
The json function added by php5.2 is very popular, but it has been tested and found that,Json_encode is problematic in processing Chinese characters,1. Cannot process the GB encoding. All the GB encoding will be replaced with null characters.2. UTF-8 encoded Chinese characters are encoded as unicode, which is equivalent to the processing result of the javascript escape function.Copy codeThe Code is as follo
If, when you install Oracle 10 Gb in red-flag Linux DC 5.0, all Chinese characters inserted are question marks, do you feel a headache? You don't need to worry about the specific solution to the problem. I hope you will be helpful after browsing.
The following is a list of parameters from select * from nls_database_parameters. The value of NLS_CHARACTERSET is WE8ISO8859P1, and the Chinese characters of INSERT are garbled. Then, use sys to change it to
I am a crazy fan of Oracle 10g manual database creation. I like Oracle 10g manual database creation very much. The following content is my summary, if you are a crazy fan of Oracle 10 Gb manual database creation, I believe the following articles will help you.
1. Create a directory
mkdird:\oracle\product\10.1.0\database
mkdire:\oracle\admin\Ora10g\bdump
mkdire:\oracle\admin\Ora10g\cdump
mkdire:\oracle\admin\Ora10g\create
mkdire:\oracl
Storage capacity: The maximum number of data that can be stored on the storage device, typically in kilobytes (KB kilobyte), megabytes (MB megabyte), gigabytes (GB, gigabyte), Byte (TB, terabyte), and Pb (Petabyte), EB ( Exabyte), etc. to measure.
1kb=2 (b=1024b); The number in parentheses is the index of 2 (that is, how many times)
1mb=2 (a) kb=1024kb=2 (a) B;
1gb=2 (mb=1024mb=2) B.
1tb=2 (a) gb=1024gb
Theoretically 1TB equals 1024GB, and 1GB is equal to 1024MB. In this way, for example, 1 MP3 song file is 4MB size, then store 250 songs is up to 1GB, then if you need to keep the 1TB mp3 song file, is 250*1024, this number believe that we all understand. If you count the number of High-definition TV dramas to calculate, an average of 1 high-definition uncompressed video size of 1GB, if the 1GB video size to calculate, then can also store 1024 high-definition video files. Can you keep so many vi
encode|js| Pinyin
Often written in VB Urlencoding is easy to achieve urlencode, as well as the usehttp://www.csdn.net/Develop/read_article.asp?id=13846The code in can easily be rewritten as a VBS to achieve the pinyin of some Chinese characters
But because some people need to write completely in JavaScript, JavaScript defaults to UnicodeSo you need a Unicode and GB conversion library.
Unicode and GB convers
result of the ip2addr function can only be dynamically converted.
There are at least four methods for dynamic conversion of GB-> UTF-8 encoding:
Extended conversion using php iconv
Extended conversion using PHP mb_string
Use swap table conversion, swap table stored in MySQL database
Convert tables with swap tables and store them in text files.
The first two methods can be used only when the server has made corresponding settings (the corresponding e
Json_encode is a problem in processing Chinese characters and cannot process GB encoding. all the GB encoding will be replaced with null characters. Below is a good solution, you can refer to the new json function in php5.2, which is very popular. However, after testing, we found that,
Json_encode is problematic in processing Chinese characters,
1. cannot process the GB
This is a creation in
Article, where the information may have evolved or changed.
In April I gave a presentation to the GDG Berlin Meetup Group (slides, video) discussing my views on reproducible Bui LDS using the Go programming language.
Image Credit, Nate Finch
As part of this presentation I demonstrated a replacement build tool that I had been developing, GB.
From the feedback I received after the meetup it is clear that many people understood and
The problem is as follows:In 12c, we tested two cases:The first is to add hint, so that the 12c execution plan is similar to 10 GB, but because of the 12c nlj_batching, a nestloop is added. However, the execution plan is essentially the same, and the index S_CONTACT_X_U1 returns the table query.The second is to use 10g outline hint, OFE = 10g, and the execution plan is exactly the same.However, we found that, no matter which case in 12c, the index PA_
Linux supports the maximum file size (can I support files larger than 4 GB )?
Data files created on Oracle (Linux)Can I support files larger than 4 GB?
A:In Linux, there are very few such stupid restrictions on file systems, but any file system is limited.
The following is an incomplete small list:
NTFS (Windows): supports up to 2 TB of partitions and 2 TB of files.Fat16 (Windows): supports a maximu
The previous article describes how to use bitmap to sort non-duplicate data. The Sorting Algorithm is ready at a moment. I want to test the big data, because small data is quickly ranked in the memory.
I. dataset generation requirements
1. The data is an integer in the range of 0--2147483647 (2 ^ 31-1;
2. The dataset contains an integer ranging from 0 to 2 ^ 31-1 of 60%, that is, the number of kicked 40%;
3. No duplicate data in the dataset, that is, the two numbers are not equal;
4. The generat
As the price of physical memory continues to decline, MB or even 1 GB memory has become the standard for installation. The increase in memory capacity has significantly improved the system performance. However, some people have suggested that: when the memory exceeds 1 GB, you do not need to set the virtual memory. You can disable it to save hard disk space. Is that true?
What is virtual memory?
The virtual
Today, many problems occurred when I opened Ubuntu Linux under VMware. Because I modified a lot of configurations, I found that there were too many memory allocations.
I allocated 4G memory to it, but it cannot be used in xwindows. Only the character interface can be entered.
My environment is Windows 64-bit. The host has 8 GB of memory. Intel e8200 CPU. VMware Workstation 8.02 is installed on it. The official original version is installed. Do not t
Previously we introduced:Oracle 10 Gb Memory StructureThis article describes the knowledge and usage of the Sharing pool, including:Program global Zone,Sorting area,Java poolAnd so on. Next we will introduce this part.
Program global Zone
The global area of the program is the memory area that contains data and control information of a single user or server. The global area of the program is automatically allocated by oracle when a user process connect
You are often confused about the invisible indexes of Oracle 11 GB. Is the index really helpful for user queries? It may be helpful for one query, but it may affect 10 other queries. The index will certainly have a negative impact on the INSERT statement, and will also perform potential deletion and update operations, depending on whether the WHERE condition includes this column in the index. A related question is, if the index is deleted, what will a
32 GB server memory configuration, my. the cnf parameter is estimated to be 32 GB memory, for mysql server configuration parameter changes, it is recommended that innodb_file_per_table = 1 open the independent tablespace back_log = 300 # back_log is the number of connections that the operating system can maintain in the listening queue max_connections = 8000 # number of simultaneous sessions allowed by the
The first of the three major paradigms of database design is that the independent table structure must have a unique primary key to identify the table data. in the past, Microsoft's SQL Server (duo version) platform. manually encode the primary key of the table. setting it as an auto-increment column is extremely simple. the encoding is as follows:
-- The simple primary key is defined as follows and set to auto-increment (only the primary key definition is retrieved)
Typeid int not null primary
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