zfs meaning

"One: The meaning of the MySQL query plan output column:1.id: The identification of each operation performed independently, indicating the order in which the objects are manipulated, the larger the ID value, the first execution, and, if the same, the order of execution from top to bottom.2.select_type: The type of each SELECT clause in the query.3.table: Name, the name of the object being manipulated, usually the table name, but there are other format

Tags: instance database index meaning transactionsIn the learning database, often hear "transaction" "Index" "instance" and other terms, then what exactly do they mean?TransactionTransaction: Refers to a complete operating procedure. This process will be rolled back if there is an "accident" at any one of these steps. Transactions are often used by databases in banks.For example, if User a transfers 100 dollars to User B, then the transaction needs to

Tags: DLL space media mnt modules character Device Inux grub dynamicJanuary 10, 2017, Tuesday the meaning of the Linux file system _ each Rootfs: Root file systemFhs:linux/boot: System boot related files, such as kernel, INITRD, and Grub (bootloader)/dev: Device filesDevice files:Block devices: Random access, data blocksCharacter Devices: Linear access, by characterDevice number: Main device number (major) and secondary device number (minor)/etc: Prof

Tags: number let [email protected] syn ber guide div lsp harExcerpt from: Abs_guide: http://www.tldp.org/LDP/abs/abs-guide.pdf The meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained:Variable Description:$$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such

Tags: SPL enc meaning Lisp encoder htm convenient ice astEnter Gedit in the terminal to open the file editor in the attachment, enter GED before you can tab out all.In the terminal, enter Firefox to open the attachment in Firefox, enter firef before you can tab out all.Enter "Nautilus directory" in terminal to open the folder window under the specified directory.In the terminal, enter "evince/home/weis/desktop/bird's Linux Private cuisine _ Basic Lear

Label:[Client]Port = 3306Socket =/tmp/mysql.sock [Mysqld]Port = 3306Socket =/tmp/mysql.sock Basedir =/usr/local/mysqlDataDir =/data/mysqlPid-file =/data/mysql/mysql.piduser = MySQLBind-address = 0.0.0.0Server-id = 1 #表示是本机的序号为1, which is generally the meaning of master Skip-name-resolve# Disable MySQL for DNS resolution of external connections and use this option to eliminate the time for DNS resolution for MySQL. But be aware that if you turn on this

The meaning of Hibernate's generator attributeThis article describes the meaning of Hibernate's generator attribute.The generator attribute has 7 classes, and this article briefly describes the meaning and usage of these 7 classes.Hibernate's Generator attribute has 7 classes, this article briefly describes the meaning

The meaning of living out of lifeMisery itself is meaningless, but we can give it meaning through our own response to suffering.From this book, from the Frankel of life in Auschwitz, I learned that the ultimate freedom of humanity is the freedom to choose one's attitude and way of life in any situation!I also think of "Xiangtalan" in a paragraph: "Even if the shackles of the body, a blood-stained, isolated

The basic metacharacter set of the Regular Expression and Its Meaning (lower). The character set of the regular expression. Pattern \ {n \} Used to match the occurrence times of the previous pattern. N is the number of times All tools Pattern \ {n, \} m The meaning is the same as above, but the minimum number of times is n. All tools Pattern \ {n, m

Today to share with you what is the key word. Mainly divided into 5 parts, including: Why is called the keyword, the keyword itself is how to come to the name, and then talk about the relationship between keywords and search engines, keyword classification of what, when the best time to implant keywords, the pros and cons of keywords. First let's look at what is called the keyword. The source of this name of the key words we first learn from a number of knowledge encyclopedia. The Chinese name

The meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained:Variable Description:$$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output all parameters.[Email protected]All parameter lists. such as "[email protected

As a bridge between Java and database, JDBC is one of the foundation of Javaweb background, which needs us to be familiar with its principle and usage. JDBC General steps for using are: 1, the use of reflection loading driver, such as Class.forName ("Com.mysql.jdbc.Driver"); 2, access to the database connection objects, such as Java.sql.Connection conn = Drivermanager.getconnection (Url,user,password); 3, create statement objects or PreparedStatement objects, such as PreparedStatement ptmt=conn.

, "* * * * ..., is the Chinese people forwarding".) I am not the Chinese and not this text message, I just do not forward, do not waste 0.1 yuan, this message can make me how. I'd be a blue-eyed Yankee. So I don't think this kind of commentary makes any sense. ） Now to talk about my point of view, in fact, a word can refute the views of the forum. As we all know, the person who is not adaptable is to be eliminated after all. So I would like to ask the question is, since the C language outda

The information that can be understood is the useful information, this is the meaning of inforgraphics. What is infographics, simply, is the visualization of complex data, the real meaning of infographics is through the visualization of graphics, display the data contained in the things, its trend, distribution, its hidden meaning, or simple data beauty. The o

(Baidu Spider) visits this website regularly every day. Baidu snapshot of the timely update marks Baidu's attention to this site-Baidu snapshot back or behind the current time period is too long is down right. Google's exit in China, Google's increasingly weak PR today, Baidu Snapshot (Baidu snapshot of the update time) more and more become a webmaster Tangled Baidu SEO index, and even became the webmaster Exchange links when the important reference indicators, Baidu Snapshot update not in a t

value 1000000 is displayed, The specified width "(4)" has been exceeded, so it is output as-is. When using integer types in MySQL data types (tinyint, smallint, mediumint, Int/integer, bigint), there is no point in adding a "(M)" to the data type after the non-special requirements. Add the data type below 1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) sma

Shell_05 variable name, meaning variable name meaning $ n the nth domain of the current record, number of ARGC command line parameters for all fields recorded by FS $0 in the ARGIND command line (start with 0) array of ARGV command line parameters CONVFMT digital conversion format ENV... shell_05 variable name, meaning variable name

What is the true meaning of "I want to learn programming "? There are two important things about programming education:1. most people do not really want to learn code.2. learning code is not just about writing code.What-people-really-mean-when-they-say-I-want-to-learn-to-codeIf you do not know the above two things, the way you learn code is wrong, and you will never learn to write code.The first point is that if you do not really want to lear

To tell the truth, "div+css" This word does not know how many people harm, perhaps the intention of its proposed is not wrong, but the followers from the performance of the distorted meaning, that the entire page should be a combination of div+css files. In this way, there is no visual impact, because the previous design of the page is restored, but if the HTML document to the machine (such as spiders) to analyze, it may not be able to find the focus,

A few days ago a friend in the group asked Clear:left meaning, I thought is simple to clear the floating problem, let him Baidu "clear floating", leading to a little misunderstanding in the middle. Later I followed his demo and found that I did not fully understand the meaning of clear:left and clear:right. Special Read the following manual, and wrote a few demos, after the group of other people to guide, s