precalculus essentials

% Echo%date% Del *%date:~4,10%-5.dmp Exp Nianjin/nianjin file=d:\temp\nianjin%date%.dmp Owner=nianjin As shown in the following: Simplified auto-Export script2. backup file geo-copy script (win copy to Linux) FTP command Script Ftp-n 192.168.226.129 FTP Command Execution content User why 123456 Cd/home/why/ftptest Bin Put Seo.pptx Bye ! The command execution diagram is as follows F

Label: 1 Query Type The query type contains: A full table scan, index scans, range scans, unique index lookups, and constants. Const type: Primary key query is generally const All Type: Full table scan 2 Why to split a join operation Caching can is more efficient; Executing the queries individually can sometimes reduce lock contention; Scale database more easily; Reduce redundant row access; 3 Query states MySQL Query status show full processlist; Sleep, Query, sorting result, Sending data

Mysql-server-5.6.25-1.el6.x86_64File/usr/share/mysql/charsets/cp1250.xml from install of mysql-libs-5.1.71-1.el6.x86_64 conflicts with file from Package mysql-server-5.6.25-1.el6.x86_64File/usr/share/mysql/charsets/cp1256.xml from install of mysql-libs-5.1.71-1.el6.x86_64 conflicts with file from Package mysql-server-5.6.25-1.el6.x86_64File/usr/share/mysql/charsets/cp1257.xml from install of mysql-libs-5.1.71-1.el6.x86_64 conflicts with file from Package mysql-server-5.6.25-1.el6.x86_64File/usr

The first few chapters are expected to be theoretical knowledge. The code involved should also be a small part of what I wanted to do. Let's figure out the theory first. It would be much better to understand shader. So bless Gentlemen Cheng Yunchang Rong. All right. Start recording your study notes 1. What is the rendering pipeline? What is the connection to shader. "The final purpose of the rendering pipeline is to generate or render a two-dimensional texture (2D picture) and display it on our

Tags: select move his apk pat public install start diagram pictureOne, the Vue source code settings1) src in the configuration of the Router model: ' History ' to be removed, that is, the Address bar reserved "#".2) Config's index about build configuration Assetspublicpath: './' attention to add.If the above two items are not set to, then, packaging out of the WebApp is blank, hehe.Second, Hbuilder pack the process of Android1) Open the directory and select the Dist directory generated by NPM ru

Tag: Name error Ken exists for password word success password1. Modify the user nameYou can use the Rename user statement to modify the name of an existing SQL user.Syntax format:Renane USER Old_user to New_user,[, Old_user to New_user] ...Note: Old_user is a SQL user that already exists, New_user is a new SQL user.The RENAME user statement is used to rename the original MySQL account. To use the rename user, you must have the global Create user permission or the MySQL database update permission

. Syntax format:,ROLLBACK [Work] [and [No] CHAIN] [[No] RELEASE]In the preceding example, if you add the following statement at the endRollback work;After executing this statement, the previous delete action is revoked, and the SELECT statement can be used to query whether the row data is restored.4. Rolling back a transactionIn addition to undoing the entire transaction, the user can also use the rollback to statement to roll back a transaction to a point, before which a savepoint needs to be s

Reading notes: Multi-threaded programming Essentials: 1. There are main and working memory points in multiple threads, and in the JVM there is a master memory that is dedicated to all threads sharing data, while each thread has his own private working memory, the main memory and the working memory decibels in the JVM's stack and heap areas. 2. The state of the thread has ' ready ', ' Running ', ' sleeping ', ' Blocked ', and ' waiting ' several states

Root 0 March 7 00:43 15-rw-r--r--1 root root 0 March 7 00:43 16-rw-r--r--1 root root 0 March 7 00:43 17-rw-r--r--1 ro OT Root 0 March 7 00:43 18-rw-r--r--1 root root 0 March 7 00:43 19-rw-r--r--1 root root 0 March 7 00:41 2-rw-r--r--1 ro OT Root 0 March 7 00:43 20-rw-r--r--1 root root 0 March 7 00:41 3-rw-r--r--1 root root 0 March 7 00:41 4-rw-r--r--1 roo T Root 0 March 7 00:41 5-rw-r--r--1 root root 0 March 7 00:41 6-rw-r--r--1 root root 0 March 7 00:41 7-rw-r--r--1 root Root 0 March 7 00:41 8

Tags: nbsp stat state call Match SQL record ant noteIt is important to note that a function is used in an SQL statement because it is possible that each statement will be called, even if each record in the table is called.Pay attention to the conversion, will consume a lot of performance, even the string of encoding different, there will be very large consumptionThe count (*) function of three MyISAM, the number of records will be removed from the table information directly.Conditions for four c

the specified user--delete user drop username--Assign permissions/Add user GRANT permission list on table name to username [identified by [PASSWORD] ' PASSWORD ')-all privileges represents all permissions-* * represents all tables-library names for all libraries. Table name represents a table below a library-view permissions Show GRANTS for user name--View current user rights show GRANTS; or SHOW GRANTS for current_user; or SHOW GRANTS for Current_User (); --Revoke Permissions REVOKE permissio

Make tool without exiting GDB.Next executes a line of source code forward without stepping into other functions.Print expr Displays the value of the expression expr.GDB uses example ************************List an error C source program BUGGING.C code:1 #i nclude23 static char buff [256];4 static char* string;5 int Main ()6 {7 printf ("Please input a string:");8 gets (string);9 printf ("\nyour string is:%s\n", string);10}The above program is very simple, its purpose is to accept the user's inpu

Tags: random number str UTC Apply Select Replace Build server BSP "Time function accurate to nanosecond" Sysdatetime (), sysutcdatetime ()---- accuracy depends on the computer hardware and the Windows version number of the instance that is executing the SQL Server "Generate 10-bit random numbers without repeating" Select Right (1000000000 + convert (bigint,abs (checksum (NEWID ())), 10) "Generate non-recurring IDs for 18-bit pure numbers" Select SUBSTRING (replace (replace (replace (varchar (),

Navicat for SQLite as a more common database management software, a lot of people will use it, but some users know little about it, many points are not very clear. The following is an introduction to the Navicat for SQLite table check knowledge points, check the limit is the most common type of restriction, allowing the specified value in a column must conform to a Boolean (truth) expression.Navicat for SQLiteOn the "Check" tab, simply click the Check field to edit it. Using the Check toolbar, u

directory of root super UserLib 32-bit library fileLIB64 64-bit library fileOpt third-party software installation addressUser Software Installation Addressvar frequently transformed data holds address log storage addressThe mount point of the MNT deviceLost+found didn't have time to save the file, the last strawIv. Catalogue of Proc Proc/cpuinfo CPU InformationCat/proc/cpuinfoLscpu Proc/meminof Memory InformationCat/proc/meminofFree-h: Human Readable language Proc/mounts Mounti

[[emailprotected] test]# ll total dosage 8-rw-r--r--1 root root 554 July 20:37 log.txt-rw-r--r-- 1 root root 598 May 03:59 test.txt[[emailprotected] test]# cat log.txt--2018-07-28 20:37:28--https://mirrors.al Iyun.com/centos/7.5.1804/isos/x86_64/sha256sum.txt parsing host mirrors.aliyun.com (mirrors.aliyun.com) ... 180.163.155.9, 180.163.155.10, 180.163.155.11, ... Connecting mirrors.aliyun.com (mirrors.aliyun.com) |180.163.155.9|:443 ... is connected. An HTTP request has been made and is waitin

information, author information two entity objects. It is also possible for the user to place the two entity object information in the same table. If you can design the table as a book name, book author and so on. However, such a design will bring a lot of trouble to the subsequent maintenance.When a subsequent book is published, the author's information needs to be added to each published book, which will undoubtedly add additional storage space and increase the length of the record. And if th

Microsoft released the anti-virus software Beta version named after Microsoft Security Essentials to customers in the United States, Brazil, Israel, and China on Tuesday. Currently, only the English version is available. I downloaded the version for a while, let's talk about my experiences. First, you must have a live account and pass the genuine verification of the Microsoft operating system. The download process is too cumbersome, it is worth mentio

today, brothers and even education share with you 20 Essentials of PHP programming efficiency：Brother Lian ( www.lampbrother.net) feel using single quotes instead of double quotation marks to contain strings can be faster. Because PHP will search for variables in a string surrounded by double quotes, single quotes will not, note: only echo can do this, it is a string can be used as a parameter of the "function" (in the PHP manual that echo is a langu

Original address: http://developer.51cto.com/art/201111/303492.htmWeb Essentials is the best vs extension tool you've seen so far, so please wait for me one by one.First, install from Extension Manager: The latest version is the 2.5 version released in 19th. Then restart your VS development environment and you'll be able to use the handy features it provides.Web Essentials provides a lot of quick and