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operation. 2) backing up the Mysqla database mysqldump--uroot-p--single-transaction--opt--events--triggers--routine s--flush-logs--master-data=2--databases db1 DB2 >db.sql--flush-logs: Option to generate a new binary log file (scrolls the binary file so that it starts in a full position) --mater-data : the option value equals 2, and the change master statement in the backed-up SQL file is commented. --single-transaction:innodb table when backing up, the option--single-transaction is usually

SELECT * FROM (select RowNum rn,e2.* from (select e1.* from EMP E1) E2 where rownumSELECT * FROM (select RowNum en,e.* from emp e)Select E.deptno,e.ename,d.dname,e.mgr,s.gradeFrom (select AVG (SAL) ea from emp) e1,emp E,salgrade s,dept Dwhere E.deptno=e.mgrand D.deptno=e.deptnoand e.sal>e1.ea;--Copy table dataCREATE TABLE Emps as SELECT * from EMP;--View Table contentsDESC EMP;Select table_name from all_tables where Owner=upper (' Legend ');--Copy table structureCREATE TABLE Empnew as SELECT * f

Tags: style yum str enter DIV inux BSP Body dbaThe linuxoracle of Evil and supplementary articlesLinux simultaneously Open two terminals:ctrl+shift+tLinux configuration Yum file:/etc/yum.repos.d/xx.repoLinux switch users:su-usernameOracle Connectivity:sqlplus/as sysdba;conn/as sysdba;Grid to view the status of the database, the target of the database ORCL is ofline How to start for online:Srvctl Enable database-d ORCLSrvctl Start database-d ORCL"Linuxoracle" linuxoracle the Evil

mytable from Database mydb to the E:\MySQL\mytable.sql file. c:\> mysqldump-h localhost-u root-p mydb mytable>e:\mysql\mytable.sql Example 3: Export the structure of the database mydb to a e:\MySQL\mydb_stru.sql file. c:\> mysqldump-h localhost-u root-p mydb--add-drop-table >e:\mysql\mydb_stru.sql Note :-h localhost can be omitted, it is generally used on the virtual host.3) Export data structure onlyformat : mysqldump-u [Database user name]-p-t [the name of the data

--range-> select * from TB1 where name Gt 'Alex'Special: If the primary key or index is an integer type, then the index select * from TB1 where nid > 123 select * from TB1 where num > 123- Order BY Select e-mail from tb1 order by name Desc; When sorting by index, the selected mappings are not indexed if they are not indexes: if the primary key is sorted, then the index: SELECT * from Tb1 ORDER by nid desc; -Combined index leftmost prefix if the combined index is: (name,email)

Multi-table query mysql support is SQL99 standard connection query, does not support Oracle Company's external connection query, but supports Oracle equivalent query, not equivalent query, self-connection query, subquery (as long as it is not an outer join ( + ) are supported) Oracle also supports SQL99 standard connection queries Internal Connection--equivalent QuerySelectE.empno,e.ename,e.sal,d.dname fromEMP Einner Join dept Don E.deptno=D.deptno;--To put it simply: replace the comma in the

Back to Catalogmultipleactiveresultsets can make the database connection reusable, but when you're on the Moebius cluster tool, this option doesn't turn on (false by default), and when you use an ORM tool like EF, This option will be added by default, it is to improve the performance of the program, the advantage is that the database connection resources are exhausted, the use of the method is simple, only need to add it to the data connection string.For example: server= (local); Integrated Secu

Label:Previously there was a replica set to build mongodb3.0, but the admin database that was used directly was the root of the user. Links: http://blog.csdn.net/tuzongxun/article/details/51723259Recently you want to move data to a non-admin database, and then re-create the user in the non-admin library, the process is roughly the same as before, but there are some problems when creating the user, mainly on the user roles and permissions. I built the process to refer to the following user rights

(sysdate, ' D ') from dual; 5 March 14, 2002 for Monday DY Week the first day abbreviation Select to_char (sysdate, ' DY ') from dual; SUN March 24, 2002 for Sunday HH or HH12 12 input hours Select to_char (sysdate, ' HH ') from dual; 02 Midnight 2 O'Clock 8 02 HH24 24-hour Select to_char (sysdate, ' HH24 ') from dual; 14 2:08 P.M. to 14 MI minutes (0~59) Select to_char (sysdate, ' MI ') from dual; 17 4:17 P.M. SS seconds (0~59) Select to_char (sysdate, ' SS ') from dual; 22 11 points 3 minutes

KB memfree:1722092 KB buffers:25796 KB cached:52816 KB [[email protected] ~]# FREE–H display memory information human identifiableTotal used free shared buffers Cachedmem:1.8g 180M 1.6G 224K 25M 51M-/+ buffers/cache:103m 1.7Gswap:767m 0B 767M4.1.3 Viewing mount Information[Email protected] ~]# column-t/proc/mountsRootfs/rootfs RW 0 0PROC/PROC proc Rw,relatime 0 0Sysfs/sys Sysfs rw,relatime 0 0Devtmpfs/dev Devtmpfs rw,relatime,size=938496k,nr_inodes=234624,mode=755 0 0Devpts/dev/pts devpts rw

/archive/2010/12/20/imcp.htmlSummarizeA nosql-supplemented architecture is centered on the idea of MySQL architecture, and it's just that the previous architectures have assisted in adding nosql to improve performance and scalability. This architecture is relatively easy to implement, but it can achieve good results. Hopefully this article will help you if you're trying to introduce NoSQL into your project, or if your MySQL-based system is currently having a bottleneck associated with it.

Label:These two days did the import and export table data for Oracle. 1.oracle provides three ways to import and export files, (1) Oracle Export/import (2) SLQ export/import (3) PL/SQL Export Import The second method is suitable for import and export of single or several tables, and the amount of data exported is smaller. If it is a large amount of data or a table is more, it is best to use the first method. The third method must have PL/SQL. 2. Precautions (1) When exporting a table, the second

1. File path: advanced/console/migrations/m130524_201442_init.php 2, add the point: Increase the constraint "username" "Email" Authentication uniqueness: Original code: Supplemental Code: "Yii2.0.4" Supplement to database migration migration in advanced templates

China Telecom once again showed its strong interest in WiMAX at the global WiMAX summit held yesterday on August 18. Zhao ye, China Telecom's technology department, said WiMAX has independent target networking capabilities and is a good supplement to fixed networks. At the beginning of this year, China Telecom officially became a member of the WiMAX Forum. Zhao ye revealed that it was originally an independent target Networking capability of China Te

have been tangled up about the first content in the previous essay, after all, the message is the first content is very important, before also introduced, hesitated for a long time, feel to write a supplement, forgive me a little obsessive-compulsive disorder ...Previously written about the header of the message Portal:Message header:http://www.cnblogs.com/imyalost/p/5708445.htmlGeneral header field:http://www.cnblogs.com/imyalost/p/5717430.htmlReques

body will produce a lot of lactic acid, then you will feel tired. Therefore, you need to supplement sugar during exercise or before to delay fatigue. If you do not make sugar supplements in time after exercise and do not allow muscle sugar to recover immediately, your next training goal will not work properly. Therefore, athletes are expected to delay fatigue and quickly recover after exercise to participate in the next stage of training. The nutriti

Label:PS: Wuyi still want to learn ... Though it's a bit hard. But the road is their own choice, then they will persist to go on ... Learning content: 1. Database Lookup Supplement ... Find more things involved, not fully covered in the previous section ... We also take the pet form as an example , here to supplement .... Pattern matching: The so-called pattern matching, is simply to follow a pattern to fin

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Tags: mysql database centos shellThe source of this article: http://blog.csdn.net/u012377333/article/details/47006087 After the introduction of the CentOS-based MySQL learning Supplement two-using the shell to create a database, this article continues to explore the use of shell and MySQL together, I don't know how to quickly create a well-designed database table and add the appropriate basic data after a database design is complete, what I now know i

(Transferred from: http://wenku.baidu.com/view/af39b3164431b90d6c85c72f.html)The fourth day of Android Learning to supplement--android's common controlsFamiliar with the use of several commonly used Android control methods:One, Radiogroup and radiobutton--radio buttonsSecond, checkbox--check boxThree, toast--prompt box, will automatically disappearIv. progressbar--progress Bar ToolV. listview--display the control as a listHere is a detailed explanatio