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-- config-file =/etc/my. cnf start 1 only starts the first mysql service. set mysql1 in cnf. Db-app: // #/usr/local/mysq/bin/mysqld_multi -- config-file =/etc/my. cnf stop 1 start and end the first mysql Service Db-app: // #/usr/local/mysq/bin/mysqld_multi -- config-file =/etc/my. cnf start 1-4, start the 1st-4 MySQL service, which is actually all here. Db-app: // #/usr/local/mysq/bin/mysqld_multi -- config-file =/etc/my. cnf report 1-4 View startup: Db-app:/# ps aux Root 10467 0.0 0.2 2712

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means that the group mysqld10 is in the group mysqld13. You can specify multiple groups or group ranges in the command line and separate them with commas. Blank characters (such as spaces or tabs) are not allowed. parameters after blank characters are ignored. (Note: the GNR value is the value defined in mysqld # In my. cnf. I only have 1-4 here ). Db-app: // #/usr/local/mysq/bin/mysqld_multi -- config-file =/etc/my. cnf start 1 only starts the first mysql service. set mysql1 in cnf. Db-ap

Replace variables Replace variables can be seen as placeholders. Single Symbol replacement the most basic and common form of element replacement in SQL statements is single Symbol replacement. Symbol is used to specify the replacement variable symbol in the statement. When the statement is executed, the Oracle server processes the statement and finds that the variable is replaced, and tries to use one of the following two methods to parse the value of the variable. First, it checks whether th

is the specific department, the total number of employees of a specific type of work in a specific year, sum_sal is the sum of the salaries of employees hired in a specific department, type, or year. 2> View data is as follows: SQL> select * from emp_view; DEPTNO JOB HIRE CNT SUM_SAL---------- --------- ---- ---------- ---------- 20 CLERK 1980 1 800 20 ANALYST 1981 1 3000 20 ANALYST 1987 1 3000

The so-called atomic weight is the operation of the variable is "atom", the operation can not be divided, so it is thread-safe. Why use atomic variables because multiple threads can also cause problems with a single variable operation. Before Java5, you can solve the security problems of concurrent access by volatile, synchronized keywords, but this is too cumbersome. JAVA5 provides a toolkit java.util.concurrent.atomic for single variable multithreaded concurrency security access, and the cla

set operators--Generates an EMP table with the same structure for the set operation generation environment, named EMP2Idle> select * from EMP; EMPNO ename JOB MGR hiredate SAL commdeptno----------------------------------------------------- --------------------------7369 SMITH clerk 7902 1980-12-17 7499 ALLEN salesman 7698 1981-02-20 1600300 7521 WARD salesman 7698 1981-02-22 1250500 7566 JONES MANAGER 7839 1981-04-02 2975 7654 MARTIN salesman 7698 1981-09-28 1250 1400 30 769

Download Phpexcel (https://github.com/PHPOffice/PHPExcel)Unzip the downloaded zip package to./thinkphp/library/vendorOne, import Excel dataController custom, here with IndexController.class.php Output: Array (1 = = Array (' a ' = ' = ' branch name ', ' B ' + = ' name ', ' C ' + = ' amount '), 2 = = Array (' a ' = = ' A branch ', ' b ' = ' Juanjuan Zhao ', ' c ' and ' = 1100, ' 3 ' + ' array (' a ' = ' B ' branch ', ' b ' = ' = ' Kongjian ', ' c ' = = 1100,), 4 = = Array (' a ' = = ' C branch '

starts the first mysql service. set mysql1 in cnf. #/Usr/local/mysq/bin/mysqld_multi-config-file =/etc/my. cnf stop 1 start and end the first mysql Service #/Usr/local/mysq/bin/mysqld_multi-config-file =/etc/my. cnf start 1-4. start the 1st-4mysql service, which is actually all about me here. #/Usr/local/mysq/bin/mysqld_multi-config-file =/etc/my. cnf report 1-4 View startup: # Ps aux Root 10467 0.0 0.2 2712 1300 pts/0 S/bin/sh/usr/local/mysql/bin/my

: // #/usr/local/mysq/bin/mysqld_multi -- config-file =/etc/my. cnf report 1-4 View startup: Db-app:/# ps aux Root 10467 0.0 0.2 2712 1300 pts/0 S/bin/sh/usr/local/mysql/bin/mysqld_safe -- port = 3306 -- socket =/tmp/mysql. sock1Root 10475 0.0 0.2 2712 1300 pts/0 S/bin/sh/usr/local/mysql/bin/mysqld_safe -- port = 3307 -- socket =/tmp/mysql. sock2Root 10482 0.0 0.2 2716