Programmer Group

What is a benchmark When we optimize the database, we only know if the optimization is effective by measuring the performance of the system. This measurement is benchmarking.Benchmark tests are defined as follows: Benchmarking is the activity of measuring and evaluating software performance indicators to establish a performance benchmark at a ...

I think DBCP is a little more complex than c3p0, but DBCP also has a certain share of use, so I recommend learning it To establish a DBCP connection pool: 1. Import jar package (DBCP needs more jars, four) Don't mention the jar package for operating the database, as mentioned in the last blog commons-dbcp2-2.5.0.jar and com ...

I. actual purpose Use all kinds of functions to operate data, and master the functions and use methods of all kinds of functions. II. Actual operation process 1 use the math function RAND() to generate 3 random integers within 10. The random number generated by the RAND() function is between 0 an ...

concept Similar to the java method, a group of logic statements are encapsulated in the method body to expose the method name; Benefits: 1. Hidden implementation details 2. Improve code reuse Call: select function name (argument list) [from table]; Characteristic: ① What is the name (function name) ② ...

Mycat currently does not fully support versions of MySQL 8 or above, which may cause problems such as incorrect passwords when Mycat connects to MySQL 8 because the new version does not encrypt the password the same way as the old version.There is also the time zone issue, and the new version of the connection requires additional time zone par ...

1. Create keystone database and authorize [root@controller ~]# mysql -uroot CREATE DATABASE keystone; GRANT ALL PRIVILEGES ON keystone.* TO 'keystone'@'localhost' IDENTIFIED BY 'KEYSTONE_DBPASS'; GRANT ALL PRIVILEGES ON keystone.* TO 'keystone'@'%' IDENTIFIED BY 'KEYSTONE_DBPASS'; 2. Install ke ...

Docker installs the latest version of Mysql (Mysql8.0) Docker environment configuration Mysql8.0 configuration Note: Note 1 Note 2 Last Congratulations, docker MySQL has been built successfully! If you think the writing is good, please click below to give a reward, thank you!! Original: product R ...

WNMP environment building steps Installation of three major parts Nginx installation PHP installation MySQL installation Three piece configuration Nginx configuration PHP configuration MySQL configuration Three piece joint commissioning PHP connection Nginx PHP connection to MySQL Common script ...

Catalog 1 define data structure by mapping of es Default data type of Es The mapping structure of es is defined as follows 2 import Jest dependency 3. Import mysql data for es Configure application.properties Define the java class corresponding to es data structure Insert mysql data into es ...

Preface MySQL backup generally uses full library backup plus log backup. Depending on business needs, you can use full backup at 1 a.m. every Sunday and incremental backup every hour to recover the most complete data when MySQL fails. 1. Bilog Log Recovery MySQL's binary logs record all additions and deletions to the database (provided you hav ...