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DBV(DBVERIFY) is a command-line tool provided by Oracle, which can check the consistency of data files both physically and logically. However, this tool does not check the matching relationship between index records and data records, which must be checked using the analysis validate structure command.This tool has the following characteristics: ...

There are two data tables emp and dept as follows: Employee Information Sheet: emp Departmental table: dept Table field description: Data to be inserted in two tables emp Table: INSERT INTO emp VALUES(7369,'SMITH','CLERK',7902,'1980-12-17',800,NULL,20); INSERT INTO emp VALUES(7499,'ALLEN','SALESMAN',7698,'1981-02-20',1600,300, ...

 Summary The full name of RAC is Real Application Clusters, translated as "Real-time Application Clusters" in Chinese, is a solution provided by ORACLE Oracle to build a high-availability database system on low-cost servers. It is free to deploy and can achieve multi-node load balancing and failover functions without purchas ...

Today, learning about database connection pool, we found that C3P0 needs to import the following two jar packages. Otherwise, it will make a mistake. A download link to the jar package is attached here. c3p0 download link By the way, learn how to use c3p0 connection pool. First of all, we need to know why we need to use connection pool: be ...

1. Examples Let's start with an example: @Override public String toString() { return "xxxxx"; } The purpose of @Override is to tell the compiler that this method rewrites the method of the parent class. If the compiler finds that there is no such method in the parent class, it will make an error. Find the implementation of @Override pack ...

1. Determine if there is an injection point ' ; and 1=1 and 1=2 2. The name of a table in general is admin admin user user pass password, etc.. and 0<>(select count(*) from *) and 0<>(select count(*) from admin) ---Judging whether there is admin This table 3. Guess the number of accounts If you encounter 0<Return to ...

General steps for optimizing sql statements Know how often various commands are executed by the show status command mysql> show status like "%com%"; +-----------------------------+-------+ | Variable_name | Value | +-----------------------------+-------+ | Com_admin_commands | 0 | | Com_assign_to_keycache ...

Black Bear looked up the data related to the lower interface test on the internet, mostly in the form of data-driven, and maintained the use cases in text or tables without explaining how to generate the desired use cases. Questions: When testing interfaces, such as parameters a, b, c, I want to test a parameter first, there are (no transmissio ...

To configure For login systems, we will use extensions, Flask-Login. The configuration is as follows (file app/init.py): from flask_login import LoginManager lm = LoginManager() lm.init_app(app) Reconstructing User Model Flask-Login extensions require specific methods to be implemented in our User class. But how classes implement these m ...

MyBatis - Associated Query When the query content involves multiple tables with association, it is necessary to use association query. According to the relationship between tables and tables, Association queries can be divided into four types: One-to-one Association query One-to-many Association queries Many-to-one Association query Multi-t ...