NAV: SLTechnology News&Howtos > Database >

• 

  Locks in the database

  The main contents of this paper are as follows: 1 Preface the performance of deadlock and lock should be considered in database large concurrent operation. Seeing that most of the information on the Internet is vague (especially updating the lock), a brief explanation is made here for the convenience of the following description, where T1 is used to execute a request on behalf of a database, T2 represents another request, or T1 can be understood as a

  2022-06-01 16:18:15 Views: 292
• 

  How to optimize the performance of MySQL Database through query

  How to optimize the performance of MySQL database through queries? I believe that many novice rookies have not yet learned this skill. Through the summary of this article, I hope you can learn this skill. The following materials are the steps for implementation. Query is the most commonly used operation in database technology. The process of query operation is relatively simple, first of all from the customer

  2022-06-01 16:18:14 Views: 232
• 

  [MySQL] Database deployment-- MySQL 5.7 (Yum Repository)

  [root@wallet01 ~] # lsb_release-aLSB Version:: base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core

  2022-06-01 16:18:14 Views: 249
• 

  How to solve the problem of Phantom Reading in MySQL

  How to solve the problem of phantom reading in MySQL? I believe that many inexperienced people are at a loss about this, so this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem. 1. MVCC snapshot, save a snapshot of historical data, add and delete data in its transaction

  2022-06-01 16:18:13 Views: 240
• 

  How to set redis Boot self-boot

  How to set redis to boot automatically? I believe that many novice rookies have not yet learned this skill. Through the summary of this article, I hope you can learn this skill. The following materials are the steps for implementation. Use the following method to pay attention to the path to the installation file and the path to the configuration file. [root@loc

  2022-06-01 16:18:13 Views: 292
• 

  Resolve ORA-28000: the account is locked

  In oracle, if ten consecutive attempts to log in are unsuccessful, the account will be lock. When logging in with a locked account, the system reports an error: ORA-28000: the account is locked. Query FAILED_L

  2022-06-01 16:18:12 Views: 279
• 

  The maximum length of varchar in mysql database

  1. Varchar storage rules: below mysql4.0 version, varchar (20) refers to 20 bytes. If you store UTF8 Chinese characters, you can only store 6 (3 bytes each Chinese character) mysql5.0 version or more, varchar (20), which means

  2022-06-01 16:18:12 Views: 294
• 

  How to use the command line to connect to a MySQL database

  Under Windows operating system, start-run, open the "run" dialog box, enter cmd, and click "OK" to enter the DOS window. DOS window enter the login MySQL database command mysql-h 127.0.0.1-u root-p

  2022-06-01 16:18:09 Views: 292
• 

  Installation and configuration tutorial for mysql8.0.20

  MySQL 8.0.20 installation tutorial 1: mysql official website download https://dev.mysql.com/downloads/file/?id=494993 do not need to register, download directly 2: decompress forgive my technical scum, all

  2022-06-01 16:17:54 Views: 233
• 

  Mysqlbinlog extracts the binlog of RDS

  Mysqlbinlog-udevuser-p-hxxx.xxx.xxx.xxx-- read-from-remote-server mysql- if the version of the database derived from the binlog log is the same

  2022-06-01 16:17:50 Views: 232
• 

  12c data pump

  1. Consistent export in OGG synchronized projects, there is always a failure of silent table synchronization that requires table-level initialization. At this time, using the data pump to import and export needs to consider the problem of data consistency. Make sure that the data we export is based on a certain scn or a certain timestamp, so that it can be stopped.

  2022-06-01 16:17:50 Views: 282
• 

  Does the between and in the Mysql data query statement contain boundaries

  In Mysql data query statements, between can be used in sql statements where between and is a MySQL containing boundary values, for example: select * from user where userId

  2022-06-01 16:17:44 Views: 222
• 

  MongoDB connection testing

  The official website http://www.mongodb.org/downloads is based on the premise that both are installed on server2003. 1. After decompressing the file, move the folder to disk C or disk D, name it mongodb, and create the data file.

  2022-06-01 16:17:44 Views: 296
• 

  How to solve the 1064 error of mysql

  Mysql error code 1064 solution: 1. First we enter mysql in command line mode and type mysql-uroot-p. two。 And then access one of the databases. SHOW DATABASES;USE testdb;3.SE

  2022-06-01 16:17:36 Views: 279
• 

  Virtual user Mechanism of vsftpd based on pam_mysql

  1. Virtual user Overview when vsftpd uses virtual users, you need to create a system user for all virtual users, because no matter what type of user vsftpd uses (anonymous user, system user, virtual user), it is ultimately mapped to a user on the operating system, and each

  2022-06-01 16:17:33 Views: 280
• 

  B-tree index of PostgreSQL

  Structured B-tree indexes are suitable for storing sorted data. For this data type, you need to define greater than, greater than or equal to, less than, less than or equal to operators. Typically, B-tree 's index records are stored in data pages. The records in the leaf page contain index data (keys) and refer to

  2022-06-01 16:17:27 Views: 267
• 

  Sqli-labs-master sixth level

  Text documents can be downloaded: link: https://pan.baidu.com/s/1o9c0Hyq password: md9w

  2022-06-01 16:17:24 Views: 234
• 

  Two nodes in the pxc cluster shut down abnormally, and the surviving nodes become non-Primary.

  MariaDB [(none)] > show status like 'wsrep_cluster_status';+--+-+ | Va

  2022-06-01 16:17:12 Views: 208
• 

  Summary of mybatis Learning-initial experience of mybatis

  From the beginning of the work to the present, the ORM framework used is Hibernate. I have heard of ibatis, but I have always seen the specific usage. During the interview some time ago, I found that several companies asked if they could ibatis, so I studied it in the last few days, and then in

  2022-06-01 16:17:12 Views: 228
• 

  Analysis of the principle of error reporting sql injection

  0x00: preface about sql injection, enduring for a long time, now websites generally have relatively enhanced protection against sql injection. In the 2016 * * test report, xss (cross-site scripting * *) and plaintext transmission are the most common, but the use of sql injection is also relatively.

  2022-06-01 16:17:12 Views: 303