高级有关问题,数据库超级难题。
高级问题,数据库超级难题。。。
如何恢复已删除的信息。。
寻找步骤。。。
------解决方案--------------------
难?? binlog
------解决方案--------------------
嗯,有日志的话可以恢复,没有日志就去找专业的恢复公司吧
------解决方案--------------------
嗯,有日志的话可以恢复,没有日志就去找专业的恢复公司吧

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1. Binlog Binlog is used to record write operations (excluding queries) information performed by the database and save it on the disk in binary form. Binlog is the logical log of mysql and is recorded by the server layer. Mysql databases using any storage engine will record binlog logs. Logical log: can be simply understood as a sql statement; physical log: data in MySQL is stored in the data page, and the physical log records changes on the data page; insert the code piece here and the binlog is written by appending Input, you can set the size of each binlog file through the max_binlog_size parameter. When the file size reaches the given value

Preface There are six types of log files in MySQL, namely: redo log (redolog), rollback log (undolog), binary log (binlog), error log (errorlog), slow query log (slowquerylog), general query log (generallog) ), relay log (relaylog). 1. What is redolog? Redolog, also known as redo log file, is used to record changes in transaction operations. It records the value after data modification. It will be recorded regardless of whether the transaction is submitted or not. Redolog files can come in handy when instances and media fail (mediafailure), such as database power outage, Inn

Regarding the MySQL binary log (binlog), we all know that the binary log (binlog) is very important, especially when you need point-to-point disaster recovery, so we need to back it up. Regarding the backup of binary log (binlog), you can first switch the binlog based on the flushlogs method, and then copy & compress it to other storage on the remote server or local server, such as mounted NAS storage. You can also use mysqlbinlog to backup the binlog. Implement local backup or remote backup of MySQL binary log (binlog). Finally, the MySQL binary log (binlog

1. Introduction to Binlog log Binlog is the abbreviation of Binarylog, that is, binary log. Binlog has three main functions: converting random IO into sequential IO during persistence, master-slave replication and data recovery. This article focuses on issues related to master-slave replication. The Binlog log consists of an index file and many log files. Each log file consists of a magic number and an event. Each log file ends with a Rotate type event. For each event, it can be divided into two parts: event header and event body: The structure of the event header is as follows: The structure of the event body includes two parts: fixed size and variable size. For the format of Binlog log, you can have a simple understanding. Interested students can go deeper.

1. Source of the problem When analyzing performance problems, slow queries and binlog slow transactions are commonly used methods. Recently, I was analyzing a slow query and found that it contained a large number of commit statements that were slow, but the matching could not be completed when analyzing the binlog slow transactions. For example, there may be 1,000 commit statements during this period, but there may be only 100 slow transactions. This is too big a difference, so why does this phenomenon occur? 2. The respective determination methods for slow transactions are usually as follows for an explicitly submitted (insert) transaction: GTID_LOG_EVENT and XID_EVENT are the time when the command ‘COMMIT’ is initiated.

Preface During development, it is necessary to monitor the data table by monitoring the binlog log file of mysql. Since mysql is deployed in a docker container, the problem of data volumes also needs to be solved. 1. Open a mysql image through the data volume dockerrun- p3307:3306--namemyMysql-v/usr/docker/mysql/data:/var/lib/mysql-eMYSQL_ROOT_PASSWORD=123456-dmysql:5.7.25 Note: You need to create a file in the host directory in advance to save mysql Data set, the directory I created here is /u

If you want to restore data through mysql's binlog, you must first enable binlog. Set up a test environment here to learn how mysqlbinlog restores the database. The principle is relatively simple. Binlog will store changed data in mysql. For example, if you create a database and write some data, these will be stored in the binlog of mysql. When you need to recover, find two positions, a starting position and an ending position. Half of the ending position is the position before the data was destroyed or deleted. mysql8 has binlogmysql>showvariableslike'%l enabled by default

What is the difference between MySQLbinlog/redolog/undolog? If I want to talk to you about the locking mechanism in InnoDB, it will inevitably involve the MySQL logging system, binlog, redolog, undolog, etc. I saw that these three logs summarized by some friends are not bad, so I quickly brought them to discuss with you. Share with partners. The log is an important part of the MySQL database, recording various status information during the operation of the database. MySQL logs mainly include error logs, query logs, slow query logs, transaction logs, and binary logs. As a developer, what we need to focus on is the binary log (binlog) and transaction log (including redolog and und
