MySQL剔除二进制日志
MySQL删除二进制日志 一、设置日志保留时长expire_logs_days自动删除 ? ? ? ? #查看当前日志保存天数: ?? show?variables?like?‘%expire_logs_days%’;?? #这个默认是0,也就是logs不过期,可通过设置全局的参数,使他临时生效: ?? set?global?expire_logs
MySQL删除二进制日志一、设置日志保留时长expire_logs_days自动删除
? ? ? ?
- #查看当前日志保存天数: ??
- show?variables?like?‘%expire_logs_days%’;??
- #这个默认是0,也就是logs不过期,可通过设置全局的参数,使他临时生效: ??
- set?global?expire_logs_days=7; ??
- #设置了只保留7天BINLOG,?下次重启mysql这个参数默认会失败,所以需在my.cnf中设置 ??
- expire_logs_days?=?7 ?
二、手动删除BINLOG (purge binary logs)
- #用于删除列于在指定的日志或日期之前的日志索引中的所有二进制日志。这些日志也会从记录在日志索引文件 ??
- PURGE?{MASTER?|?BINARY}?LOGS?TO?‘log_name’ ?
- PURGE?{MASTER?|?BINARY}?LOGS?BEFORE?‘date’ ??
- #例如: ??
- PURGE?MASTER?LOGS?TO?‘mysql-bin.010′; ?
- PURGE?MASTER?LOGS?BEFORE?‘2008-06-22?13:00:00′; ?
- PURGE?MASTER?LOGS?BEFORE?DATE_SUB(?NOW(?),?INTERVAL?3?DAY); ?
其它:
- 查看当前日志文件列表:show?binary?logs;?
使用binlog日志的目的是为了方便恢复数据,所以我们不光要会删除,还要会用日志来恢复数据。
使用binlog恢复数据:
使用mysqlbinlog命令恢复日志
- mysqlbinlog?-d?test?/root/mysql/mysql-bin.000001|mysql?-uroot?-ppassword? ?
- ?
- ※附录? ?
- ?
- #1、关于mysqlbinlog在mysql?5.0上的使用方法,可以参考:官方资料? ?
- ?
- #2、如果不知道log-bin存放的文件位置,可以使用下面的命令查看:? ?
- ?
- mysql?-uroot?-ppassword?-e?'SHOW?BINLOG?EVENTS?\G'? ?
- ?
- #3、当只是需要恢复部分记录的时候,你可以使用时间点或位置点来定位,例如:? ?
- ?
- mysqlbinlog?--start-date="2005-04-20?9:01:00"?--stop-date="2005-04-20?10:00:01"?/var/log/mysql/bin.123456|mysql?-uroot?-ppassword[code]? ?
- ?
- #意思是恢复4月20日早上9点到10点这一段时间的数据。? ?
- ?
- mysqlbinlog?--start-position="368301"?--stop-position="368312"/var/log/mysql/bin.123456|?mysql?-uroot?-pmypwd? ?
- ?
- #意思是重做368301到368312位置点之间的操作。(位置点可以就是用mysqlbinlog看到的at?xxx节点)? ?
- ?
- mysqlbinlog?--start-date="2005-04-20?9:55:00"?--stop-date="2005-04-20?10:05:00"?/var/log/mysql/bin.123456?>?/tmp/mysql_restore.sql? ?
- ?
- #同样的,如果我们只是想查看某段时间的操作,直接把它导到一个文件即可。 ?
?

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.

You can open phpMyAdmin through the following steps: 1. Log in to the website control panel; 2. Find and click the phpMyAdmin icon; 3. Enter MySQL credentials; 4. Click "Login".

Create a database using Navicat Premium: Connect to the database server and enter the connection parameters. Right-click on the server and select Create Database. Enter the name of the new database and the specified character set and collation. Connect to the new database and create the table in the Object Browser. Right-click on the table and select Insert Data to insert the data.

You can create a new MySQL connection in Navicat by following the steps: Open the application and select New Connection (Ctrl N). Select "MySQL" as the connection type. Enter the hostname/IP address, port, username, and password. (Optional) Configure advanced options. Save the connection and enter the connection name.

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL and SQL are essential skills for developers. 1.MySQL is an open source relational database management system, and SQL is the standard language used to manage and operate databases. 2.MySQL supports multiple storage engines through efficient data storage and retrieval functions, and SQL completes complex data operations through simple statements. 3. Examples of usage include basic queries and advanced queries, such as filtering and sorting by condition. 4. Common errors include syntax errors and performance issues, which can be optimized by checking SQL statements and using EXPLAIN commands. 5. Performance optimization techniques include using indexes, avoiding full table scanning, optimizing JOIN operations and improving code readability.

Redis uses a single threaded architecture to provide high performance, simplicity, and consistency. It utilizes I/O multiplexing, event loops, non-blocking I/O, and shared memory to improve concurrency, but with limitations of concurrency limitations, single point of failure, and unsuitable for write-intensive workloads.

Recovering deleted rows directly from the database is usually impossible unless there is a backup or transaction rollback mechanism. Key point: Transaction rollback: Execute ROLLBACK before the transaction is committed to recover data. Backup: Regular backup of the database can be used to quickly restore data. Database snapshot: You can create a read-only copy of the database and restore the data after the data is deleted accidentally. Use DELETE statement with caution: Check the conditions carefully to avoid accidentally deleting data. Use the WHERE clause: explicitly specify the data to be deleted. Use the test environment: Test before performing a DELETE operation.
