Oracle RMAN的维护
RMAN的delete命令delete backupset 102;//删除102号备份集delete noprompt expired backup of tablespace xxwz_data;//无提示删
配置retention(保留)策略
不符合策略的备份集被标记为过期,,可查看可删除。
3种配置
rman>configure retention policy to后面可以加如下的3种方式:
1.recovery window of 7 days;时间窗口
保留恢复从今天开始往前7天的数据所需要保留的备份集
2.redundancy 2;冗余度
保留同一数据文件的2份备份集
3.none:手工
cross checking交叉检查:检查rman备份信息和实际是否同步
rman>list backup;
然后操作系统层面手工删除数据文件的备份集;
再次rman>list backup;依然可以查到已删除的备份集的信息;
rman>delete backupset 47;//删除该备份集时出错,说找不到该备份集。
rman>crosscheck backup;//检查
rman>list backup;//该备份集状态为过期。
obsolete VS expired
obsolete是不符合保留策略的状态,意为not needed。
expired是进行交叉检查时不找到的状态,意为not found。
RMAN的delete命令
delete backupset 102;//删除102号备份集
delete noprompt expired backup of tablespace xxwz_data;//无提示删除表空间的expired备份信息。
delete obsolete;//删除不需要的备份集
//备份时删除原来的备份
backup archivelog all delete input;
backup archivelog sequence between 99 and 199 thread 1 delete input;
修改RMAN的备份状态
rman>change backupset 49 unavailable;
rman>change backupset 49 available;
从保留策略中豁免(即不受保留策略的限制)
rman>change backupset 49 keep forever nologs;//永不限制
rman>change datafilecopy 'd:\copy\xxx.dbf' keep until 'sysdate+60';//不限制60天
catalog(登记)手动备份信息到RMAN存储里(可作为0级备份的基础)
登记数据文件
rman>catalog datafilecopy 'd:\backup\xxwz_data.dbf';
登记归档日志文件
rman>catalog archivelog 'd:\arch\arch_12.arc','d:\arch\arch_13.arc';
rman>catalog start with 'd:\arch' noprompt;//登记这个目录的所有归档日志文件信息
取消登记信息
rman>change backuppiece 51 uncatalog;
rman>change datafilecopy 'd:\backup\xxwz_data.dbf' uncatalog;
rman>change archivelog ... uncatalog

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

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

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



Go language is an efficient, concise and easy-to-learn programming language. It is favored by developers because of its advantages in concurrent programming and network programming. In actual development, database operations are an indispensable part. This article will introduce how to use Go language to implement database addition, deletion, modification and query operations. In Go language, we usually use third-party libraries to operate databases, such as commonly used sql packages, gorm, etc. Here we take the sql package as an example to introduce how to implement the addition, deletion, modification and query operations of the database. Assume we are using a MySQL database.

Apple's latest releases of iOS18, iPadOS18 and macOS Sequoia systems have added an important feature to the Photos application, designed to help users easily recover photos and videos lost or damaged due to various reasons. The new feature introduces an album called "Recovered" in the Tools section of the Photos app that will automatically appear when a user has pictures or videos on their device that are not part of their photo library. The emergence of the "Recovered" album provides a solution for photos and videos lost due to database corruption, the camera application not saving to the photo library correctly, or a third-party application managing the photo library. Users only need a few simple steps

Hibernate polymorphic mapping can map inherited classes to the database and provides the following mapping types: joined-subclass: Create a separate table for the subclass, including all columns of the parent class. table-per-class: Create a separate table for subclasses, containing only subclass-specific columns. union-subclass: similar to joined-subclass, but the parent class table unions all subclass columns.

HTML cannot read the database directly, but it can be achieved through JavaScript and AJAX. The steps include establishing a database connection, sending a query, processing the response, and updating the page. This article provides a practical example of using JavaScript, AJAX and PHP to read data from a MySQL database, showing how to dynamically display query results in an HTML page. This example uses XMLHttpRequest to establish a database connection, send a query and process the response, thereby filling data into page elements and realizing the function of HTML reading the database.

How to use MySQLi to establish a database connection in PHP: Include MySQLi extension (require_once) Create connection function (functionconnect_to_db) Call connection function ($conn=connect_to_db()) Execute query ($result=$conn->query()) Close connection ( $conn->close())

To handle database connection errors in PHP, you can use the following steps: Use mysqli_connect_errno() to obtain the error code. Use mysqli_connect_error() to get the error message. By capturing and logging these error messages, database connection issues can be easily identified and resolved, ensuring the smooth running of your application.

PHP is a back-end programming language widely used in website development. It has powerful database operation functions and is often used to interact with databases such as MySQL. However, due to the complexity of Chinese character encoding, problems often arise when dealing with Chinese garbled characters in the database. This article will introduce the skills and practices of PHP in handling Chinese garbled characters in databases, including common causes of garbled characters, solutions and specific code examples. Common reasons for garbled characters are incorrect database character set settings: the correct character set needs to be selected when creating the database, such as utf8 or u

Through the Go standard library database/sql package, you can connect to remote databases such as MySQL, PostgreSQL or SQLite: create a connection string containing database connection information. Use the sql.Open() function to open a database connection. Perform database operations such as SQL queries and insert operations. Use defer to close the database connection to release resources.
