欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 创建catalog 步骤一:创建恢复目录用户 step1: 为恢复目录单独创建表空间catalog_tbs, 创建恢复目录用户 CREATE USER rcat_user IDENTIFIED BY rcat_password DEFAULT TABLESPACE catalog_tbs; ste
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入
创建catalog
步骤一:创建恢复目录用户
step1: 为恢复目录单独创建表空间catalog_tbs,
创建恢复目录用户 CREATE USER rcat_user IDENTIFIED BY rcat_password DEFAULT TABLESPACE catalog_tbs;
step2: 为恢复目录授予下列角色
connect
resource
recovery_catalog_owner
GRANT connect,resource,recovery_catalog_owner TO rcat_user;
步骤二:创建恢复目录模式对象
step1: 使用RMAN连接的恢复目录
RMAN
catalog=rcat_user/rcat_password
step2: 在RMAN 提示符下执行create catalog命令
create catalog tablespace catalog_tbs;
步骤三:在恢复目录中注册数据库
step1: 使用RMAN 同时连接到数据库和恢复目录
set ORACLE_SID=main_db
RMAN target=backup_admin/backupuserpassword
catalog=rcat_user/rcat_password@recover
step2: 使用恢复目录注册数据库
RMAN>Register database;
rman catalog,撤消目标数据库注册
步骤一:进入要撤消注册的数据库,获取这个数据库的DBID
SQL>select dbid from v$database;
DBID
2539725638
步骤二:连接拥有恢复目录的模式,确定恢复目录中该数据库的DB_KEY
SQL>select db_key from db where db_id=2539725638
DB_KEY
1
步骤三:使用dbms_rcvcat.unregisterdatabase过程从恢复目录中撤消数据库的注册
exec dbms_rcvcat.unregisterdatabase(1,2539725638)

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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