Oracle Database is a relational database management system, mainly used to store, manage and process data, including: storing and managing large amounts of structured data. Perform data query, update, insert and delete operations. Create complex data models to map real-world entities and relationships. Provide analysis tools for data query and report generation. Supports high-capacity transaction processing to ensure data integrity. Interface with programming languages and supports application development.
Oracle Database: What do you do?
Oracle Database is a relational database management system (RDBMS) that stores, organizes, and manages data. It is known for its scalability, reliability and security.
Main uses:
- Store and manage data: Oracle is used to store large amounts of structured data such as customer information, transaction records, and financial statements.
- Data processing: It provides powerful data processing capabilities, including data query, update, insertion and deletion.
- Data Modeling: Oracle can create complex data models that map real-world entities and relationships into databases.
- Data Analysis: It integrates analysis tools that allow users to query, analyze and generate reports on data.
- Transaction: Oracle supports high-capacity transactions to ensure data integrity and consistency.
- Application Development: It provides an interface to the programming language, allowing developers to build applications using Oracle databases.
Advantages:
- Scalability: Can handle workloads from small databases to super-large databases.
- Reliability: With redundancy and failure recovery mechanisms, ensuring data availability and reliability.
- Security: Provides comprehensive security features to protect data from unauthorized access.
- Performance: Optimized to provide fast data access under high loads.
- Portability: Can run on a variety of platforms, including Windows, Linux, and Unix.
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The development history of Oracle software from database to cloud computing includes: 1. Originated in 1977, it initially focused on relational database management system (RDBMS), and quickly became the first choice for enterprise-level applications; 2. Expand to middleware, development tools and ERP systems to form a complete set of enterprise solutions; 3. Oracle database supports SQL, providing high performance and scalability, suitable for small to large enterprise systems; 4. The rise of cloud computing services further expands Oracle's product line to meet all aspects of enterprise IT needs.

MySQL and Oracle selection should be based on cost, performance, complexity and functional requirements: 1. MySQL is suitable for projects with limited budgets, is simple to install, and is suitable for small to medium-sized applications. 2. Oracle is suitable for large enterprises and performs excellently in handling large-scale data and high concurrent requests, but is costly and complex in configuration.

Oracle helps businesses achieve digital transformation and data management through its products and services. 1) Oracle provides a comprehensive product portfolio, including database management systems, ERP and CRM systems, helping enterprises automate and optimize business processes. 2) Oracle's ERP systems such as E-BusinessSuite and FusionApplications realize end-to-end business process automation, improve efficiency and reduce costs, but have high implementation and maintenance costs. 3) OracleDatabase provides high concurrency and high availability data processing, but has high licensing costs. 4) Performance optimization and best practices include the rational use of indexing and partitioning technology, regular database maintenance and compliance with coding specifications.

Steps to delete the failed database after Oracle failed to build a library: Use sys username to connect to the target instance. Use DROP DATABASE to delete the database. Query v$database to confirm that the database has been deleted.

In Oracle, the FOR LOOP loop can create cursors dynamically. The steps are: 1. Define the cursor type; 2. Create the loop; 3. Create the cursor dynamically; 4. Execute the cursor; 5. Close the cursor. Example: A cursor can be created cycle-by-circuit to display the names and salaries of the top 10 employees.

Oracle views can be exported through the EXP utility: Log in to the Oracle database. Start the EXP utility, specifying the view name and export directory. Enter export parameters, including target mode, file format, and tablespace. Start exporting. Verify the export using the impdp utility.

To stop an Oracle database, perform the following steps: 1. Connect to the database; 2. Shutdown immediately; 3. Shutdown abort completely.

When Oracle log files are full, the following solutions can be adopted: 1) Clean old log files; 2) Increase the log file size; 3) Increase the log file group; 4) Set up automatic log management; 5) Reinitialize the database. Before implementing any solution, it is recommended to back up the database to prevent data loss.


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