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Technical Articles

Database

oracle database port

The default port of Oracle database is 1521 (TCP/IP) for ONS and listening services, and 1522 (TCP/IP) for TNS listeners. To change the port, modify the registry (Windows) or listener.ora file (Linux/Unix). Open the listener port in the firewall to allow the database to receive incoming connections. Check the firewall, database service status, client application port settings or try restarting the service/application to resolve the connection issue.

Apr 11, 2025 pm 06:30 PM

oracle linux windows

oracle database version

There are four common versions of Oracle database: Enterprise, Standard, Standard 2, and Express. Version selection depends on application requirements, data size, performance requirements, and budget. Generally speaking, large enterprises and critical applications use Enterprise Edition, small and medium enterprises and non-critical applications use Standard Edition, requiring higher performance and scalability using Standard Edition 2, and development and testing environments use Express Edition.

Apr 11, 2025 pm 06:27 PM

oracle

Oracle database uninstall tutorial

To uninstall an Oracle database: stop the Oracle service, remove the Oracle instance, delete the Oracle home directory, clear the registry key (Windows only), and delete the environment variables (Windows only). Please back up the data before uninstalling.

Apr 11, 2025 pm 06:24 PM

oracle linux windows

oracle database sysdate

SYSDATE is a function in Oracle that returns the current system date and time, which can be used to store creation dates, comparison dates, and set deadlines. How to use: SELECT SYSDATE FROM dual;. The output can be formatted using the TO_CHAR function. Note that SYSDATE is affected by the server time zone and is avoided in the WHERE clause for performance improvement.

Apr 11, 2025 pm 06:21 PM

oracle yy

What is the difference between Oracle and MySql

Oracle and MySQL are two leading RDBMSs, Oracle is commercial software, and MySQL is open source software. Oracle adopts a multi-process architecture, with better performance, better scalability, but higher cost. MySQL adopts a multi-threaded architecture, which has higher cost performance and more flexible data types, but its high availability and security are not as good as Oracle. Therefore, Oracle is suitable for mission-critical enterprise applications, and MySQL is more suitable for small to medium-sized applications.

Apr 11, 2025 pm 06:18 PM

mysql oracle 区别

Detailed introduction to oracle database

Oracle Database is a relational database management system known for its scalability, reliability and high performance. It is based on a relational model, supports massive data sets, and provides high availability, fast queries and SQL support. Its architecture includes instances, shared memory areas (SGAs) and background processes. It is widely used in e-commerce, finance, healthcare and manufacturing industries, and has advantages such as stability, performance, security, and manageability.

Apr 11, 2025 pm 06:15 PM

oracle

Oracle Database Introduction Tutorial

Oracle Database is a relational database management system known for its reliability, scalability and security. Advantages include: Reliability: High availability and reliability to ensure data security and business continuity. Scalability: Easily scale by adding servers or using technologies such as partitioning and replication. Security: Provides comprehensive security features including access control, encryption and auditing. Performance: Optimized for high load and complex queries. Availability: Provides tools and capabilities to simplify database management and improve availability.

Apr 11, 2025 pm 06:12 PM

oracle 在线课程

What to do if the oracle database password expires

After the Oracle database password expires, you need to take the following steps to restore access: connect to the database server, use SYSDBA identity, create a new password file, edit the password file, set buffering time and forced expiration options; update the spfile; reset the password; restart the database; reconnect the database with a new password.

Apr 11, 2025 pm 06:09 PM

oracle

What does oracle do

Oracle is the world's largest database management system (DBMS) software company. Its main products include the following functions: relational database management system (Oracle database) development tools (Oracle APEX, Oracle Visual Builder) middleware (Oracle WebLogic Server, Oracle SOA Suite) cloud service (Oracle Cloud Infrastructure) analysis and business intelligence (Oracle Analytics Cloud, Oracle Essbase) blockchain (Oracle Blockchain Pla

Apr 11, 2025 pm 06:06 PM

oracle 区块链 ai 敏感数据

The difference between database oracle and mysql

The main differences between Oracle and MySQL are licensing (Oracle is commercial, MySQL is open source), functionality (Oracle provides more advanced features), performance (Oracle is higher), availability (Oracle is higher), security and technical support (Oracle is more comprehensive). Oracle is suitable for enterprise-grade applications, MySQL is suitable for web applications, small and medium-sized enterprises, or on a limited budget.

Apr 11, 2025 pm 06:03 PM

mysql oracle 区别

What are the optimization strategies for Oracle database processes?

Strategies for optimizing Oracle database processes include: monitoring and analyzing process activities; adjusting process priorities; limiting the number of processes; using background processes; optimizing sorting and hashing operations; tuning I/O resources; using connection pools; and periodic cleaning and maintenance.

Apr 11, 2025 pm 06:00 PM

oracle

What is the oracle database security policy

Oracle database security policy is a set of rules to maintain database security, including: Authentication and authorization: Only authorized users are allowed to access the database. Data protection: Encryption, masking and other protection measures to prevent unauthorized access to data. Database object security: Controls access to database objects. Cybersecurity: Protect databases from cyberattacks. System Strengthening: Update patches and implement security audits. Backup and Recovery: Establish a data recovery policy. Safety awareness training: Provide safety awareness training. Continuous monitoring and auditing: Detect suspicious activity and vulnerabilities.

Apr 11, 2025 pm 05:57 PM

oracle

What are the strategies for handling errors in Oracle database?

The strategies for handling Oracle database errors include: checking error messages and obtaining the root cause of the problem; viewing log files to obtain more information; restarting the service or instance to resolve intermittent errors; repairing corrupted data blocks and solving data corruption problems; recompiling invalid objects to solve compile-time errors; analyzing performance problems and optimizing queries; contacting Oracle support department to obtain professional help; refer to online resources to find solutions.

Apr 11, 2025 pm 05:54 PM

oracle

How to achieve efficient data synchronization between Neo4j and PostgreSQL

Efficient data synchronization between Neo4j and PostgreSQL can be achieved through Apache Kafka, Debezium, Neo4j Bolt Connector, Neo4j APOC and other methods. These methods involve the following steps: Using Apache Kafka: utilizing its stream processing platform for real-time data synchronization, Neo4j as the source, and PostgreSQL as the receiver. Use Debezium: Used to capture PostgreSQL changes and convert them to CDC events and use Neo4j Connector to synchronize data to Neo4j. Using Neo4j

Apr 11, 2025 pm 05:51 PM

apache 处理器

Detailed explanation of nested query instances in MySQL database

Nested queries are a way to include another query in one query. They are mainly used to retrieve data that meets complex conditions, associate multiple tables, and calculate summary values or statistical information. Examples include finding employees above average wages, finding orders for a specific category, and calculating the total order volume for each product. When writing nested queries, you need to follow: write subqueries, write their results to outer queries (referenced with alias or AS clauses), and optimize query performance (using indexes).

Apr 11, 2025 pm 05:48 PM

mysql ai