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Technical Articles

Database

How to view oracle status

The methods to view the status of Oracle database include: using SQL Plus: sqlplus username/password@hostname:port/servicename, and then execute SELECT name, status FROM v$database; using Oracle Enterprise Manager: Expand the "Database" node to view the database status information.

Apr 11, 2025 pm 06:48 PM

oracle

How to query oracle date type

Query Oracle DATE types have the following methods: Equivalent query. Range query, using BETWEEN and AND operators. Greater than/less than query. Function query, use the EXTRACT function to get the date part. BETWEEN SYSDATE query. Advanced queries include date conversion, date addition and time zone conversion.

Apr 11, 2025 pm 06:45 PM

oracle

How to create a view from oracle

Create views in Oracle to provide different perspectives of data without modifying the underlying table. The steps are as follows: 1. Use the CREATE VIEW statement to specify the view name, column name and query; 2. The view column name can be the same as the base table column name, and use AS alias if it is different; 3. The query can contain clauses such as JOIN, WHERE; 4. The creator must have the basic table SELECT permission, and other users must obtain the view SELECT permission. View benefits include: data security, simplified access, logical data modeling, and performance improvements.

Apr 11, 2025 pm 06:42 PM

oracle 敏感数据

How to import data from oracle database

Methods to import data into an Oracle database include: Using the SQL*Loader utility: Create a control file to define data format and load options. Use the SQL*Loader command to perform the import. Use the INSERT statement to insert data line by line.

Apr 11, 2025 pm 06:39 PM

oracle

How to execute SQL using command window in oracle

To execute SQL in the Oracle command window: Open the command window. Connect to the database: connect username/password. Enter the SQL statement and press Enter to execute. View the results. Enter exit to exit the command window.

Apr 11, 2025 pm 06:36 PM

oracle linux macos

Summary of basic knowledge of oracle database

Oracle Database is a reliable, scalable and feature-rich relational database management system (RDBMS). Its architecture follows the client-server model, including server-side components (Oracle Net), instances, shared memory areas (SGAs), background processes, and database files that store data. Basic concepts include tables, rows, columns, primary keys, foreign keys, indexes and cursors. The database is known for its advantages such as high availability, big data support, rich features, strong security and ease of use.

Apr 11, 2025 pm 06:33 PM

oracle 用户权限管理

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