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Technical Articles

Database

How to write oracle trigger

Oracle triggers are database objects that execute business rules or actions when a specific event, such as insertion, update, or delete, occur. Creating a trigger requires the following steps: 1. Create a trigger, specifying the name, event, table, and FOR EACH ROW; 2. Write trigger code, performing verification, recording, calling stored procedures, etc.; 3. Specify the trigger timing (BEFORE, AFTER, or INSTEAD OF); 4. Compile the trigger.

Apr 11, 2025 pm 11:12 PM

oracle

How to view oracle audit log

Viewing audit logs in Oracle allows you to check audit settings to make sure that auditing is enabled. Query the audit log view, such as DBA_AUDIT_TRAIL, to view all audit events. Filter results to find specific events by username, object name, event type, etc. Optimize performance, such as creating indexes, using audit containers, and tuning audit settings to increase query speed and reduce the impact on performance.

Apr 11, 2025 pm 11:09 PM

oracle

How to catch oracle stored procedure exceptions

Oracle stored procedures provide EXCEPTION block for catching exceptions. The steps are as follows: Use EXCEPTION block to specify the exception type: WHEN EXCEPTION_NAME THEN provides processing code: execute exception handling operations Use the WHEN OTHERS clause to handle unspecified exceptions: provide a general processing mechanism

Apr 11, 2025 pm 11:06 PM

oracle

How to create a new user in oracle

Creating a new user in Oracle requires the following steps: Connect to the database. Use the CREATE USER statement to create a user and specify a password. Grants users specific permissions (such as SELECT). Reconnect with new users and test permissions.

Apr 11, 2025 pm 11:03 PM

oracle

How to view all tables in oracle

To view all tables in Oracle, you can use the "SELECT table_name FROM user_tables;" query to get a list of table names owned by the current user. Additionally, you can use the "all_tables" view to view all tables for all users and use the "desc table_name;" command to view details for a specific table.

Apr 11, 2025 pm 11:00 PM

oracle

How to use oracle rank function

The Oracle RANK() function ranks the dataset through the specified sort field and assigns rankings starting from 1. Usage example: sql SELECT employee_id, name, salary, RANK() OVER (ORDER BY salary ASC) AS salary_rank FROM employees;

Apr 11, 2025 pm 10:57 PM

oracle

How to start oracle listener

How to start Oracle Listener? Check the listener status: Use the command lsnrctl status. Start the listener: Use the command lsnrctl start. Verify listener status: Use the command lsnrctl status again.

Apr 11, 2025 pm 10:54 PM

oracle linux

How to open a database in oracle

The steps to open an Oracle database are as follows: Open the Oracle database client and connect to the database server: connect username/password@servername Use the SQLPLUS command to open the database: SQLPLUS

Apr 11, 2025 pm 10:51 PM

oracle

How to view the database name of oracle

The methods to view Oracle database names are: Direct method: use the SELECT statement to query the v$database view. Indirect method: Use tools such as SQL*Plus command line client, Oracle SQL Developer, or Java API to connect to the database.

Apr 11, 2025 pm 10:48 PM

oracle java api

How to compare time in oracle

Two ways to compare time in Oracle: use the comparison operator (=, >, <, etc.); use the BETWEEN operator to check whether the time value is between the specified time value.

Apr 11, 2025 pm 10:45 PM

oracle

How to change the oracle page to Chinese

There are two ways to switch to Chinese in Oracle page: use the language selector to select Chinese (Method 1) or change the database character set to Chinese (Method 2).

Apr 11, 2025 pm 10:42 PM

oracle

How to use oracle backup database

Oracle databases can be backed up by using RMAN, Data Pump, or SQL statements. RMAN is recommended, which provides incremental, concurrent, compressed and encrypted backups. The steps are as follows: 1. Use RMAN to make a backup: Connect to the database, create a backup script, and run it. 2. Use Data Pump for backup: Export the database as SYSDBA. 3. Use SQL statements for backup: Use the BACKUP DATABASE statement as SYSDBA.

Apr 11, 2025 pm 10:39 PM

oracle 数据丢失

How to register an oracle account

Steps to register an Oracle account: 1. Visit the Oracle website; 2. Click "Register"; 3. Select an account type; 4. Fill in the registration form; 5. Agree with the terms and conditions; 6. Complete registration; 7. Verify the email address; 8. Set up security issues; 9. Create a profile; 10. Complete registration.

Apr 11, 2025 pm 10:36 PM

oracle

How to write an oracle creation form

Create a table in Oracle through the following steps: 1. Use the CREATE TABLE statement. 2. Define the table name. 3. Specify the column and its data type and constraints (such as NOT NULL, UNIQUE). 4. Define the primary key (optional). 5. Add constraints (such as foreign keys, check constraints) (optional).

Apr 11, 2025 pm 10:33 PM

oracle