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How to create triggers from oracle
A trigger is a database object that automatically executes SQL statements when a specific event occurs. In Oracle, triggers can be created through the CREATE TRIGGER statement that specifies the trigger name, execution time, effect table, trigger event, and SQL statement code. Triggers can be used to perform actions automatically when records are inserted, updated, or deleted. For example, when inserting a new record in the customers table, you can create a trigger to update the last_updated column. Triggers can also use PL/SQL blocks for more complex operations and support a variety of types such as Row, Statement, and System.
Apr 11, 2025 pm 08:54 PM
How to add a listener in oracle
To add an Oracle listener: 1. Create a listener configuration file that contains configuration parameters. 2. Save the configuration file at $ORACLE_HOME/network/admin/listener.ora. 3. Use the lsnrctl start LISTENER command to start the listener. 4. Use the lsnrctl status LISTENER command to verify that the listener is running.
Apr 11, 2025 pm 08:51 PM
How to check oracle vulnerabilities
There are five ways to query Oracle vulnerabilities: Access Oracle Critical Patch Updates (CPU) Websites View Common Vulnerabilities and Exposures (CVE) Database Subscription Oracle Security Alert Check Oracle Software Updates
Apr 11, 2025 pm 08:48 PM
How to import dmp from oracle database
How to import DMP files of Oracle database: Get DMP files; use Oracle Data Pump import utility (impdp); connect to the target database; execute import commands, specify the DMP file path and target schema (optional); wait for the import to complete; verify the import results.
Apr 11, 2025 pm 08:45 PM
How to paginate oracle database
Oracle database paging uses ROWNUM pseudo-columns or FETCH statements to implement: ROWNUM pseudo-columns are used to filter results by row numbers and are suitable for complex queries. The FETCH statement is used to get the specified number of first rows and is suitable for simple queries.
Apr 11, 2025 pm 08:42 PM
How to start oracle service
To start an Oracle service, there are six ways: Use a command prompt: Check the service status and then run the "net start OraServiceSid" command. Using Oracle Service Manager (SRVCTL): Run the "srvctl start OraServiceSid" command. Using Oracle Database Control (DBCA): Expand the Database node, right-click the service and select Start. Using Windows Service Management: Open "Services"
Apr 11, 2025 pm 08:39 PM
How to delete all data from oracle
Deleting all data in Oracle requires the following steps: 1. Establish a connection; 2. Disable foreign key constraints; 3. Delete table data; 4. Submit transactions; 5. Enable foreign key constraints (optional). Be sure to back up the database before execution to prevent data loss.
Apr 11, 2025 pm 08:36 PM
How to stop an instance of Oracle
To close an Oracle instance, follow these steps: Stop all user sessions (using the ALTER SYSTEM KILL SESSION 'all' command). If the shared server is enabled, turn it off (using the ALTER SYSTEM STOP SHARE command). Use the SHUTDOWN NORMAL or SHUTDOWN ABORT command to elegantly close the instance.
Apr 11, 2025 pm 08:33 PM
How to encrypt oracle view
Oracle View Encryption allows you to encrypt data in the view, thereby enhancing the security of sensitive information. The steps include: 1) creating the master encryption key (MEk); 2) creating an encrypted view, specifying the view and MEk to be encrypted; 3) authorizing users to access the encrypted view. How encrypted views work: When a user querys for an encrypted view, Oracle uses MEk to decrypt data, ensuring that only authorized users can access readable data.
Apr 11, 2025 pm 08:30 PM
How to check invalid numbers of oracle
Oracle Invalid numeric errors may be caused by data type mismatch, numeric overflow, data conversion errors, or data corruption. Troubleshooting steps include checking data types, detecting digital overflows, checking data conversions, checking data corruption, and exploring other possible solutions such as configuring the NLS_NUMERIC_CHARACTERS parameter and enabling data verification logging.
Apr 11, 2025 pm 08:27 PM
How to uninstall Oracle installation failed
Uninstall method for Oracle installation failure: Close Oracle service, delete Oracle program files and registry keys, uninstall Oracle environment variables, and restart the computer. If the uninstall fails, you can uninstall manually using the Oracle Universal Uninstall Tool.
Apr 11, 2025 pm 08:24 PM
How to set up users of oracle
To create a user in Oracle, follow these steps: Create a new user using the CREATE USER statement. Grant the necessary permissions using the GRANT statement. Optional: Use the RESOURCE statement to set the quota. Configure other options such as default roles and temporary tablespaces.
Apr 11, 2025 pm 08:21 PM
How to view instance name of oracle
There are three ways to view instance names in Oracle: use the "sqlplus" and "select instance_name from v$instance;" commands on the command line. Use the "show instance_name;" command in SQL*Plus. Check environment variables (ORACLE_SID on Linux) through the operating system's Task Manager, Oracle Enterprise Manager, or through the operating system.
Apr 11, 2025 pm 08:18 PM
How to check tablespace size of oracle
To query the Oracle tablespace size, follow the following steps: Determine the tablespace name by running the query: SELECT tablespace_name FROM dba_tablespaces; Query the tablespace size by running the query: SELECT sum(bytes) AS total_size, sum(bytes_free) AS available_space, sum(bytes) - sum(bytes_free) AS used_space FROM dba_data_files WHERE tablespace_
Apr 11, 2025 pm 08:15 PM
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