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Technical Articles

Database

Oracle

How to view tables in oracle database

Methods to view tables in Oracle database include: using the SELECT statement to query the table; using the DESCRIBE command to display the table structure; using the DBMS_METADATA package to obtain column information; using tools such as Toad to view the table structure.

Apr 18, 2024 pm 09:12 PM

oracle

How to read tables in oracle database

There are four ways to view tables in an Oracle database: viewing the table structure and data through SQL statements, using the SQL Developer GUI, using the Toad GUI, and using command-line tools.

Apr 18, 2024 pm 09:06 PM

oracle

How to change the oracle database port

Oracle database port modification guide: Stop the database service; modify the value of PORT in the listener configuration; modify the value of ORACLE_PORT in the database configuration; restart the listener and database; use the netstat command to verify that the port has been changed.

Apr 18, 2024 pm 09:03 PM

oracle

How to modify the oracle database port number

How do I change the Oracle database port number? Stop the database service. Edit the listener configuration file and replace the old port number with the new port number. Edit the database configuration file and replace the old port number with the new port number. Start the database service. Test whether the new port number was changed successfully.

Apr 18, 2024 pm 09:00 PM

oracle

How to check the oracle database port number

The Oracle database port number can be obtained by querying the local_listener parameter in the V$PARAMETER table with SQLPlus. The steps include: access SQLPlus, connect to the database, execute the SQL query, and find the port number.

Apr 18, 2024 pm 08:57 PM

oracle

How to check the oracle database port number

Oracle database port number query method: Use the Oracle listener command to check the listener status and obtain the port number. Use a SQL query to get the listener name. Use the LISTEN command to query the listener configuration and obtain the port number based on the listener name.

Apr 18, 2024 pm 08:54 PM

oracle

How to query the audit function in oracle database

Oracle Database's auditing capabilities track database activity to ensure security. The steps for querying audit capabilities include: Determining the type of activity to be audited. Configure auditing using the AUDIT command. Use the SELECT command to query the audit trail table (for example, dba_audit_trail). Explain the information contained in audit records, such as username, timestamp, and type of operation.

Apr 18, 2024 pm 08:51 PM

oracle

How to query which new tables are added in Oracle database

Summary: There are three methods to query newly added tables in Oracle database: use data dictionary view: query DBA_OBJECTS view and specify time range filtering. Use flashback query: use FLASHBACK_TABLE pseudo table and specify timestamp query. Use log file queries: Parse Oracle redo log files, filtering rows that create tables and add columns.

Apr 18, 2024 pm 08:48 PM

oracle

How to query several tables with the same structure in Oracle database

To query multiple tables with the same structure, you can use the UNION operator to join the SELECT statements for each table, ensuring that the number and type of columns match. Specific steps include: 1. Determine the columns to be queried; 2. Write a UNION query; 3. Execute the query; 4. Optional: Use DISTINCT to eliminate duplicates.

Apr 18, 2024 pm 08:45 PM

oracle

How to query when the oracle database has been modified

Oracle database provides the following methods to query table modification time: LAST_CHANGE pseudo column: Returns the last modified timestamp of any record in the table. USER_TAB_MODIFICATIONS view: Stores information about table structure changes, including last modification time. AUDIT TABLE command: Enables or disables table change auditing and records operation timestamps. FLASHBACK QUERY: Allows you to view data at a specific point in time of the table, but the flashback function needs to be enabled.

Apr 18, 2024 pm 08:42 PM

oracle

How to query non-null data in oracle database

You can query Oracle database for non-null data by filtering the data in the WHERE clause using the NOT NULL condition. Example query: SELECT name FROM employee WHERE name IS NOT NULL;

Apr 18, 2024 pm 08:39 PM

oracle

How to query the creation date of table space in oracle database

To query the creation date of a table space in an Oracle database, you can use the DBA_TABLESPACES view to obtain the table space name and creation date by querying the TABLESPACE_NAME and CREATED columns.

Apr 18, 2024 pm 08:33 PM

oracle

How to query all tables and all data in oracle database

To query all Oracle tables, execute: SELECT table_name FROM user_tables;. To query all data, you need to: 1. Get the table name; 2. Traverse the table and query: SELECT * FROM table_name;.

Apr 18, 2024 pm 08:30 PM

oracle python

How to query all user passwords in oracle database

The encrypted passwords for all users in the Oracle database can be obtained by querying the dba_users table: Establish a connection to the database. Enter query SELECT username, password FROM dba_users;

Apr 18, 2024 pm 08:24 PM

oracle