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Technical Articles

Database

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

How to modify oracle character set

To modify the Oracle character set, you can follow the following steps: Modify the database character set: ALTER DATABASE CHARACTER SET <New character set>Modify table or column character set: ALTER TABLE <Table name>MODIFY <Column name> <New character set>

Apr 11, 2025 pm 10:30 PM

oracle

How to create triggers for oracle

Triggers in Oracle are SQL code that is automatically executed when a specific event occurs and are used for Data Operation Language (DML) operations (such as inserting, updating, or deleting). The syntax for creating a trigger is: CREATE TRIGGER [trigger name] BEFORE/AFTER [trigger event] ON [table name] AS [trigger code]. Trigger events include: BEFORE INSERT, AFTER INSERT, BEFORE UPDATE, AFTER UPDATE, BEFORE DELETE, AFTER DELETE. The trigger code specifies the SQL statement executed when the trigger event occurs.

Apr 11, 2025 pm 10:27 PM

oracle

How to solve oracle lock table

How to undo Oracle table lock problem: Use a DDL statement to redefine the affected table, but discard uncommitted transactions. Use the UNLOCK statement to release the lock of the session. Terminates a session that causes locking, but can lead to data loss. Use the DBMS_LOCK package to manage locks programmatically, which can be achieved by force release of locks, requesting, or releasing exclusive locks.

Apr 11, 2025 pm 10:24 PM

oracle 数据丢失

How to use oracle index

Oracle index is a database structure that optimizes query performance. It points to data by creating pointers to specific columns in a table. Common types include B-Tree index, hash index, and bitmap index. Indexes speed up queries by narrowing the search range, but you need to consider the query type, table size and data distribution to select the appropriate index. As the data is updated, the index needs to be maintained, and Oracle will automatically maintain most of the indexes, but the bitmap index may require manual reconstruction. Indexes have an impact on performance, including space overhead, update overhead, and affect query plans.

Apr 11, 2025 pm 10:21 PM

oracle