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Technical Articles

Database

Oracle

How to restart oracle database

Oracle database restart steps: Stop the database: Use the SHUTDOWN IMMEDIATE command. Start the listener: Use the lsnrctl start command. Restart the database: use the STARTUP command.

Apr 19, 2024 am 12:18 AM

oracle

How to check memory usage in oracle database

There are four ways to query the memory usage of Oracle database: use the V$SESSTAT view to query the number of session logical reads; use the V$SGASTAT view to query the usage of each pool in SGA; use the AWR report to query the historical memory allocation and usage summary; Use Oracle Advisor to identify memory usage issues and provide recommendations.

Apr 19, 2024 am 12:15 AM

oracle

How to import oracle database into excel

Excel data can be imported into an Oracle database through the SQLLoader utility or SQL commands. SQLLoader methods include: 1. Prepare data (save as text or CSV file). 2. Create a control file (specify data files, table structure, and load options). 3. Load the data (using the SQL*Loader command). Using SQL commands requires: 1. Create a table (matching data structure). 2. Import the data (using the INSERT INTO statement).

Apr 19, 2024 am 12:12 AM

oracle

How to uninstall the oracle database cleanly

Oracle Database Clean Uninstallation Guide: Stop Oracle Services View Dependencies Uninstall Oracle Main Program Delete Oracle Home Directory Delete Registry Keys Delete Environment Variables Clear Disk Fragmentation Restart Computer

Apr 19, 2024 am 12:06 AM

oracle

How to view the table structure in oracle database

View the structure of a table in an Oracle database using the SQL command DESCRIBE table_name; using the graphical interface of a database tool such as Oracle SQL Developer or Toad.

Apr 19, 2024 am 12:04 AM

oracle

How to start oracle database

The Oracle database startup steps vary depending on the operating system: Linux/UNIX: Log in to the system and execute the oraenv and sqlplus /nolog commands. Windows: Start a command prompt as administrator and execute the oraenv and sqlplus /nolog commands. Verify that the database service is started and that you have the necessary permissions to connect.

Apr 19, 2024 am 12:00 AM

oracle linux

How to create a table in oracle database

The steps to create a table in Oracle database are as follows: Open a database session. Use the CREATE TABLE statement to define the table's name, column names, and data types. Execute the statement and submit it using the COMMIT command. Use the DESC command to verify the creation of the table.

Apr 18, 2024 pm 11:54 PM

oracle

How to recover deleted data in oracle

Deleted data in Oracle can be recovered through the following methods: undo operation, which is suitable for transactions that have not yet been committed; flashback query, which allows viewing the data status at a specified point in time; flashback table, which restores the entire table to a specified point in time; data pump import , requires a previous export backup; manual data repair is complex and time-consuming, requiring professional knowledge.

Apr 18, 2024 pm 11:37 PM

oracle 数据丢失

How to recover accidentally deleted data in oracle

Oracle data recovery methods: 1. Rollback operation: can undo recent deleted changes; 2. Flashback query: view and access data at a certain point in the past; 3. Data pump export/import: can recover accidental deletions from a long time ago Data; 4. Restore backup: Restore data by restoring backup.

Apr 18, 2024 pm 11:33 PM

oracle 数据丢失

How to restore deleted data in oracle database

Deleted data in Oracle can be restored by following these steps: Confirm that the data exists in the Recycle Bin. Verify that you have UNRECOVER TABLE permission. Use the UNRECOVER TABLE statement to restore the data. Optional: Use SCN to specify the specific data version to restore. Execute COMMIT to make it permanent.

Apr 18, 2024 pm 11:27 PM

oracle

How to read Oracle official documents

To view official Oracle documentation, visit https://docs.oracle.com and follow these steps: Enter a keyword or product name in the search bar, or use the menu bar and sidebar to browse documentation categories. Select a specific document type (such as User Guide or API Reference). The document will open in the browser and can be navigated using the navigation menu and search bar. Links in the sidebar allow navigation in different parts of the document, with links at the bottom pointing to related documents. The document can be downloaded in PDF, HTML or EPUB format by clicking the Download button.

Apr 18, 2024 pm 11:09 PM

oracle

Why does the oracle database uninstall software not exist?

Oracle database uninstall software is generally not available separately and can be uninstalled through the control panel, command line, or third-party tools. The uninstallation process is relatively simple, avoiding version conflicts and keeping the environment under control. If you cannot find the uninstall software, try checking your control panel, using a third-party tool, or contact Oracle Support.

Apr 18, 2024 pm 11:07 PM

oracle linux

What should I do if the Oracle database uninstall software does not exist?

Unable to find solution for Oracle uninstall software: Stop all Oracle services. Delete the Oracle installation directory. Delete the HKEY_LOCAL_MACHINE\SOFTWARE\Oracle registry key. Remove Oracle environment variables. Clear temporary files. Restart the computer.

Apr 18, 2024 pm 11:03 PM

oracle

How to view the content of the oracle database listening port

To view the Oracle database listener port, follow these steps: Connect to the database server. To query the listener port, use the SQL statement: SELECT NAME, LISTENER_PORT, DESCRIPTION FROM V$LISTENER WHERE LISTENER_STATUS = 'OPEN'. Look for the "LISTENER_PORT" column, which contains the port number.

Apr 18, 2024 pm 11:00 PM

oracle