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Database

Oracle

How to back up table data in oracle database

There are three main ways to back up table data in Oracle Database: Use the EXPORT command to export table data to a file. Using the RMAN tool, table-level backup, incremental backup, and parallel backup are supported. Use Oracle Data Pump with advanced features such as parallel processing, transport sets, and schema object metadata export.

Apr 18, 2024 pm 02:48 PM

oracle 数据丢失

How to back up tables in oracle database

Oracle database table backup can be achieved through the following steps: Export table (EXP) Import table (IMP) Other methods include User Data Pump, RMAN Backup and Recovery, and LogMiner. When backing up, you need to pay attention to permissions, database connections, regular backups, backup plans, and safe storage of backup files.

Apr 18, 2024 pm 02:45 PM

oracle 数据丢失

How to recover after deleting data in oracle

Oracle Data Recovery: How to recover after deletion? If data is deleted during a transaction, the data can be recovered through rollback segments. If the flashback region is enabled, data can be recovered through flashback queries. If you back up your database regularly, you can restore the data from the backup.

Apr 18, 2024 pm 02:42 PM

oracle 数据丢失

How to restore oracle delete deletion?

Data deleted using DELETE in Oracle can be recovered from the Recycle Bin. Recovery steps include: 1. Confirm that the data is recoverable; 2. Roll back the transaction; 3. Use flashback query; 4. Use undo table space; 5. Use recovery points. However, you need to pay attention to permissions, overlays, and undo table space restrictions. It is recommended to consult an expert before restoring data.

Apr 18, 2024 pm 02:39 PM

oracle

How to recover accidentally deleted data in oracle database

Steps to recover accidentally deleted data: Check whether there is accidentally deleted data in the Recycle Bin. Use flashback queries to recover accidentally deleted data (for example, if the timestamp is shortly after the accidental deletion). Restore data from backup (if Recycle Bin and Flashback queries cannot be restored).

Apr 18, 2024 pm 02:36 PM

oracle

How to restore after deletion in oracle

To recover deleted Oracle data, you can use the following steps: 1. Confirm that the data has been deleted; 2. Check the backup; 3. Use the flashback tool; 4. Recover from the recycle bin table; 5. Use the Undo table space. Always back up your database, enable flashback functionality and Undo tablespaces, and implement a data recovery plan.

Apr 18, 2024 pm 02:33 PM

oracle 数据丢失

How to recover data deleted by oracle delete

Data deleted by DELETE in Oracle can be recovered through the following methods: Restore from backup: provided that there is the latest backup; use undo table space: undo table space has rollback segment retention enabled; use flashback query: view the data before deletion and Export to a new table; use log mining: parse log files to recover data; use third-party tools: use specialized recovery tools to recover data.

Apr 18, 2024 pm 02:30 PM

oracle 数据丢失

How to recover deleted data in oracle

Steps to recover deleted data in Oracle: Check the Recycle Bin: Check whether the Recycle Bin contains deleted data. Rollback operation: Applicable only to transactional databases, delete operations can be undone. Recovery table area: Used in non-transaction mode or when the recycle bin is not enabled, but only in the case of data corruption or table area damage. Flashback table operation: Create a snapshot of a table at a specific point in time in the past, and retrieve deleted data from the snapshot. Use log file recovery: Use when all else fails and you need to manually record the log file location and identify the transactions to be recovered.

Apr 18, 2024 pm 02:27 PM

oracle

How to recover accidentally deleted data in oracle

Accidentally deleted Oracle data can be recovered using the following methods: Check the Recycle Bin. Use flashback queries to view data for a specific time. Use archive logs for recovery (require archive logs enabled). Contact Oracle Support for advanced recovery options.

Apr 18, 2024 pm 02:24 PM

oracle 数据丢失

How to query stored procedure sql in oracle

To query a stored procedure in Oracle, use the DESCRIBE command, which includes the following steps: 1. Determine the name of the stored procedure; 2. Use the DESCRIBE command; 3. Interpret the results, including parameters, local variables, and SQL code.

Apr 18, 2024 pm 02:15 PM

oracle 作用域

How to recover data deleted by oracle database delete

Deleted data in an Oracle database can be recovered through the following methods: Transaction rollback: Deleted data within a transaction can be restored. Flashback queries: access deleted data at a specific point in time. Flashback tablespace: Create a copy of the database, containing deleted data. Log files: Recover deleted data with professional tools. Third-party tools: Provide more advanced recovery options and automated processes.

Apr 18, 2024 pm 02:12 PM

oracle

How to query data in oracle database

Methods to use SQL to query data in Oracle database: use the "sqlplus" command to connect to the database; execute the "SELECT" statement and specify the columns and tables to be extracted; optional: use "ORDER BY", "LIMIT" and functions to evaluate the results Sort, limit and manipulate.

Apr 07, 2024 pm 05:12 PM

oracle 排列

How to read oracle instance name

View the Oracle instance name by following these steps: 1. Connect to Oracle using SQL*Plus; 2. Run the query: SELECT INSTANCE_NAME FROM V$INSTANCE; 3. The query results will display the name of the current instance.

Apr 07, 2024 pm 05:09 PM

oracle linux

How to query oracle instance name

You can query the Oracle instance name using the following methods: Through SQL Plus: SELECT INSTANCE_NAME FROM V$INSTANCE; Through SQL Developer: View the "Service Properties" tab in the "Connection" node; Through SID Preboot: SELECT INSTANCE_NAME FROM V$INSTANCE; Through tnsnames.ora file; through the Oracle Net configuration file.

Apr 07, 2024 pm 05:06 PM

oracle