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Technical Articles

Database

Oracle

How to write the delete statement in oracle

Oracle's DELETE statement can delete data from the database and follows the following syntax: DELETE FROM table name WHERE condition. The conditional clause specifies the rows to delete, using comparison and logical operators based on column values. Examples include deleting rows with a specific ID, rows with a specific last name, or rows that meet multiple criteria. It should be noted that if there is no WHERE clause, the entire table will be deleted; the deletion operation is irreversible, and it is recommended to back up the data before execution.

Apr 18, 2024 pm 07:15 PM

oracle

How to recover accidentally deleted oracle data

Accidentally deleted data in Oracle can be recovered by following these steps: Identify the tables and rows from which the data was deleted. Recover deleted data by running the RECOVER DATA query. Run a query to confirm that the data has been recovered. Note: If the data has been cleared from the undo segment, it cannot be recovered using this method.

Apr 18, 2024 pm 07:12 PM

oracle 数据丢失

How to recover deleted data in oracle database

Enable Flashback Query and then use a recovery point objective (RPO) or flashback area query table to recover deleted data: 1. Enable Flashback Query to specify how long the database retains data created when a transaction was committed. 2. Use RPO to recover data based on a specific point in time, or use a flashback area query table to query a special table that stores the history of deleted data.

Apr 18, 2024 pm 07:09 PM

oracle

How to recover accidentally deleted oracle database

Accidentally Deleted Data Recovery Guide in Oracle Database: Confirming Accidental Deletion: Check the database logs or backups and try to retrieve the deleted data. Restore data: Restore from backup, if available. Recover from flashback area, if enabled. Use UNDO tablespace recovery if the table has ROW MOVEMENT enabled. Ensure data integrity: Verify data integrity and accuracy, check constraints and run checks. Additional considerations: Ensure access rights, lock tables, back up data, and establish a regular backup schedule to minimize the risk of data loss.

Apr 18, 2024 pm 07:06 PM

oracle 数据丢失

How to recover deleted data in oracle

Recovery methods for deleted data in Oracle include: undoing uncommitted transactions; using the flashback feature to roll back the database and flash back the tables; restoring from backup, which requires restoring the backup and applying logs; and using the RMAN utility to restore the database.

Apr 18, 2024 pm 07:03 PM

oracle 数据丢失

How to recover deleted data in oracle database

Deleted data in the Oracle database can be recovered through the following steps: Check the Recycle Bin: Enter the Recycle Bin to view the deleted data and restore it if it is there. Use Flashback Query: Use the Flashback Query command to restore data when it is not in the Recycle Bin. Use LogMiner tool: Extract deleted data by parsing redo log files.

Apr 18, 2024 pm 06:54 PM

oracle 数据丢失

How to write oracle delete statement

Oracle DELETE statement is used to delete records from the table. The syntax is: DELETE FROM table_name WHERE condition. Conditions are optional to restrict deletion of records. Supports cascade deletion, that is, when deleting parent table records, child table records can also be deleted. Use caution as deletion is irreversible.

Apr 18, 2024 pm 06:52 PM

oracle

How to recover deleted data in oracle

Deleted data in Oracle can be recovered from the recycle bin: 1. Confirm that the data is still in the recycle bin; 2. Use the FLASHBACK TABLE statement to recover the data; 3. Commit the changes to make the recovery permanent. Note: Only data deleted within a transaction can be restored, and the restore operation may result in the loss of other user data.

Apr 18, 2024 pm 06:42 PM

oracle 数据丢失

How to recover accidentally deleted table in oracle

There are two methods to recover accidentally deleted Oracle tables: Use rollback segments: To recover recently deleted tables, the steps include: query rollback segments, create temporary tables, copy data, and delete temporary tables. Using backups: Recover deleted tables that are older or have unavailable rollback segments, including using RMAN, Expdp, or Cold Backup to restore the tables.

Apr 18, 2024 pm 06:39 PM

oracle 数据丢失

How to recover deleted data in oracle

Oracle provides several mechanisms to recover deleted data: Rollback operation: Revert to the state before deletion Restore from backup: Overwrite changes since the backup Flashback query: Query data at a past point in time UNDO tablespace: Recover data through transaction logs Third party Tools: Provides advanced features and user-friendly interface

Apr 18, 2024 pm 06:36 PM

oracle

How to recover accidentally deleted oracle data

Oracle provides a variety of accidental data recovery methods: recovery from the recycle bin (available within 30 days); using flashback query (recovery at a specific point in time); recovery from backup (backup must be timely); using third-party tools (more advanced ). Precautions: Back up regularly, use the recycle bin, enable audit trails, test recovery plans.

Apr 18, 2024 pm 06:33 PM

oracle 数据丢失

How to recover accidentally deleted oracle table data

Oracle provides the following data recovery methods: Rollback segment: For table deletion outside of autocommit mode, use the ROLLBACK command. Flashback query: Query past table versions, requires flashback logging to be enabled, and uses SELECT syntax. Table space point-in-time recovery: Applicable to table spaces with this feature enabled, using standby copies and point-in-time recovery. Restore from backup: Restore the backup and import the restored tables, requiring a backup to be available.

Apr 18, 2024 pm 06:30 PM

oracle 数据丢失

What to do if Oracle accidentally deletes a table

Oracle accidentally deleted tables can be recovered in four steps: 1. Check the recycle bin; 2. Execute a query to restore the table; 3. Submit recovery to make the changes permanent; 4. Check the recovery table to verify data integrity.

Apr 18, 2024 pm 06:27 PM

oracle 数据丢失

How to retrieve deleted table data in oracle

To recover deleted Oracle table data, you can perform the following steps: 1. Check the recycle bin; 2. Determine the object to be recovered; 3. Use the FLASHBACK TABLE command to recover the object; 4. Confirm that the data has been recovered through a query. Note that recovery is only possible immediately after table deletion and if the Recycle Bin is not archived or is full.

Apr 18, 2024 pm 06:24 PM

oracle