Oracle Database is the most popular enterprise-level database, so understanding its troubleshooting solutions is important. Today, let's learn what to do if Oracle Database is unable to write data.
1. Oracle Fails to Start or Database Cannot Start
If the database fails to start, the first step is to check if the system tables are undamaged. Generally, if the system tables are intact, data recovery is relatively straightforward. However, if the system tables are damaged, data recovery personnel will need to manually analyze and verify the table structure, which may lengthen the recovery process. Despite this, the success rate of data recovery remains high, so there is no need to worry excessively about recovery failure.
2. Oracle Database ASM Storage Damage
This issue is usually caused by partial device failures in ASM or database data loss due to ASM resets. After such an event, it is important to determine whether there has been significant data written after the failure. Typically, if no additional data was written after the data loss, recovery is possible. Therefore, it is crucial to avoid writing data to the device as much as possible to prevent further damage to the existing data.
3. Accidental Deletion, Formatting, or Other Data File Loss
If Oracle database data is lost due to accidental formatting, deletion, or other mistakes, do not write any data to the database after the incident. If no data has been written after the loss, data recovery is possible using the database’s organizational rules, regardless of the operating system. The only drawback is that the data file names need to be manually verified by the recovery personnel.
4. Partial Damage to Oracle Data Files and Dump File Damage
If Oracle data files are partially damaged, professional data recovery experts are required to extract and reconstruct the data, which can be time-consuming.
In the case of damaged Oracle dump files, the damaged portions should be removed, and the remaining parts can be normally appended to the data tables.
If data loss is due to software issues, you should avoid excessive operations on the storage and promptly create data backups. If the data loss is due to hardware failure, avoid powering on the hardware to prevent further damage and increased difficulty in recovery.
