| Oracle Database is one of the most reliable and | | | | Some of the most used methods are: |
| secure RDBMS (Relational Database Management | | | | - DBVerify: You should use this external utility to |
| Systems) from Oracle Corporation. Also, this database | | | | validate the offline and backup data files. |
| is one of the first RDBMSs to allow the capability to | | | | - ANALYZE .. VALIDATE STRUCTURE: This |
| read/write XML statements. The information of the | | | | command is used to check each and every block of |
| Oracle database is stored in a proprietary file called | | | | the scanned object. If any corruption is found in the |
| the DBF (Database File) file, which sometimes get | | | | object, then the detected rows are moved to the |
| corrupt thereby disabling you from using it. But Oracle | | | | INVALID_ROWS table. |
| provides different methods to eradicate database | | | | - DB_BLOCK_CHECKING: Using this method, you can |
| corruption of varying levels. If you are unable to sort | | | | set its parameter to 'TRUE' to check each and every |
| the error even after using these methods, then I would | | | | block of the database object to check if it is |
| suggest you to use third-party Oracle database | | | | self-consistent. This method adds about 1% to 10% |
| recovery software to recover Oracle database. | | | | overhead to the server. So, you should use this |
| Let us have a look at few of the error messages that | | | | method if this much overhead is acceptable to you. |
| you may encounter either while working or while | | | | - DBMS_REPAIR: This tool is actually does two tasks |
| opening an Oracle database | | | | in a go. Unlike the previously discussed methods, it |
| - ORA-01043: user side memory corruption | | | | detects and repairs database corruption on its own. |
| - ORA-01073: fatal connection error: unrecognized call | | | | You would be able to address all the errors after |
| type | | | | performing these methods. However, if this is not so |
| - ORA-01053: user storage address cannot be read | | | | then you should use third-party Oracle database |
| - ORA-01079: Oracle database was not properly | | | | recovery software. These DBF recovery tools are |
| created, operation aborted | | | | very safe to use that do not modify the already |
| Cause: | | | | damaged Oracle database. |
| The most prominent cause of these error messages | | | | The best Oracle database recovery software, which |
| is that the Oracle database has damaged. The | | | | recovers Oracle database created for Oracle 9i, 10g, |
| reasons for the database corruption could be either of | | | | and 11g versions, is Stellar Phoenix Oracle Database |
| the ones mentioned in the introductory paragraph. | | | | Recovery. Compatible with Windows Server 2003 |
| Resolution: | | | | and XP, this DBF recovery utility recovers DBF file by |
| As the error messages may have occurred at | | | | restoring various objects including tables, roles, views, |
| different phases or user actions, there are different | | | | table spaces, cluster tables, schemas, synonyms, |
| type of resolving methods that are provided in Oracle. | | | | indexes, and sequences. |