ORA-01578 Recovery

Recover Data After ORA-01578 Block Corruption

ORA-01578 usually means Oracle found a corrupted data block in a datafile. DBRECOVER reads DBF files directly, so you can check whether table rows outside the damaged blocks are still extractable.

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Common symptom

ORA-01578: ORACLE data block corrupted
ORA-01110: data file 7: '/u01/oradata/users01.dbf'
ORA-26040: Data block was loaded using the NOLOGGING option
                

What To Check First

Do not overwrite the affected datafiles. Work on copies whenever possible, then use the trial to inspect the exact DBF files that contain the affected tables.

Identify the datafile number and path from ORA-01110.
Copy the affected DBF files to a safe recovery workstation.
Run DBRECOVER Examine Records Count on target schemas or tables.
Purchase only if the preview shows useful rows.

When DBRECOVER Helps

DBRECOVER is useful when you need table extraction from damaged datafiles and normal Oracle recovery is blocked, too risky, or unavailable.

Corruption affects some blocks, but many table rows remain readable.
The database cannot be opened cleanly enough for export.
Backups or archived logs are missing.
You need SQL or CSV export from surviving rows.

Test ORA-01578 Recoverability

Download the trial and verify row counts before buying the export license.

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