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ORA-01578 and ORA-26040 tips

Oracle Database Tips by Donald BurlesonDecember 21, 2015, updated January 15, 2016

Question: I?m having a block corruption problem.  I have built my indexes in parallel using the NOLOGGING option, and now I get the ORA-26040 error and an indicator that the block is corrupt when I try to validate the index structure:

ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 15, block # 1011707)
ORA-01110: data file 15: 'E:\ORACLE\ORADATA\SDE\RASTER_D2.ORA'
ORA-26040: Data block was loaded using the NOLOGGING option.

AnswerNormally, block corruption is often due to a hardware error, and there is likely a trace file or log entry that was made when it happened.  However, the ORA-26040 error says that the index was loaded using the nologging option and then possibly recovered from a backup taken before the nologging load.
Read these important notes on using the  nologging option.
See these notes on the ORA-26040_data_block_was_loaded_using_the_nologging_option.
For now, just rebuild the index without nologging.  However, that's addressing the symptom, not the cause, and you must learn the root cause of the corruption.

If you did not do a recovery on this index, open an SR IMMEDIATELY and Oracle technical Support. They can use the block editor (BBED) utility to inspect the data blocks and see EXACTLY why they became corrupted. You can also inspect the blocks with BBED yourself.

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