ORA-31004

Error: ORA-31004: Length string of the BLOB in XDB$H_INDEX is below the minimum string

Causa: In the XDB$H_INDEX table, the CHILDREN column, a BLOB, must have a certain minimum length without being chained. The calculated length of the LOB was less than the stated minimum.

Acción: Set the value of the DB_BLOCK_SIZE initialization parameter to at least 2 KB. For XDB to run at its fastest, set DB_BLOCK_SIZE to 8 KB.